Chapter 35: Female Genitourinary Problems Assessment

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Welcome back to the Deep Dive.

Today we are putting on our detective hats, and I don't mean that lightly.

We're looking at a system of the body that on the surface seems pretty straightforward.

You gotta go, you go.

Or maybe it hurts when you go.

It feels like simple plumbing.

It definitely feels that way until something goes wrong.

Exactly.

But as we dug into the reading for today, specifically chapter 35 of the advanced health assessment and clinical diagnosis and primary care, it became very, very clear that urinary complaints are not just plumbing issues.

Not at all.

They are a massive web of clues, like a crime scene where the evidence is microscopic, sometimes invisible,

and often really misleading.

It is rarely as simple as just an infection.

It's really a master class in clinical reasoning.

You have patients presenting with this vague discomfort or maybe something alarming like red urine, and your job is to figure out,

is this a minor local issue or is this a sign that a major organ system is failing?

Right.

Is this a bladder infection or is this a structural defect that's been hiding since birth?

Right.

And for this deep dive, we are focusing specifically on the content regarding patients with female genitalia, as well as a significant amount of pediatric content that the text covers.

Because as we'll see, kids are a whole different ballgame.

They really are.

A completely different presentation.

So we're going to act as that curious friend helping you verify you've got the key concepts down.

We're looking at symptom -based assessment, the logic behind the diagnosis, and those red flags you absolutely cannot miss.

And that's the key distinction we need to make right from the start.

We aren't just talking about treating a UTI.

We are talking about distinguishing between an uncomplicated issue, like a simple bladder infection, and red flag systemic involvements that could land a patient in the hospital.

The text is very clear.

Your primary job is to differentiate the annoying from the dangerous.

So our mission today is to walk this chapter chronologically.

We're going to start with the history, which is huge here.

Move to the physical exam,

break down the labs and diagnostics, and finally look at the differential diagnosis.

We want to see how you move from a vague complaint to a concrete conclusion without using outside guidelines.

We are strictly adhering to the text provided in chapter 35.

Which is a great discipline to have.

Stick to the evidence in front of you.

Don't jump to conclusions based on what you think it is.

Let the patient's story guide you.

Okay.

Let's get into it.

So let's unpack the landscape of urinary problems.

When a patient walks in, what are they usually complaining about?

The text breaks it down into the big three.

Right.

So the first category is changes in patterns.

This is the daily rhythm of life, just being totally disrupted.

You have frequency going way too often.

Urgency, that feeling of, I have to go right now or it's going to be a disaster.

I think we've all been there.

Oh yeah.

Then nocturia, waking up at night to go, disrupting sleep, and of course incontinence, which carries a huge social and emotional weight.

Then you have changes in appearance.

Right.

The color, the cloudiness, the visual cues.

And this is often what scares people the most, seeing something that just looks wrong in the bowl.

And the third one, which is usually what brings people in the door,

pain.

The text lists dysuria, which is painful urination,

flank pain on the side, or suprapubic pain right above the pelvic bone.

Those are the symptoms.

That's the what.

But as clinicians, we have to immediately start thinking about the etiology, the usual suspects causing these problems.

The text lists infection, inflammation, calculi, which are stones congenital malformations, and trauma.

Let's talk about infection for a second.

When we talk about urinary tract infections or UTIs, there is one king of the hill, right?

I feel like we always hear about one specific bug.

Absolutely.

Escherichia coli.

E.

coli.

It is the predominant cause of the majority of urinary tract infections.

It's a gram -negative bacteria that usually lives in the bowel.

Why is it always E.

coli?

I mean, there are millions of bacteria out there.

Why is this guy the villain?

Well, it's about opportunity and anatomy.

Because of the proximity of the urethra to the rectum, especially in female anatomy, E.

coli has a very short commute.

And it has these structures called fimbriae, they're like little hairs, that act like grappling hooks.

They physically latch onto the bladder wall so they don't get flushed out when you pee.

That is a terrifying image, grappling hooks.

It's a very effective evolutionary adaptation.

So if you're a betting person, you bet on E.

coli.

But it's not the only player.

The text makes a specific point to connect urinary symptoms to sexually transmitted infections.

Right, because the anatomy is all right next to each other.

Exactly.

We see chlamydia trachomatis, naceria gonorrhea, and herpes simplex as common causes of urethritis.

So if someone has urinary symptoms, burning, discomfort, you can't just have tunnel vision on the bladder.

You have to think bigger.

You have to consider the sexual history.

Is this a UTI or is this an STI presenting as urinary pain?

Now, I want to shift gears to the pediatric context immediately because the text emphasizes this heavily.

I was surprised to read just how common this is in kids.

I usually think of UTIs as an adult woman's problem.

That's a really common misconception.

But the text states it very clearly.

UTI is the second most common clinical disorder in children right after respiratory disorder.

The second.

That is a huge volume of patients.

It is.

I mean, think about how many kids come in with colds and coughs.

UTIs are right behind that.

But here is the challenge.

And the text warns us about this.

Kids don't always say, Mom, my bladder hurts.

No, they almost never do.

Not the little ones.

Exactly.

In children, especially the young ones, the symptoms are vague or just absent.

It might not look like a bladder problem at all.

It might just look like a sick kid.

They might be cranky.

They might have a fever.

They might just be off.

So it's easy to miss.

It makes the diagnosis very easy to overlook if you aren't hunting for it.

You have to have a high index of suspicion.

And when we talk about kids, we also have to talk about structural issues.

Because if a kid gets a UTI, we have to worry about why.

Yes.

Is the plumbing built wrong?

What's the big one the text highlights?

It's a caroteral reflex or VUR.

Okay, let's break that down.

VUR.

So this is the major structural abnormality associated with UTI and, importantly, renal damage in kids.

Normally, the connection between the ureter, that's the tube from the kidney, and the bladder acts like a one -way valve.

Urine goes in, but it can't go back up.

A flap?

Kinda, yeah.

In VUR, that valve fails.

So when the bladder squeezes to pee?

Some of the urine shoots back up the tube toward the kidneys.

It's like a backed up sewer line.

And if that urine is infected, you are basically shooting bacteria directly into the kidney.

That causes scarring.

And scarring in a carry is permanent, right?

Yeah.

That doesn't heal.

No, it's permanent.

It can lead hypertension and even kidney failure later in life.

That's why we care so much about UTIs in kids.

It's not about the discomfort now.

It's about their kidneys in 30 years.

Wow.

Okay, there was also a note about newborns specifically.

If you feel an abdominal mass in a newborn.

It is most frequently renal, specifically a dysplastic kidney, meaning it didn't form right or congenital hydronephrosis.

Hydronephrosis.

That sounds like water kidney.

That's exactly what it is.

Hydro is water.

Nephrosis is a kidney condition.

It's like a water balloon filling up because the exit is blocked somewhere down the line.

So a belly mass in a baby is a kidney issue until proven otherwise.

Okay, so we have the landscape.

We know the bugs.

We know the structural risks.

Now let's get into the detective work.

Section two, diagnostic reasoning and the focused history.

This seems to be the most critical part of the assessment differentiating between this is uncomfortable and this patient is systemically ill.

This is the first fork in the road.

You absolutely have to know if the infection has stayed local in the bladder or if it has traveled upstream to the kidneys.

So what questions are we asking to figure that out?

What are the key things to look for?

You are digging for signs of systemic involvement.

You are asking about fever, chills and body aches.

Okay, let's unpack this.

If a patient says, yeah, it burns when I pee and you ask, do you have a fever?

And they say, yeah, 102 and I'm shaking chills.

What does that tell us?

It tells us we are no longer dealing with a simple bladder infection.

Those flu like symptoms, the fever, chills, body aches, they suggest a systemic inflammatory response.

The body is fighting a war, not a small skirmish.

So it's escalated.

It's escalated.

That means the infection has likely ascended to the kidneys, which is pilonephritis, or maybe they have lathiasis stones in the upper system causing a blockage and an infection behind it.

So just be clear, simple cystitis, a regular bladder infection doesn't usually cause a fever.

Generally, no.

In adults, uncomplicated cystitis is a local irritation.

It hurts to pee.

You have to go all the time, but you don't feel sick in your whole body.

If they have a fever, you have to look higher up the tract.

That is such a crucial distinction.

Fever equals upper tract or systemic involvement.

But what about the kids?

You said their symptoms are vague.

A baby can't tell you they have body aches.

So what is the pediatric tell for systemic illness?

In infants, you aren't looking for them to tell you about back pain.

You are looking for irritability.

Are they just impossible to soothe?

Anorexia.

And that doesn't mean the eating disorder.

It just means they just won't eat.

No appetite.

Zero appetite.

Lethargy.

Are they just lying there, not interested in toys, kind of floppy?

Or failure to thrive.

Failure to thrive sounds serious.

It is.

If an infant is just generally failing to do well, losing weight, dropping off their growth curve, generally just cranky and unhappy, you have to rule out a UTI.

It might be a chronic low -grade infection that's just draining all their energy and preventing growth.

The text also mentions nausea and vomiting.

Right.

Nausea and vomiting often accompany upper UTIs like pyelonephritis or kidney stones.

Why is that?

Why does a kidney problem make you throw up?

It seems disconnected.

It's partly due to the shared nerve pathways.

The kidneys and the gut share some innervation via the celiac ganglion.

So when the kidney is in severe distress, either from infection or the intense pressure of a stone, it triggers that nausea reflex.

It's a sign of a systemic response.

The patient is acutely ill.

And in newborns.

In newborns, vomiting and diarrhea might be the only signs of a UTI.

It's amazing how nonspecific that is.

I mean, a baby with diarrhea could be a virus, could be food intolerance, or it could be a kidney infection.

It is.

And that's why the history is so vital.

You have to put all the little pieces together.

Okay, let's talk about pain patterns.

We mentioned dysuria, but what about flank pain?

The text gives a specific mechanism for why flank pain happens.

It's not just kidney pain.

There's a mechanical reason for it.

It's caused by the stretching of the renal capsule.

The kidney is wrapped in this tight fibrous capsule.

If the kidney swells from infection,

like pyelonephritis or obstruction like a stone, that capsule stretches.

Like trying to overfill a sausage casing.

That's a great analogy.

Exactly.

And that stretch is what causes that deep, dull, aching pain in the back or side.

It's very distinct from muscle pain.

And a radiating pain.

That's usually stones.

If a stone is moving down the ureter, it causes this excruciating sharp pain that often radiates down to the groin or the thigh.

It follows the path of the stone.

Okay, I want to move to what I think is one of the symptoms in the chapter.

Hematuria.

Blood in the urine.

It is a red flag, quite literally.

The text describes it as red to brown discoloration.

And the list of causes is long.

Infection, trauma,

stones, cancer, medications, clotting disorders.

It feels overwhelming.

It's a very broad differential, but we can narrow it down using logic.

First, we distinguish between gross hematuria, which is visible to the naked eye, and microscopic hematuria, which you only see on a lab test.

And gross hematuria seeing blood in the toilet is incredibly alarming for the patient.

It is, and it should be.

It's common in kidney stones and pylonephritis.

But crucially, the text notes that 60 to 90 % of bladder tumors present with gross hematuria.

60 to 90%.

That is a massive statistic.

So if someone sees blood, even if they feel fine otherwise, you have to keep cancer on the radar.

Absolutely.

You cannot dismiss it.

You assume the worst until you prove But there are clues to help us locate the source of the blood based on what it appears in the urine stream.

I found this fascinating.

It's like forensic ballistics, but for P.

Can you break down the timing clues?

Sure.

This is a classic diagnostic trick.

We look at three phases.

Initial, terminal, and total.

Start with initial.

Initial hematuria means the blood is there right at the start of the stream, and then the urine clears up.

So think about the anatomy.

If the blood comes out first, where was it sitting?

It must have been waiting right at the exit.

Exactly.

It suggests the source is the urethra.

The blood was sitting in the urethra, gets flushed out immediately, and then the clean urine from the bladder follows.

Okay, that makes sense.

What about if it's at the end?

Terminal hematuria.

Blood at the end of the stream suggests the posterior urethra, or the base of the bladder, the bladder neck.

Why only at the end?

Because as the bladder finishes emptying, it gives one final squeeze to get the last drops out.

That final contraction can squeeze an irritated area at the bladder neck, pushing out a little blood right at the finish line.

And if it's bloody the whole time.

Total hematuria.

That means the blood is uniformly dispersed throughout the urine.

That implies the blood mixed with the urine before it started coming out.

So we are looking higher up the kidney, the ureter, or a diffuse issue in the

The text draws a hard line between painful and painless hematuria.

This is one of the most important takeaways from this chapter.

If you remember nothing else, remember this.

Painful hematuria blood with burning or cramping is usually infection or stones.

It hurts because there is inflammation or a rock passing through a very small tube.

Okay, that makes sense.

But painless hematuria, that is the scary one.

Because?

Because painless hematuria suggests renal disease or cancer of the bladder or kidney.

A tumor usually doesn't hurt in the early stages, it just bleeds.

So a patient says, I'm peeing blood, but I feel totally fine, no pain at all.

You need to be very, very concerned about malignancy.

That's so counterintuitive, isn't it?

We usually think pain equals bad.

But here, no pain equals potentially worse.

Exactly.

Pain urges you to get help for an infection.

Lack of pain might make a patient seeking care, but it's actually the more ominous sign.

There was one exception to the scary rule, though.

Exercise.

Right.

Transient hematuria can happen after strenuous exercise.

We see this in marathon runners sometimes.

Why does that happen?

Is it just from all the bouncing around?

Partially.

The text mentions it can be direct trauma to the kidneys and bladder from the activity, literally the organs jostling against each other.

But there is also a mechanism called ischemic injury.

Ischemic means lack of blood flow, right?

Yes.

Basically, during intense exercise, the body goes into survival mode.

It says, I need all my blood in my legs to run this race and in my heart and lungs to get oxygen.

I don't really need to filter urine right now, so it shunts blood away from the kidneys.

So the kidneys get starved of oxygen for a bit.

A little bit, yes.

That temporary lack of blood flow ischemia can cause a minor injury to the kidney tissue and the filtration barrier, leading to some blood leaking into the urine.

So if a marathon runner comes in with a little blood in their urine the day after a race,

it might just be physiology.

It might be, but this is a big, but you still have to follow up.

You don't just assume.

You repeat the test after they've rested.

If it's still there, you investigate.

You never ignore hematuria.

Let's move to section four, primary symptoms and the why behind them.

We talked about dysuria, painful urination, but why does it actually hurt?

The text explains the mechanics.

It suggests inflammation and edema swelling, which leads to a loss of bladder elasticity.

Okay, elasticity.

The bladder is supposed to be a stretchy balloon.

Right.

When it's healthy, it expands easily to hold urine, but when it's inflamed, the wall gets stiff and swollen.

It loses that stretchiness, so when it tries to fill or when it contracts to empty, it hurts.

The nerves are hypersensitive.

And then inflammation is also why you get the urgency and frequency.

Exactly.

The bladder is irritable.

It wants to empty, even if there's only a tiny amount of urine because the stretching hurts so much.

The text lists a differential diagnosis for dysuria.

Obviously, number one is cystitis, the uncomplicated lower UTI.

Right.

Bacterial infection of the bladder.

Classic.

But we also have to think about urethritis, especially if there is vaginal discharge present.

Yes.

Urethritis is inflammation of the urethra itself, often from

And vulvovaginitis.

Yes.

And this is distinct.

In vulvovaginitis, the pain is often described as external.

It's not a deep ache.

It burns when the urine hits the inflamed labia or the irritated skin around the opening.

It's a contact burn.

And here's a wild card for the pediatric crowd.

Pinworms?

Yes.

Enterobias firmicularis.

This is a classic aha moment in pediatrics.

How on earth does a worm cause painful urination?

So the female worms come out of the anus at night to lay eggs in the perianal area.

This causes intense itching.

Right.

And young children, they scratch.

That scratching causes these tiny abrasions and inflammation in the periurethral area, the skin right around where they pee.

So when they urinate, the acidic urine stings the scratches.

It presents as dysuria, but the root cause is a parasite.

So you might be treating for UTI, pumping them with antibiotics, but the kid actually has pinworms.

Exactly.

If the urine culture is negative, but the kid is still complaining of pain and itching, you have to check for worms.

And looking for suprapubic discomfort helps distinguish things too.

Right.

Pain right above the pubic bone indicates bladder involvement.

It's that deep, visceral ache of a bladder that is angry and inflamed.

Let's get a little awkward for a second.

Section five, investigating trauma in foreign objects.

The text says we have to ask about trauma, specifically flank injury or straddle injury.

Flank injury, like getting hit with a baseball bat or a hard tackle in football makes us worry about kidney trauma.

The kidney sits right there under the ribs in the back.

Straddle injuries, like falling onto a bicycle crossbar or a fence often cause abrasions and urethral inflammation.

And there is a stat here about injured kidneys that really surprised me.

Yes.

This is really interesting.

About 10 % of injured kidneys actually have underlying abnormality, like a horseshoe shape or hydronephrosis.

Wait, 10%.

That seems really high.

It is.

The logic is that normal kidneys are pretty well protected by the ribs and strong back muscles.

Abnormal kidneys, like a horseshoe kidney, where the two are fused together at the bottom, often sit in a weird position or are larger than normal.

They're just more vulnerable to injury.

So a seemingly minor injury can cause major damage if the kidney wasn't normal to begin with.

Exactly.

And then foreign objects.

The text bluntly states, children have a propensity to put objects in orifices.

They certainly do.

Beads, crayons, bits of toys, toilet paper.

It sounds kind of funny, but it causes real problems.

Oh, it does.

Putting foreign objects in the vagina or urethra causes dysuria and piuria white blood cells in the urine.

It causes a significant inflammatory reaction.

So if you have a child with urinary symptoms, maybe some spotting of blood, but no infection on culture, you have to gently investigate if something might be stuck in there.

We also have to discuss sexual activity.

The text outlines the mechanics of how this contributes to urinary problems in adult women.

It's a combination of friction and bacteria.

Frequent intercourse, sometimes called honeymoon cystitis, can physically traumatize the urethra or using a diaphragm for contraception.

How does a diaphragm cause a UTI?

So the rim of the diaphragm pushes up against the bladder neck.

It can actually compress the urethra.

That compression prevents the bladder from emptying completely.

Ah, so it causes retention.

Exactly.

Urinary retention and stagnant urine is a playground for bacteria.

Anytime urine sets, bacteria grow.

It's a perfect culture medium.

And spermicides.

They can alter the normal vaginal flora.

They might kill off the good bacteria, the lactobacillus that keep the pH acidic.

This makes it easier for E.

coli to colonize the area.

And of course, new partners.

That increases the risk of urethritis from STIs like chromidia.

The text also mentions masturbation.

It can cause local irritation or introduce organisms if hygiene isn't perfect.

It's all about mechanics and exposure.

Moving on to section six, lifestyle, hygiene, and history factors.

This section was a treasure trove of these random but crucial connections.

Let's start with hormones.

Atrophic vaginitis.

This is a huge one for older patients.

When estrogen levels drop like after menopause, the vaginal mucosa and the urethra get thin, pale, and dry.

They lose their natural defense.

This can cause dysuria that mimics an infection perfectly.

But the text includes a very specific and important modern inclusion here.

Yes.

It notes that this is also seen in transgender men on testosterone therapy.

Testosterone suppresses estrogen.

So a trans man might develop atrophic changes due to that hormonal environment.

That is a really key point for inclusivity and assessment.

If a trans man presents with urinary burning, we have to think about atrophy, not just automatically jump to infection.

Absolutely.

The treatment might be topical estrogen, not antibiotics.

What about diet?

Can what we eat make it hard to pee?

Definitely.

We call them bladder irritants.

Spicy foods, caffeine, carbonated drinks, alcohol.

The four food groups of a stressful life.

Pretty much.

And these substances have chemical properties that can irritate the bladder lining directly.

They can cause dysuria and urgency without any infection present.

So if a patient drinks five coffees a day and complains of urgency, the first step might be just to try cutting the coffee.

And hydration.

Or lax thereof.

If you don't drink enough water, your urine becomes very concentrated.

It's dark yellow full of salutes.

And concentrated urine is an irritant.

It's like putting lemon juice on a cut.

Diluting the urine by drinking more water often helps the symptoms a lot.

Now, toilet habits.

The text warns against postponing urination.

Holding it.

We've all done it.

But when urine sits in the bladder for a prolonged period,

it allows any bacteria that are in there to multiply.

You have to flush the system regularly.

And there was a specific maneuver mentioned for children squatting.

Yes.

This is a behavioral clue.

Children who have uninhibited bladder contractions, meaning their bladder tries to squeeze when they don't want it to, will often cross their legs or squat down suddenly.

They're physically trying to hold the door shut.

Exactly.

They are using their heel or their legs to compress the urethra to stop the leak.

But think about the pressure.

You have the bladder squeezing out and the child squeezing in.

That high -pressure situation is a classic setup for vesicretral reflux, VUR.

It forces the urine backwards.

Exactly.

So if a parent says she's always squatting in the corner, that's not just a quirk.

That's a clinical clue for avoiding dysfunction.

Constipation's another big one.

Huge.

The rectum sits right behind the bladder.

A hard mass of stool physically compresses the bladder neck.

It just squishes it.

So the poop blocks the pee.

Basically, it causes retention.

You can't empty your bladder completely because the stool is in the way.

That leads to UTIs.

Often, treating the constipation, getting the bowels moving, is the only way to cure the recurrent UTIs.

And chemical irritants.

Bubble baths.

The classic culprit for children.

Is it the bubbles themselves?

It's the soap.

When you sit in a tub of soapy water, the soap decreases the surface tension of the water, which allows it to enter the urethra more easily.

The chemicals and perfumes in the soap then irritate the delicate lining.

It causes dysuria, often severe, but there's no infection.

So shower, don't soak.

For kids with dysuria, absolutely.

One last history factor that I found fascinating.

Sleep.

Sleep apnea.

It is a common cause of nocturnal and uresus bedwetting, especially in children.

How does snoring cause bedwetting?

What's the connection?

It's complex, but essentially the disrupted sleep patterns and the changes in chest pressure during apneic events affect the hormones that regulate urine production overnight.

Specifically, antidiuretic hormone.

So if a child who was previously dry suddenly starts wetting the bed, you need to ask about their snoring.

And finally, family history.

Alport syndrome.

Yes.

This is a rare one, but a classic board question.

If there is a family history of deafness combined with renal insufficiency or blood in the urine, you have to think Alport syndrome.

It's a hereditary nephritis, a genetic defect in the collagen that makes up the structures in the ears and the kidneys.

Deafness and kidney failure.

That is a very specific connection.

It is.

The body is connected in very surprising ways.

Okay.

We've gathered a massive history.

We asked about sex, poop, sleep, and bubble baths.

Now we have to actually look at the patient, section seven, the physical examination.

And the first thing you look at is their general appearance.

And this goes right back to the pain.

The pacing patient.

Right.

If a patient is pacing the room, unable to sit still, writhing, constantly changing positions, we are thinking kidney stones, urolithiasis, or maybe pylonephritis.

Why do they move so much?

Because the pain is colicky.

It comes in waves.

And it's so intense that they're desperately trying to find a position that relieves it, but nothing works.

They just have to keep moving.

If they are lying perfectly still and appear well, or maybe just a little uncomfortable, it's likely a lower tract problem like cystitis.

Or if they are lying perfectly still because any movement hurts,

that might be peritonitis inflammation of the abdominal lining, but that's a different pathology.

Generally, the pacing patient is the stone patient.

In kids, we are looking for different signs.

Neonates might have jaundice yellow skin.

That can be a sign of sepsis from a UTI.

Toddlers might just have vomiting or diarrhea.

And again, failure to thrive is a major physical sign.

A small, thin child might have chronic renal issues.

Let's talk maneuvers.

The costoprotebral angle, or CVA, this is the classic kidney punch, right?

Gently.

We call it percussion, but yes.

You find the angle between the 12th rib and the spine on the back.

That's where the kidneys sit.

You place your hand flat there and give it a firm thump with your other fist.

What are we looking for?

If that causes reproducible sharp pain, that is positive CVA tenderness.

It is the hallmark physical sign of pilonephritis infection or obstruction.

If the kidney is swollen and inflamed, jarring, it hurts a lot.

If it's just a bladder infection, a thump on the back shouldn't hurt at all.

And that abdominal palpation.

You are feeling for a distended bladder.

A bladder has to be pretty full to feel it above the pubic bone.

If you feel a round, firm mass there, it suggests retention.

They aren't emptying.

You are also feeling for masses like those hydronephrodite kidneys and infants we mentioned before.

And the pelvic exam.

It's essential if you suspect vaginitis or urethritis.

You are looking for discharge.

Is it white, cheesy, green?

You're looking for inflammation.

Lesions like herpes blisters or those signs of atrophy, pale, dry, smooth mucosa that we discussed earlier.

And in kids.

You're looking for signs of trauma or abuse, or sometimes labial adhesions where the labia are stuck together, which can obstruct urine flow.

All right.

We've touched the patient.

Now we need the science.

Section eight, laboratory and diagnostics.

Let's start with the urine specimen itself.

Handling matters.

The text says if you aren't testing the urine within one to two hours, it must be refrigerated.

Why?

Does pee go bad?

It changes.

The cells disintegrate.

If you let it sit out at room temperature, the white blood cells and red blood cells will literally break down.

You might get a false negative just because the sample was sitting on the counter too long.

And bacteria.

Bacteria can multiply in the cup, giving you a false positive for infection.

So cold or fresh.

That's the rule.

Got it.

Now the dipstick.

This is the quick screen we do in the office.

Let's run through the key indicators.

Leukocyte esterase.

This tests for an enzyme that is produced by white blood cells or leukocytes.

If it's positive, it means there are white blood cells in the urine, which indicates inflammation and likely infection.

Is it perfect?

No, it has about 75, 90 % sensitivity.

But beware.

Trichomonas, a protozoan STI, can cause a false positive.

Nitrites.

This one always confused me.

Can you explain this one again?

Sure.

This is all chemistry.

Many bacteria, specifically gram -negative ones like E.

coli, have an enzyme that converts dietary nitrate, which is normally in urine, into nitrite.

So if you see nitrites, you're seeing evidence that bacteria are doing chemistry in the bladder.

Exactly.

It's a very specific sign of bacteriuria.

But there is a catch.

There's always a catch.

Some bugs like staphylococcus and streptococcus, the gram -positives, do not perform this conversion.

They don't have the right enzyme.

So you can have a raging staph UPI and have negative nitrites on the dipstick.

That is huge.

So don't be fooled by a negative nitrite test.

If the patient has symptoms, you have to trust the symptoms.

Correct.

The dipstick is a screen, not a final answer.

Protein.

That indicates renal involvement.

The kidneys are filters.

They're supposed to keep the big stuff like protein in the blood.

If protein is leaking into the urine, the filter is damaged.

And glucose, sugar in the urine.

Usually we think diabetes.

But there is an interesting specific point here.

If the serum, the blood glucose, is normal but the urine glucose is high, it suggests proximal renal tubular damage.

Explain that.

The proximal tubule of the kidney is responsible for reabsorbing sugar back into the blood.

If that part of the tubule is damaged, it fails to grab the sugar and it just spills out into the urine.

It's a sign of kidney tissue damage, not diabetes.

Now let's look under the microscope.

The urinalysis.

We are looking at the visuals.

Colors can tell you a lot.

Milky urine might be precipitated salts or calcium phosphates.

Blue urine, yes.

Blue can be from meds like imitryptaline or certain dyes.

Brown urine, like we said, often means old blood like in glomerulonephritis.

And the sediment.

This is where the detective work gets microscopic.

We are looking for casts.

Casts are fascinating.

They are cylindrical structures that are literally formed in the distal nephron of the kidney.

Why are they called casts?

Think of them like a plaster cast or a jello mold.

The kidney tubule itself is the mold.

Protein and cells get stuck in the tube, they harden into that cylinder shape, and then they get washed out in the urine.

So if you see a cast, you are literally seeing a mold of the inside of the kidney.

That is a great visualization.

So seeing a cast proves the problem is in the kidney.

Exactly.

You don't get cast from the bladder.

It's a definitive sign of renal pathology.

So let's look at the types.

Highline casts.

Those are wispy, translucent, usually benign.

You can see them with just dehydration or exercise.

RBC casts.

Red blood cell casts.

This is a crucial distinction.

If you see a cast that is made of red blood cells, it indicates the blood is coming from the glomerulus, the filter itself.

It means glomerulonephritis or serious kidney disease.

It is not from a bladder infection or a stone.

It is a tissue problem in the kidney.

And WBC casts.

White blood cell casts suggest pilonephritis.

The infection is in the kidney tissue, so the white blood cells are clumping together right there inside the kidney tubules.

So casts equal kidney issues.

That is the rule.

Yes.

Let's define our terms for the record.

When do we officially call it hematuria?

When there are more than three red blood cells per high power field, or HPF, under the microscope.

And piuria, which is pus or white blood cells.

More than five white blood cells per high power field.

The text also distinguishes when we need to do a culture or a CNS.

We don't do it for everyone.

No, not for uncomplicated adult lower UTIs.

If a healthy woman comes in with classic dysuria and frequency and no fever, you treat empirically.

You don't need a culture.

It's almost certainly E.

coli.

But you do culture children, unless it's very straightforward.

You culture anyone with suspected pilonephritis, recurring symptoms or complicated cases, and men.

Men don't usually get simple UTIs, so you almost always culture them.

Finally, imaging.

Ultrasound versus CT.

Ultrasound is non -invasive.

No radiation.

It's the good first test for kids.

The text says it is indicated for any child with a second UTI to check for those structural problems like VUR.

And CT.

A CT scan, specifically a non -contrast helical CT, is the gold standard for kidney stones.

It sees everything.

It has 95 % sensitivity.

If you think it's a stone, you get a CT.

Okay, we have all the data.

We have the history, the exam, the lab results.

Now we bring it home with Section 9.

Differential diagnosis.

The text walks us through specific conditions.

I want to hit these using the clues we've gathered.

First up, uncomplicated UTI or cystitis.

This is your Brynvetter.

Classic presentation.

Adult woman, normal anatomy, dysuria, frequency, urgency, notably no fever.

And there is an evidence -based practice box mentioned here that gives us a probability.

Yes.

It says if you have dysuria and frequency without vaginal discharge, the probability of a UTI is greater than 90%.

That combination is very, very predictive.

You can almost diagnose it over the phone.

Number two, urethritis.

Similar symptoms.

Dysuria, but the history is key here.

New sex partner.

The dipstick might show leukocytes because of the inflammation, but the culture for bacteria might be negative because chlamydia doesn't grow on standard cultures.

So you need a specific STI test.

Exactly.

You have to order the right test.

Number three, vulva vaginitis.

This is the external burn.

You'll find discharge, odor, itching.

The urine hurts the skin, not the tube itself, and the pelvic exam will reveal the inflammation.

Number four, interstitial cystitis.

This seems like a really frustrating one for patients.

It is devastating for some people.

It's the mystery diagnosis.

The patient has frequent painful urination, urgency, maybe even hematuria.

They feel like they have a raging UTI, but the urinalysis is negative.

No bacteria.

So antibiotics don't work.

They don't do anything.

It's a diagnosis of exclusion, usually in middle -aged women.

It involves inflammation and ulceration of the bladder wall itself.

The lining is broken down, but not infected.

Number five, pylonephritis.

The toxic patient.

The one who looks sick.

They have the fever, chills, back pain, nausea, vomiting.

The lab hallmark is those WBC casts or bacterial casts we talked about.

This patient often needs admission to the hospital for IV antibiotics.

Number six, urolithiasis.

Stones.

Can be silent, just sitting in the kidney, doing nothing or agonizing.

When it drops into the ureter, that's the renal colic radiating to the thigh.

The pacing patient.

Hematuria is very common because the stone literally scratches the ureter as it passes.

Number seven, post streptococcal glomerulonephritis.

This is a mouthful.

It is.

This is a specific immune reaction.

The history is the smoking gun here.

The patient, often a child, had a strep throat or a skin infection like impetigo about one to three weeks prior.

And then what happens?

The antibodies the body made to attack the strep bacteria get stuck in the kidney filters, the glomeruli.

Now the patient presents with edema, specifically puffiness around the eyes.

We call it periorbital edema hypertension and T -colored urine.

T -colored.

It's dark because of all the blood and protein leaking through the damaged filters.

And the labs.

You check an ASO titer to prove the past strep infection and you'll find low serum complement, specifically C3, because it's being used up in that immune reaction happening in the kidney.

And finally, number eight, chemical irritation.

The bubble bath kit.

You'll see erythema of the labia.

They have dysuria, but no fever and usually no bacteria in the urine.

The Cura symbol stopped the bubble gats.

So we've traveled from the vague it hurts to identifying RBC casts and diagnosing rare immune responses.

It's a long journey, but it shows how powerful the history and physical are.

You don't need an MRI for most of this.

You need to listen to the patient and look at the P.

So what does this all mean for the listener?

What's the big takeaway?

It means that urinary symptoms are a gateway.

Missing a diagnosis in a childlike VUR can lead to permanent renal scarring and kidney failure later in life.

Missing painless hematuria in an adult could mean missing a curable bladder cancer.

You have to be thorough.

You have to ask the awkward questions.

The history is your most powerful tool.

And I want to leave everyone with one final provocative thought from the text.

We often think of UTIs as just annoying,

but in older adults, the text mentions that UTIs are often mistaken for something else entirely.

Dementia.

In the elderly, a UTI often doesn't present with pain or fever.

Their immune system is different.

It's blunted.

Instead, it presents with confusion, delirium, sudden agitation, or falls.

It really challenges us.

The next time you see a sudden behavioral change in an elderly patient or grandma suddenly seems out of it or forgets who you are.

Don't just assume it's aging or her dementia getting worse.

Are you going to check the urine first?

Always check the urine.

It's the reversible cause you absolutely do not want to miss.

Thanks for diving deep with us.

See you next time.

This episode was brought to you by the Last Minute Lecture Team.