Chapter 10: Vital Signs and Laboratory Reference Intervals

Vital signs including temperature, pulse, respirations, blood pressure, and pulse oximetry serve as baseline measurements that help identify changes in client condition, though nurses remain responsible for interpreting these findings even when measurement is delegated to assistive personnel. Temperature assessment requires understanding normal ranges and appropriate measurement sites while recognizing contraindications such as avoiding rectal measurement in cardiac or post-surgical clients. Pulse evaluation extends beyond simple rate counting to include assessment of rhythm, strength, and equality, with apical pulse measurement required for one full minute in clients with irregular rhythms or those receiving cardiac medications. Blood pressure interpretation follows current hypertension staging guidelines, and nurses must understand how cuff size directly affects reading accuracy. Pain assessment represents another vital sign that requires individualized evaluation based on client description and nonverbal indicators, with interventions ranging from nonpharmacological approaches like transcutaneous electrical nerve stimulation to pharmacological management using NSAIDs, acetaminophen, or opioids, each with specific nursing considerations and contraindications. Laboratory reference intervals provide objective data about organ function and therapeutic effectiveness across multiple categories including electrolyte balance, coagulation status, blood cell counts, renal function, and glucose metabolism. Critical nursing actions tied to abnormal values include monitoring for cardiac dysrhythmias with potassium abnormalities, initiating bleeding precautions based on coagulation study thresholds, recognizing left shift patterns in white blood cell counts as indicators of infection, and understanding that hemoglobin A1c reflects long-term glucose control. The chapter emphasizes that interpretation of these values requires not only knowledge of normal ranges but also understanding the clinical significance of abnormalities and their implications for nursing interventions and client safety.