Vital Signs: Measurement, Interpretation and Nursing Priorities

Vital signs are most useful when interpreted as trends rather than isolated numbers. Nursing students should understand both correct measurement technique and the clinical meaning of change.

Temperature

Temperature varies with site, age, activity, circadian rhythm, environment, and illness. Record the route used because oral, tympanic, axillary, rectal, and temporal values are not identical.

Pulse

Assess rate, rhythm, and strength. A pulse should be interpreted with symptoms, medications, hydration, temperature, activity, and cardiovascular condition.

Respirations

Observe rate, rhythm, depth, and effort. Do not rely only on respiratory rate; increased work of breathing, cyanosis, altered mental status, or falling oxygen saturation may indicate deterioration.

Blood Pressure

Use an appropriately sized cuff and correct positioning. Compare readings with baseline and symptoms. Sudden hypotension with dizziness, altered consciousness, bleeding, or signs of poor perfusion requires urgent review.

Oxygen Saturation

Pulse oximetry estimates peripheral oxygen saturation but can be affected by poor perfusion, motion, nail products, probe placement, and device limitations. Always interpret SpO2 with the patient’s clinical condition.

Pain

Pain is commonly assessed alongside vital signs. Use an appropriate scale and assess location, quality, severity, timing, aggravating factors, relieving factors, and impact on function.

Trend Recognition

A pattern of gradual deterioration can be more important than a single abnormal result. Recheck unexpected readings, look for related symptoms, compare with previous values, and escalate according to local early-warning or clinical-response systems.