vital signs

Vital signs are the handful of quick, basic measurements that tell a clinician how a person's body is doing at this moment — a fast snapshot of the machinery keeping you alive. They are usually the very first things checked in any clinic, ward or emergency.

The classic set is heart rate (beats per minute), blood pressure, breathing rate and body temperature, with oxygen saturation now routinely added as a fifth. Several of these are directly cardiovascular: the heart rate and blood pressure report on the pump and the pressure in the pipes, and a low oxygen level can flag failing circulation or lungs.

Vital signs are valued because they are simple, fast and informative. A single reading means little in isolation — a racing pulse can be exercise or fear — but a pattern, or a change over time, can be the earliest warning of deterioration. Normal ranges vary with age, fitness and situation, so they are always read in context.