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Vital signs

Definition

Vital signs reflect essential body functions, including your heartbeat, breathing rate, temperature, and blood pressure. Your health care provider may measure, or monitor your vital signs to check your level of physical functioning.

Normal vital signs change with age, sex, weight, exercise capability, and overall health.

Normal vital sign ranges for the average healthy adult while resting are:

  • Blood pressure: between 90/60 mmHg and 120/80 mmHg
  • Breathing: 12 to 18 breaths per minute
  • Pulse: 60 to 100 beats per minute
  • Temperature: 97.8掳F to 99.1掳F (36.5掳C to 37.3掳C); average 98.6掳F (37掳C)

Gallery

Wrist pulse
To measure the pulse at the wrist, place the index and middle finger over the underside of the opposite wrist, below the base of the thumb. Press firmly with flat fingers until you feel the pulse in the radial artery.
Thermometer temperature
Fever is an important part of the body's defense against infection. Most bacteria and viruses that cause infections in humans thrive best at 98.6 degrees F (37 degrees C). Raising the body temperature a few degrees can help the body fight the infection. In addition, a fever activates the body's immune system to make more white blood cells, antibodies, and other infection-fighting agents.
Taking your carotid pulse
The carotid arteries take oxygenated blood from the heart to the brain. The pulse from the carotids may be felt on either side of thefront of the neck just below the angle of the jaw. This rhythmic beat is caused by varying volumes of blood being pushed out of the heart toward the extremities.

References

Ball JW, Dains JE, Flynn JA, Solomon BS, Stewart RW. Vital signs and pain assessment. In: Ball JW, Dains JE, Flynn JA, Solomon BS, Stewart RW, eds. Seidel's Guide to Physical Examination. 10th ed. St Louis, MO: Elsevier; 2023:chap 6.

Simel DL. Approach to the patient: history and physical examination. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 6.

Last reviewed February 2, 2023 by Linda J. Vorvick, MD, Clinical Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team..

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