Vital signs
Body Temperature
LOINC 8310-5 · °C
Ranges
Reference range: 36.1–37.2 °C
What it is
Body temperature reflects the balance of heat your body produces and loses. Normal is around 37 °C (98.6 °F), varying by person and time of day.
Why it matters
It is a basic vital sign and a common early indicator of infection or illness.
What high values can mean
A higher value (fever) usually signals that the body is fighting an infection or other illness.
What low values can mean
A lower value can occur with cold exposure or, if very low, can be a medical emergency (hypothermia).
How to improve it
Temperature reflects your current state; for a fever, rest, fluids and treating the cause are what help.
Food & lifestyle
No specific food changes temperature; staying hydrated and resting support recovery from a fever.
Preparing for the test
Measure at rest with a reliable thermometer; method (oral, ear, forehead) affects the reading.
When to talk to a doctor
Seek care for a high or persistent fever, or any very low temperature, especially with other symptoms.
Related markers
Sources
- MedlinePlus (NIH)
- Mayo Clinic
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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