- Defined as temperature ≥38°C (100.4°F).
- Peripheral temperature is not clinically accurate and central measurements are the preferred means of determining fever.
- Fever directly causes an increase in:
- Heart rate: 10 beats per minute per degree centigrade
- Respiratory rate
DDx by Heart Rate
Every 0.55°C increase in temperature should → increase HR by ~10BPM
- If patient has relative bradycardia, consider:
- If patient has frank bradycardia, consider:
See individual notes for specific workup:
- Fever and Rash
- Fever of Unknown Origin
- Neutropenic Fever
- AIDS Fever of Unknown Origin
- Heat Emergencies
- Fever in Traveler
- Depends on underlying etiology
- Pediatric fever of uncertain source
- Fever and rash
- Fever of unknown origin
- Neutropenic fever
- AIDS fever of unknown origin
- Environmental heat diagnoses
- Fever in traveler
- Niven DJ, Gaudet JE, Laupland KB, Mrklas KJ, Roberts DJ, Stelfox HT. Accuracy of Peripheral Thermometers for Estimating Temperature: A Systematic Review and Meta-analysis. Ann Intern Med. 2015;163(10):768-777. doi:10.7326/M15-1150.
- Davies P, Maconochie I. The relationship between body temperature, heart rate and respiratory rate in children. Emerg Med J. 2009 Sep;26(9):641-3. doi: 10.1136/emj.2008.061598.