Fever grades
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fever grades temperature classification low grade moderate high hyperpyrexia medical reference
Fever grades can vary slightly by source and site of measurement. A commonly used clinical classification is:
| Grade | Temperature |
|---|---|
| Normal | 36.5-37.2°C (97.7-99.0°F) |
| Low-grade fever | 37.3-38.0°C (99.1-100.4°F) |
| Moderate-grade fever | 38.1-39.0°C (100.6-102.2°F) |
| High-grade fever | 39.1-41.0°C (102.4-105.8°F) |
| Hyperpyrexia | >41.0°C (>105.8°F) |
A temperature ≥38.0°C (100.4°F) is generally considered fever, depending on how and where it was measured. Temperatures differ by route: rectal readings are usually higher than oral, while axillary readings tend to be lower. NCBI fever reference
Urgent assessment is appropriate for temperature near or above 40°C, or for fever with confusion, breathing difficulty, seizure, stiff neck, severe headache, rash, dehydration, or in an infant younger than 3 months.
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