Health Questions and Answers

Question: What is an FUO?


No, not an UFO, an FUO. FUO, or fever of unknown origin, is defined as a fever greater than 38.3°C (100.9°F), documented on several occasions during a period longer than 3 weeks, with an uncertain diagnosis after l week of evaluation in the hospital. If the patient presents for an initial evaluation of a fever, it is not an FUO. The most common causes of FUO are occult infection and malignancy, each accounting for approximately 30% of cases.

Reference: Baraff LJ: Fever without a source in infants and children. Ann Emerg Med Dec 36:6, 2000.

2 Responses to “Question: What is an FUO?”

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