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A fever of unknown origin (FUO) is a fever of at least 101 degrees Fahrenheit (38.3 degrees Celsius) that either lasts for more than three weeks or occurs frequently without explanation. Even though a doctor cannot initially determine the cause of the fever, a diagnosis of FUO is a step toward finding a cure.
There are four classifications of FUO: classic, nosocomial, immune-deficient, and HIV-associated.
FUO has four primary types of causes. Recognizing the type of FUO helps a physician determine its cause. Each type of cause includes multiple conditions.
A patient with a FUO will be given a variety of clinical tests to narrow down the FUO’s classification. Diagnosis of the FUO can be useful in drawing attention to an otherwise undiagnosed condition.
Treatment for a FUO varies greatly and depends on the underlying cause. In about 30 percent of cases, the patient is discharged without a definitive diagnosis. In many such cases, FUO resolves itself in time.
Written by: Maureen Ash and Ana Gotter
Published on: Aug 27, 2013on: Nov 02, 2016
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