First, a definition. Before you can officially “diagnose” someone with FUO, you have to meet a few criteria. The original criteria (back in 1961) were:
- A fever of 101º F or more on several occasions
- …persisting for over three weeks
- …with no diagnosis despite a week-long, in-hospital investigation.
What causes fever of unknown origin?
Source: Pathology Student
Image credits: Bionuclear
Art and Science of Laboratory Medicine