Question 63

Fever occurring several × over at least 3 weeks

Diagnosing Fever of Unknown Origin (FUO) in adults involves identifying fever patterns that persist over a significant duration, specifically several episodes over at least three weeks.

A) Fever occurring several × over at least 3 weeks

This option accurately reflects one of the essential criteria for diagnosing FUO. The definition of FUO encompasses a fever that lasts for an extended period, typically characterized by repeated episodes occurring over three weeks or more without a clear diagnosis.

B) Fever occurring at least once per day for 8 days

While this option describes a fever pattern, it does not meet the strict criteria for FUO diagnosis. The standard definition requires a longer duration of at least three weeks with multiple fever episodes, rather than simply occurring daily for eight days.

C) Body temperature of 100.4 degrees Fahrenheit or greater

Though a temperature of 100.4 degrees Fahrenheit or higher indicates a fever, it is not a criterion for diagnosing FUO. The diagnosis is more focused on the duration and pattern of fever rather than just the temperature threshold.

D) Elevated white blood cell count

An elevated white blood cell count may indicate infection or inflammation, but it is not a diagnostic criterion for FUO itself. FUO is diagnosed primarily based on the fever pattern over time rather than laboratory findings.

Conclusion

The correct answer, "Fever occurring several × over at least 3 weeks," is definitive in diagnosing FUO as it aligns with the established criteria for this condition. Other options either misrepresent the duration required or focus on symptoms and lab findings that do not fulfill the diagnostic requirements for FUO. Understanding the specific criteria is essential for accurate diagnosis and subsequent management.