Which statement best describes the diagnostic criteria for febrile neutropenic fever?

Which statement best describes the diagnostic criteria for febrile neutropenic fever?

• A. Fever ≥38.3°C or sustained ≥38.0°C for ≥1 hr and ANC <1.5 x 10⁹/L
• B. Fever ≥39.0°C with neutrophil count normal
• C. Fever with WBC count above 10 x 10⁹/L
• D. Any fever in the setting of chemotherapy

Answer: (A)

Febrile neutropenia happens when a patient who is immunocompromised from chemotherapy develops a fever and also has neutropenia. The fever part follows standard temperature thresholds: a single oral fever of 38.3°C or a temperature of 38.0°C or higher sustained for about an hour or more. Neutropenia is defined by a low absolute neutrophil count, and in this context the criterion given is an ANC below 1.5 x 10^9/L. Together, fever and ANC below that threshold identify a high risk of infection that requires prompt evaluation and treatment. This option is the best because it combines both required conditions: the fever criteria and the neutropenia threshold. The other statements fail because they either lack neutropenia (fever with a normal neutrophil count), show a non-neutropenic pattern (fever with a high WBC), or describe fever in the setting of chemotherapy without specifying neutropenia, which is essential for the diagnosis.

Febrile neutropenia happens when a patient who is immunocompromised from chemotherapy develops a fever and also has neutropenia. The fever part follows standard temperature thresholds: a single oral fever of 38.3°C or a temperature of 38.0°C or higher sustained for about an hour or more. Neutropenia is defined by a low absolute neutrophil count, and in this context the criterion given is an ANC below 1.5 x 10^9/L. Together, fever and ANC below that threshold identify a high risk of infection that requires prompt evaluation and treatment.

This option is the best because it combines both required conditions: the fever criteria and the neutropenia threshold. The other statements fail because they either lack neutropenia (fever with a normal neutrophil count), show a non-neutropenic pattern (fever with a high WBC), or describe fever in the setting of chemotherapy without specifying neutropenia, which is essential for the diagnosis.