Management of Fever with Neutrophilia

Definition and Diagnosis

The presence of neutrophilia (elevated neutrophils at 82%, well above the normal 40-70% range) indicates a different clinical scenario than neutropenia (absolute neutrophil count <0.5 × 10⁹/L), according to the American Society of Clinical Oncology 1
Normal platelet count further confirms that the patient's condition is not a hematologic malignancy or chemotherapy-related complication, as stated by the American Society of Clinical Oncology 1
The relative lymphopenia (9.6%) with neutrophilia suggests an acute bacterial infection or inflammatory process, rather than immunosuppression, as indicated by the American Society of Clinical Oncology 2

The American College of Physicians recommends identifying the source of infection through physical examination targeting common infection sites, such as lungs, urinary tract, skin/soft tissue, abdomen, and indwelling catheters, in patients with fever and neutrophilia 2
The Infectious Diseases Society of America suggests obtaining appropriate cultures (blood, urine, sputum if productive cough) and adjusting antibiotics based on culture results and clinical response, in patients with fever and neutrophilia 2
The American College of Physicians states that the duration of antibiotic therapy depends on the identified infection, typically ranging from 5-14 days for common bacterial infections, in patients with fever and neutrophilia 2
The American Society of Clinical Oncology advises against applying febrile neutropenia protocols to patients with neutrophilia, as this can lead to unnecessary broad-spectrum antibiotics and hospitalization 1, 2
The American College of Physicians recommends that the fever with neutrophilia pattern typically indicates adequate immune response to infection, rather than immunocompromise requiring prophylactic antimicrobials, as stated by the American College of Physicians 3