Neutropenia: Evaluation and Management in the Primary Care Setting

Area of Science:

• Hematology
• Immunology
• Oncology

Background:

• Neutropenia is defined by low absolute neutrophil counts (ANC): <1,500/μL in adults/older children, <1,000/μL in infants.
• It is classified as mild (1,000-1,500/μL), moderate (500-999/μL), or severe (<500/μL), with varied clinical presentations.
• Causes include acquired (autoimmune, drug-induced, infection, malignancy) and inherited (bone marrow failure, congenital) conditions.

Purpose of the Study:

• To define neutropenia and its classifications.
• To outline the diverse causes of acquired and inherited neutropenias.
• To describe treatment strategies and the emergency nature of febrile neutropenia.

Main Methods:

• Review of neutropenia definitions, classifications, and etiologies.
• Summarization of treatment approaches for acquired and inherited neutropenias.
• Definition and management principles for febrile neutropenia.

Main Results:

• Neutropenia severity impacts clinical presentation and management.
• Acquired causes are numerous, including chemotherapy and infections; inherited causes involve genetic factors.
• Febrile neutropenia is an oncologic emergency requiring prompt evaluation and treatment.

Conclusions:

• Neutropenia diagnosis and classification are crucial for guiding treatment.
• Addressing underlying causes is key for acquired neutropenia; granulocyte colony-stimulating factor is often used for severe/inherited forms.
• Prompt recognition and management of febrile neutropenia are critical, with outpatient options for select low-risk patients.