Absolute Neutrophil Count (ANC) — Free Online Calculator
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Absolute Neutrophil Count
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About This Calculator
The Absolute Neutrophil Count (ANC) is the actual number of neutrophils (including bands) in the blood. It is the standard measure used to assess the risk of infection in patients receiving chemotherapy, immunosuppressive therapy, or with bone marrow disorders. ANC < 500 cells/μL defines severe neutropenia and carries a high risk of bacterial and fungal infections, often requiring empiric antibiotics for febrile episodes.
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Interpretation
| ANC (cells/μL) | Classification | Infection Risk |
|---|---|---|
| ≥ 1,500 | Normal | Low |
| 1,000 – 1,500 | Mild neutropenia | Slightly increased |
| 500 – 1,000 | Moderate neutropenia | Increased |
| < 500 | Severe neutropenia | High — febrile neutropenia protocol |
References
Frequently Asked Questions
What is febrile neutropenia?
Febrile neutropenia is defined as ANC < 500 cells/μL (or < 1000 expected to decline to <500) with a single oral temperature ≥ 38.3°C (101°F) or sustained temperature ≥ 38.0°C (100.4°F) for one hour. It is a medical emergency requiring prompt blood cultures and empiric broad-spectrum antibiotics.
How quickly can ANC recover after chemotherapy?
ANC nadir typically occurs 7–14 days after chemotherapy, depending on the regimen. Recovery usually begins within 2–3 weeks. G-CSF (filgrastim, pegfilgrastim) can accelerate neutrophil recovery and reduce the duration and severity of neutropenia.
Can ANC be falsely elevated or depressed?
Steroids can cause demargination of neutrophils, elevating ANC without true increase in production. Stress, smoking, and epinephrine have similar effects. Medications like clozapine, chemotherapy, and some antibiotics can suppress ANC. Pseudoneutropenia (benign ethnic neutropenia) is common in people of African descent.
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⚠ Medical Disclaimer
This tool is for educational and informational purposes only. It is not intended to replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional for clinical decisions.