cells/µL
%
%
How it's calculated
ANC = WBC count × (% neutrophils + % bands) / 100, giving the absolute number of mature and immature neutrophils available to fight infection.
Interpretation
| ANC (cells/µL) | Interpretation |
|---|---|
| < 500 | Severe neutropenia — high infection risk |
| 500 – 999 | Moderate neutropenia |
| 1000 – 1499 | Mild neutropenia |
| ≥ 1500 | Normal range |
Clinical use
- An ANC below 500 cells/µL (or below 1000 and expected to fall further) in a febrile patient defines febrile neutropenia — a medical emergency requiring urgent empiric broad-spectrum antibiotics.
- Frequently used to time chemotherapy cycles, decide on growth factor support (e.g. G-CSF), and assess infection risk in oncology and haematology patients.
- Includes both mature (segmented) neutrophils and immature band forms in the total count.
- Trend over time matters as much as the single value — a rapidly falling ANC carries more urgency than a stable low count.
Frequently asked questions
What is the ANC used for?
It quantifies the number of neutrophils available to fight infection, used to assess infection risk, particularly in patients undergoing chemotherapy.
What ANC defines febrile neutropenia?
Generally an ANC below 500 cells/µL (or below 1000 and expected to fall further) combined with fever defines febrile neutropenia, a medical emergency.
Does ANC include band forms?
Yes — the calculation includes both segmented (mature) neutrophils and band (immature) forms from the differential.
Why does ANC matter in chemotherapy patients?
It is used to time chemotherapy cycles, decide on growth factor support, and assess the urgency of any fever or suspected infection.
References
- Freifeld AG, Bow EJ, Sepkowitz KA, et al. Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 update by the IDSA. Clin Infect Dis. 2011;52(4):e56-e93.
- Klastersky J, de Naurois J, Rolston K, et al. Management of febrile neutropaenia: ESMO clinical practice guidelines. Ann Oncol. 2016;27(suppl 5):v111-v118.