ANC Calculator (Absolute Neutrophil Count)
The Absolute Neutrophil Count tells you how many infection-fighting neutrophils are circulating in your blood. It is one of the most important values for patients undergoing chemotherapy, bone marrow transplant, or dealing with any condition that suppresses the immune system.
The ANC formula: ANC = WBC x (% Neutrophils + % Bands) / 100. Neutrophils are your body's first line of defense against bacterial and fungal infections, so knowing the absolute count (not just the percentage) is critical for clinical decision-making.
A normal ANC is 1,500 cells/µL or higher. Below that threshold, you are considered neutropenic. The severity grading matters because it directly drives treatment decisions:
- Mild neutropenia (1,000-1,500): Usually watched without intervention
- Moderate neutropenia (500-1,000): Increased vigilance; patients should avoid sick contacts
- Severe neutropenia (below 500): Any fever (38°C / 100.4°F or higher) is treated as a medical emergency called febrile neutropenia, requiring blood cultures and empiric broad-spectrum antibiotics within 60 minutes
The most common cause of clinically significant neutropenia is myelosuppressive chemotherapy. Other causes include aplastic anemia, leukemia, severe infections, autoimmune neutropenia, and certain medications. Growth factors like G-CSF (filgrastim) can be used to boost ANC when needed.
Disclaimer: This calculator is for educational reference only. Always discuss lab results with your healthcare team.