Absolute Neutrophil Count
Also known as: ANC
What Does Absolute Neutrophil Count Measure?
The Absolute Neutrophil Count (ANC) measures the actual number of neutrophils — a specific type of white blood cell — circulating in your bloodstream. Unlike a percentage-based count, ANC gives a precise numerical value, typically expressed as cells per microliter (cells/µL) of blood. Neutrophils are the body's primary defenders against bacterial and fungal infections, and they are the most abundant type of white blood cell in healthy adults. The ANC is usually calculated by multiplying the total white blood cell count by the percentage of neutrophils (including both segmented neutrophils and band cells) reported on a complete blood count (CBC) with differential.
Why Does Absolute Neutrophil Count Matter?
The ANC is one of the most clinically important values in medicine because it directly reflects your body's ability to fight infections. A dangerously low ANC — a condition called neutropenia — leaves patients highly vulnerable to life-threatening bacterial and fungal infections, even from organisms that normally cause no harm. This is especially critical in cancer patients undergoing chemotherapy, bone marrow transplant recipients, and people with certain autoimmune conditions. Conversely, an elevated ANC (neutrophilia) can signal an active infection, inflammation, physical or emotional stress, or in some cases, a bone marrow disorder. Monitoring the ANC helps physicians make key decisions about starting antibiotics, delaying chemotherapy, or initiating protective isolation measures.
Normal Ranges
Males
1,800 – 7,700 cells/µL
Females
1,800 – 7,700 cells/µL
Children
Varies by age; newborns: 6,000–26,000 cells/µL; infants 2–8 weeks: 1,750–8,500 cells/µL; children >1 year: 1,500–8,000 cells/µL
Causes of High Levels
- Bacterial or fungal infections triggering an immune response
- Physical or emotional stress (e.g., intense exercise, trauma, surgery)
- Use of corticosteroid medications such as prednisone
- Smoking, which chronically stimulates neutrophil release
- Chronic inflammatory conditions such as rheumatoid arthritis or inflammatory bowel disease
- Myeloproliferative disorders or chronic myeloid leukemia (CML)
Causes of Low Levels
- Chemotherapy or radiation therapy destroying bone marrow cells
- Viral infections such as influenza, HIV, or hepatitis suppressing bone marrow
- Autoimmune conditions attacking neutrophils (e.g., lupus, Felty syndrome)
How to Improve Your Absolute Neutrophil Count
Diet
- Increase intake of vitamin B12-rich foods such as beef, salmon, eggs, and dairy to support bone marrow function
- Eat folate-rich foods including leafy greens, lentils, and fortified cereals to aid neutrophil production
- Consume copper-containing foods like nuts, seeds, shellfish, and dark chocolate to support white blood cell development
- Include zinc-rich foods such as oysters, pumpkin seeds, and lean meats to enhance immune cell production
- Eat a varied, nutrient-dense diet with adequate protein to support overall bone marrow and immune function
Supplements
- Vitamin B12: 500–1,000 mcg/day if deficient, especially important for vegans and older adults
- Folate (Folic Acid): 400–800 mcg/day to support DNA synthesis in rapidly dividing bone marrow cells
- Copper: 1–2 mg/day if deficiency is confirmed by lab testing
- Zinc: 8–11 mg/day (dietary reference intake) to support immune cell production; avoid excessive doses
- Granulocyte Colony-Stimulating Factor (G-CSF/filgrastim): a prescription injection used medically to rapidly raise ANC in neutropenic patients
Related Biomarkers
Frequently Asked Questions
What ANC level is considered dangerously low?
An ANC below 500 cells/µL is considered severe neutropenia and is a medical emergency because the risk of life-threatening infection is extremely high. An ANC between 500–1,000 cells/µL is moderate neutropenia and still requires close medical monitoring. Many oncologists will delay chemotherapy if the ANC drops below 1,000–1,500 cells/µL, depending on the treatment protocol.
How is ANC calculated from a CBC?
ANC is calculated by multiplying the total White Blood Cell (WBC) count by the combined percentage of segmented neutrophils and band cells reported on the CBC differential. For example, if your WBC is 6,000 cells/µL and 60% are neutrophils (55% segs + 5% bands), your ANC would be 6,000 × 0.60 = 3,600 cells/µL. Many laboratory reports calculate and display this value automatically.
Can a low ANC be temporary and reverse on its own?
Yes, in many cases a low ANC is temporary. Viral infections (like the flu or COVID-19) can temporarily suppress neutrophil production, with counts typically recovering within days to weeks after the illness resolves. Similarly, ANC typically recovers between chemotherapy cycles as the bone marrow regenerates. However, if neutropenia persists or is unexplained, further investigation is needed to identify an underlying cause such as a nutritional deficiency or bone marrow disorder.
What symptoms should I watch for if my ANC is low?
With a low ANC, even minor infections can rapidly become serious. Watch for fever above 100.4°F (38°C), which is a medical emergency in neutropenic patients, as well as chills, shaking, mouth sores, sore throat, pain or burning with urination, unusual redness or swelling around wounds, and shortness of breath. People with known neutropenia should seek immediate medical care at the first sign of fever rather than waiting to see if it resolves on its own.