ABSOLUTE NEUTROPHIL COUNT (ANC)

The Absolute Neutrophil Count (ANC) test is a blood test that measures the total number of neutrophils present in the bloodstream. Neutrophils are the most abundant type of white blood cell and serve as the body's first line of defense against bacterial, fungal, and other infections.

The ANC is calculated using the total white blood cell count and the percentage of neutrophils (including mature neutrophils and band cells) reported in a Complete Blood Count (CBC). It provides a more accurate assessment of infection-fighting capacity than the neutrophil percentage alone.

This test is commonly used to evaluate immune system function, identify infection risk, monitor patients receiving chemotherapy, and assess conditions affecting bone marrow production. A low ANC, known as neutropenia, increases the risk of infections and may require medical attention.

Benefits of the Test

• Assesses the body's ability to fight infections
• Helps identify neutropenia and infection risk
• Supports monitoring during chemotherapy
• Evaluates bone marrow function
• Assists in diagnosing hematological and immune disorders

Why Doctors Recommend This Test

Doctors may recommend the ANC test when patients have:

• Frequent or recurrent infections
• Fever of unknown origin
• Abnormal Complete Blood Count (CBC) results
• Suspected bone marrow disorders
• Ongoing chemotherapy or radiation therapy
• Autoimmune or immune deficiency disorders

The ANC is especially important in cancer patients because chemotherapy can temporarily reduce neutrophil levels, increasing susceptibility to infections.

Preparation Before Test

The ANC test requires a simple blood sample.

• No fasting is usually required
• Continue medications unless instructed otherwise
• Inform your doctor about any recent infections or treatments
• Follow laboratory-specific instructions if provided

The test is quick, minimally invasive, and performed using a standard blood sample.

Normal Reporting Time

Results are typically available within 24 hours of blood collection, depending on laboratory processing schedules.

Who Should Take This Test?

• Patients receiving chemotherapy
• Individuals with recurrent infections
• People with abnormal CBC results
• Patients with suspected immune disorders
• Individuals with bone marrow diseases
• Patients undergoing hematology evaluation

The ANC test is one of the most important hematology investigations for evaluating infection risk and monitoring immune system health.

Clinical Significance

High ANC (Neutrophilia) may be associated with:

• Bacterial infections
• Inflammation
• Physical stress
• Trauma or surgery
• Smoking
• Certain blood disorders
• Corticosteroid therapy

Low ANC (Neutropenia) may be associated with:

• Chemotherapy-induced bone marrow suppression
• Viral infections
• Autoimmune disorders
• Bone marrow diseases
• Vitamin deficiencies
• Certain medications
• Severe systemic infections

Common ANC Categories:

• Normal: Above 1,500 cells/µL
• Mild Neutropenia: 1,000–1,500 cells/µL
• Moderate Neutropenia: 500–1,000 cells/µL
• Severe Neutropenia: Below 500 cells/µL