Absolute Neutrophil Count - ANC

You should get an ANC test if you have frequent or severe infections, persistent fever, mouth ulcers, or a low white blood cell count on a CBC. It is essential during chemotherapy and for people taking medicines that can lower neutrophils, such as clozapine or certain antithyroid drugs. Fever during chemotherapy needs urgent testing.

No special preparation or fasting is required for an ANC test. Inform your doctor about any chemotherapy schedule, steroids, antibiotics, or other medicines, as they can affect neutrophil counts. Avoid strenuous exercise just before the test. If you are on chemotherapy, follow your doctor’s advice on test timing between cycles.

No, fasting is not required for an ANC test. You can eat and drink normally before giving your sample, and the test can be done at any time of day. If you are receiving chemotherapy, follow your doctor’s advice on test timing, and inform them about any medicines you take.