Finding the right tests…
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Finding the right tests…
Haematology
Absolute Neutrophils Count isolates one number from a white cell count: how many neutrophils are circulating per microlitre of blood. Neutrophils are the cells that arrive first when bacteria invade tissue. The number is not counted directly - a lab takes your total white cell count and multiplies it by the neutrophil percentage seen on a differential. This test is ordered by itself, without a fresh full blood count, when someone is on chemotherapy or another drug that can suppress bone marrow, and needs the number checked every few days. A count under 1,000 cells per microlitre is called neutropenia; under 500 is severe neutropenia.
This test reports neutrophils as an absolute count, not a percentage - cells per microlitre, not a share of total white cells. It is calculated from the white blood cell count and the neutrophil percentage from a differential, run on the same blood sample. Because neutrophils are made in bone marrow and have a short lifespan in circulation, the number can shift within days, which is why it gets rechecked often during chemotherapy cycles rather than left to a routine annual test.
Neutrophils are the white blood cells your body sends first to fight bacteria. When the count drops, your defense against everyday bacteria weakens, sometimes with no early warning beyond a fever. Chemotherapy, some viral infections, autoimmune conditions and certain medicines can all lower it.
During cancer treatment, your oncologist does not need every value from a full blood count at each visit - just this one, to decide whether it is safe to give the next chemotherapy dose or whether you need to be careful about infection exposure. Tracking it alone keeps repeat testing faster to act on.
- Deciding if chemotherapy should be delayed - Checking recovery after a bone marrow transplant - Working out infection risk during a fever in someone already known to have a low count - Investigating unexplained, repeated infections
Your doctor reads this number alongside your symptoms and treatment history - a single low reading, by itself, is not treated as an emergency without that context. Ask your doctor what your own result means for your situation.
A typical adult range runs from about 1,500 to 8,000 neutrophils per microlitre of blood, though the exact cutoff can vary by lab and by age. A result under 1,000 is generally called neutropenia, and under 500 is severe neutropenia. Ranges vary by lab, so check the reference range printed on your own report.
Once a full blood count has already flagged a low white cell picture, or someone is already on treatment known to affect the marrow, repeating just this one calculated value is faster and cheaper than a fresh full count every time. It still comes from a standard blood draw.
There is no fixed rule for this specific test. Ask your doctor or the centre when you book, since fasting instructions can depend on whether other tests are being drawn at the same time.
This page is general information about the test, not medical advice. Your own report's reference ranges apply — please discuss your results with your doctor.
A low count raises infection risk in general, but how much depends on how low it is and how long it stays low. Your doctor weighs the number against your symptoms and treatment stage rather than reacting to one reading alone.
No. A low or abnormal neutrophil count can have many causes, from a viral infection to medication effects to a bone marrow disorder. Diagnosing leukemia needs further tests, often including a bone marrow examination.
Several viral infections, some antibiotics and other medicines, autoimmune conditions, and severe nutritional deficiencies can all lower the count for a period. Your doctor will ask about recent illnesses and medicines when reviewing a low result.