Complete Blood Count (CBC/FBC)
A blood test that measures different types of blood cells and helps assess anaemia, infection, inflammation and other blood-related conditions.
What the test involves
A complete blood count measures the main types of cells in the blood, including red blood cells, white blood cells and platelets. It commonly reports haemoglobin, haematocrit, red cell indices, white blood cell count and platelet count.
Why it may be requested
A CBC/FBC may be requested when assessing:
- Anaemia
- Suspected infection
- Unexplained fever
- Fatigue or weakness
- Bleeding or bruising
- Suspected blood disorders
- Monitoring certain diseases or treatments
- General assessment when clinically indicated
How to prepare
Usually, no special preparation or fasting is required. Tell the healthcare provider about medicines or supplements you are taking. A blood sample is usually collected from a vein in the arm.
Understanding results
The result is interpreted by looking at the individual blood cell measurements together with the patient's symptoms and clinical history.
Low haemoglobin may suggest anaemia. Changes in the white blood cell count may occur with infections, inflammation, medications and some blood disorders. Abnormal platelet counts may be associated with bleeding or clotting problems.
An abnormal result does not by itself establish a diagnosis. Further assessment or investigations may be needed depending on the pattern of results.
A test result on its own cannot establish a diagnosis.
