Overview
A CBC measures several types of blood cells and related features. It is often part of a routine check-up or used alongside other information when someone has symptoms.
Why the test is used
A healthcare professional may use a CBC to look for patterns such as anaemia, infection, inflammation or changes in blood cells. A result is interpreted in context, rather than on its own.
What the test measures
The report commonly includes red blood cells, haemoglobin, haematocrit, white blood cells and platelets. Different laboratories may use slightly different reference ranges.
Understanding the results
A result outside a reference range does not automatically mean something is wrong. Recent illness, medicines, hydration, age and other factors can influence results.
High or low results
High or low values can have many possible explanations. Your healthcare professional can explain which patterns matter and whether a repeat test or further assessment is appropriate.
Questions to ask your healthcare professional
Ask what the result means for you, whether it fits with your symptoms and whether you need another test or follow-up. Bring a list of medicines and supplements if relevant.
Sources and medical disclaimer
Educational reference points include NHS and MedlinePlus patient information. Clinical Health Hub provides education only and is not a substitute for professional medical advice.
This page uses the linked references below for general educational context.
- Complete Blood Count (CBC) — MedlinePlus Medical Test
This page is not a substitute for professional medical advice, diagnosis or treatment. Contact an appropriately qualified healthcare professional with personal questions.