Mean Cell Volume Test
This blood test provides insight into the average size of your red blood cells, helping to support the diagnosis of different types of anaemia.
What is a Mean Cell Volume test?
The Mean Cell Volume (MCV) test is part of a standard full blood count. It measures the average volume of red blood cells, which carry oxygen around your body. By identifying whether your red blood cells are smaller or larger than normal, the MCV test can help point towards nutritional deficiencies, bone marrow conditions or other underlying issues affecting your health.
Who is this test for?
This test is recommended if you’re experiencing symptoms such as fatigue, weakness or paleness, which may suggest anaemia. It’s also commonly used in routine health checks or to monitor ongoing conditions.
What are normal MCV values?
Typical MCV values fall between 80 and 100 femtolitres per cell. A result below this range may suggest microcytic (small cell) anaemia, often linked to iron deficiency. A higher value may point to macrocytic (large cell) anaemia, which can be caused by vitamin B12 or folate deficiency. However, interpretation should always be made by a healthcare professional in context with other blood markers.
Can dehydration or infection affect MCV levels?
Dehydration can indirectly influence your blood test results by altering fluid balance, which may affect red blood cell measurements. Some infections, especially those that impact the bone marrow, may also alter MCV values. However, these changes are usually subtle and must be considered alongside clinical symptoms and other blood markers.
What does a high MCV level mean?
A high MCV result, known as macrocytosis, indicates that your red blood cells are larger than normal. This may be due to deficiencies in vitamin B12 or folate, alcohol use, liver disease or certain medications. Less commonly, it may signal a bone marrow disorder. Further tests are often needed to confirm the cause.
Is MCV alone enough to diagnose anaemia?
MCV is a valuable part of the overall assessment, but not enough on its own to confirm or diagnose anaemia. It helps classify anaemia by cell size, which can guide your healthcare provider towards possible causes. A full blood count, ferritin, vitamin B12 and folate levels are often assessed alongside it to provide a complete view.
Mean Cell Volume Test FAQs
- What does MCV mean in a blood test?
MCV stands for Mean Cell Volume. It reflects the average size of your red blood cells and is used to help diagnose different types of anaemia.
- Can low MCV be caused by iron deficiency?
Yes. Iron deficiency is one of the most common causes of low MCV, indicating microcytic (small cell) anaemia.
- Is the MCV test part of a routine blood test?
Yes. MCV is included in a full blood count, which is a routine test often used in general health checks or to investigate symptoms like fatigue.
- Do I need to fast before an MCV test?
No, fasting is not required for an MCV test. You can eat and drink normally before your appointment.
Why Choose The Forbury Clinic?
At The Forbury Clinic, every blood test is carried out with care, accuracy and attention to your wellbeing. Whether you’re exploring unexplained fatigue or checking on long-term health, our experienced team ensures you receive fast, reliable results and expert interpretation where needed. We combine consultant-led diagnostics with a patient-first approach, helping you feel confident and supported from your first enquiry to your final result.
Book a full blood count today to check your Mean Cell Volume and gain valuable insight into your overall health.