MCV (Mean Corpuscular Volume) – Red Blood Cell Size Marker
MCV (Mean Corpuscular Volume) indicates the average volume of your red blood cells in femtoliters (fL). Small cells (microcytic) suggest iron deficiency or thalassemia, normal-sized cells (normocytic) point to chronic disease, and large cells (macrocytic) often indicate B12 or folate deficiency. MCV is an essential part of every complete blood count.
Why Test MCV?
MCV helps your doctor determine the cause of anemia by classifying red blood cell size. It is useful when investigating fatigue, pallor, or abnormal hemoglobin results, and for monitoring treatment of known blood disorders.
What Do High MCV Levels Mean?
Elevated MCV (macrocytosis) means red blood cells are larger than normal. Common causes include vitamin B12 or folate deficiency, alcohol abuse, liver disease, hypothyroidism, certain medications, and bone marrow disorders.
What Do Low MCV Levels Mean?
Low MCV (microcytosis) means red blood cells are smaller than normal. Common causes include iron-deficiency anemia, thalassemia, chronic inflammatory diseases, and lead poisoning.
Symptoms to Watch For
- Fatigue and weakness
- Pale skin
- Dizziness or lightheadedness
- Shortness of breath
- Tingling in hands and feet (B12 deficiency)
- Difficulty concentrating
Who Should Get Tested?
- People with suspected or confirmed anemia
- Those with fatigue, dizziness, or pale skin
- Individuals being evaluated for iron, B12, or folate deficiency
- Patients monitoring known blood disorders
- Anyone with abnormal findings in other blood tests
How to Prepare for Your Test
No special preparation is required. Bring valid ID to your appointment.
Frequently Asked Questions
What is a normal MCV level?
Can alcohol affect MCV?
Should MCV be interpreted alone?
Reviewed by
Wellth Team
Wellth
Our content is written and reviewed by Wellth, and fact-checked against peer-reviewed research and current Swedish clinical guidelines.
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The information on this page is provided for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment. Wellth provides health information and testing services but is not a substitute for clinical care. Always consult a qualified healthcare provider if you have questions about a medical condition. If you are experiencing severe or urgent symptoms, contact your doctor or call 1177 Vårdguiden. Blood test results should be interpreted by a qualified healthcare professional in the context of your complete medical history.