Mean Corpuscular Volume (MCV)
MCV measures the average volume of a single red blood cell. It helps classify the type of anemia you may have: small cells (microcytic) often point to iron deficiency, while large cells (macrocytic) suggest B12 or folate deficiency. Normal-sized cells with low hemoglobin indicate normocytic anemia, which has different causes.
Reference Ranges
Male
80 – 100
fL
Female
80 – 100
fL
Child
75 – 95
fL
Ages 6–12
Reference ranges may vary by laboratory. Always compare with the range printed on your lab report.
What Low Levels Mean
Low MCV (microcytic anemia) means your red cells are smaller than normal. The most common cause is iron deficiency, followed by thalassemia (a genetic condition common in India), chronic disease, and lead poisoning.
What High Levels Mean
High MCV (macrocytic anemia) means your red cells are larger than normal. Common causes include vitamin B12 deficiency, folate deficiency, hypothyroidism, liver disease, and certain medications. Alcohol abuse is a frequent cause.
Frequently Asked Questions
What does MCV tell about anemia type?
MCV classifies anemia into three types: microcytic (<80 fL, usually iron deficiency or thalassemia), normocytic (80–100 fL, chronic disease or kidney failure), and macrocytic (>100 fL, B12/folate deficiency or liver disease). This helps doctors narrow down the cause.
Can thalassemia cause low MCV?
Yes. Thalassemia trait (carrier state) causes persistently low MCV with mild or no anemia. It is very common in India and is often confused with iron deficiency. An HbA2 test (hemoglobin electrophoresis) can distinguish between the two.
Should I worry about slightly high MCV?
MCV of 100–105 fL is mildly elevated and may be caused by alcohol, certain medications (metformin, methotrexate), or early B12 deficiency. Values above 110 fL are more significant and warrant testing for B12, folate, and thyroid function.
This information is for educational purposes only and should not replace professional medical advice. Always consult your doctor for interpretation of your test results.
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