The Mentzer formula is a commonly used calculation to help identify patients who may have thalassemia.

Mentzer formula =

= ((MCV) / (red blood cell count))



• MCV is the mean corpuscular volume as measured in femtoliters

• The red blood cell count is the number of red blood cells per µL, divided by 10^6.



• Iron deficiency is indicated by a value  > 13.

• Thalassemia minor is indicated by a value < 13.

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