The MCH-to-RBC ratio is another calculation using red cell indices to help identify the possible cause of microcytosis.


MCH-to-RBC ratio =

= (MCH) / (red blood cell count)



• MCH is mean cell hemoglobin as measured in picograms

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



• iron deficiency: > 4.4

• thalassemia minor: < 4.4


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