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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Specialty: Hematology Oncology, Clinical Laboratory