The Green and King formula uses red cell indices to help identify the cause of microcytosis.


formula of Green and King =

= ((((MCV)^2) * (RDW)) / ((hemoglobin) * 100))



• MCV is the mean red cell volume as measured in femtoliters

• RDW is the red cell distribution width

• hemoglobin is in g/dL



• iron deficiency: > 72

• thalassemia minor: < 72


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