The product of RDW times HDW can be used with automated red cell analyzers to help identify patients who may have thalassemia.

product of RDW and HDW =

= (RDW) * (HDW)



• RDW is the red cell distribution width




• iron deficiency: formula > 530

• thalassemia minor: formula < 530


Note: I assume that HDW is in g/L. If g/dL (as from the Technicon) are used, the discriminant value becomes 53.

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