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pulous countries. Selection of the individuals is as important as the method or the reagent used in the method when a particular parameter is studied. Repleting the vitamin stores in the confirmed vitamin-deficient patients is more appropriate and easily feasible, since anyway they require treatment, than doing the same on the apparently healthy people. The data thus obtained can be better used as the reference value, for a more meaningful interpretation. The reference range can in turn be used to identify the sub-clinically deficient