A brief description of our experience with the immunoassay of insulin by the technic of Hales and Randle is given. Insulin values determined in twelve normal children and in seven cases of untreated diabetes mellitus in the fasting state and following a glucose load are presented. A newly diagnosed untreated child with diabetes mellitus had a low fasting insulin and gave very little response to test meal of glucose. Implications of these findings are discussed briefly.

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