Fasting plasma zinc concentrations were lower in elderly people with senile purpura than in a control group matched for age. No significant difference was found in the mean serum concentration of albumin, which is the main binder of zinc. No other clinical or laboratory findings differentiated the two groups. As the cause of the low plasma zinc values has not been found it is suggested that further studies of the related factors including input, output, and binding should be made before a therapeutic trial is launched.
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