A simple, safe and standardized overnight 8-hr water deprivation test is described for differentiating diabetes insipidus, due to either antidiuretic hormone(ADH) lack or renal tubular disease, from psychogenie polydipsia by means of the measurement of serum and urine osmolalities. The diagnosis in the patients was first made by performing a standard intravenous hyper tonic sodium chloride infusion test and measuring its effect on urine flow. No overlap in either urine or serum osmolalities was apparent between normals and those with organic diabetes insipidus in the subjects examined in this series.
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Price et al. (1966) studied this question.