Differential diagnosis includes<unk> , neurogenic/central<unk>  insipidus and psychogenic polydipsia. They may be differentiated by using the water deprivation test. Recently, lab assays for antidiuretic hormone are available and can aid in diagnosis. If able to rehydrate properly, sodium concentration should be nearer to the maximum of the normal range. This, however, is not a diagnostic finding, as it depends on patient hydration. Desmopressin can also be used; if the patient is able to concentrate urine following administration of desmopressin, then the cause of the<unk>  insipidus is neurogenic<unk>  insipidus; if no response occurs to desmopressin, then the cause is likely to be<unk> .
Nephrogenic diabetes insipidus
Central diabetes insipidus
Diabetes insipidus
Syndrome of inappropriate antidiuretic hormone secretion
Vasoplegic syndrome
Primary polydipsia
Diurnal enuresis
Adrenal crisis