water deprivation test
Diagnostic test that restricts fluid intake to assess urine concentrating ability and diagnose diabetes insipidus.
Full Definition
The water deprivation test is a controlled diagnostic procedure used to evaluate the kidney's ability to concentrate urine and differentiate between various causes of polyuria and polydipsia. During the test, fluid intake is restricted while urine and serum osmolality are monitored at regular intervals. The test helps distinguish between central diabetes insipidus, nephrogenic diabetes insipidus, and primary polydipsia. A desmopressin stimulation phase may follow the deprivation phase to confirm the diagnosis. The test requires careful monitoring to prevent dangerous dehydration and must be performed in a controlled clinical setting.
Usage
Usage note: Document safety monitoring parameters and stopping criteria in procedure notes.
In Context
- "The water deprivation test was terminated early due to excessive weight loss and rising serum osmolality." — Procedure note
- "Water deprivation test results supported a diagnosis of partial central diabetes insipidus." — Test interpretation