|A.||Vasopressin injection in a water deprivation test raises urine osmolality greater than 9%|
There is low serum osmolality with high urine osmolality
Vasopressin has no effect on urine osmolality during a water deprivation test
There is a high serum glucose with a high urine osmolality
Ans. a. Vasopressin injection in a water deprivation test raises urine osmolality greater than 9%
Sarcoidosis can cause central diabetes insipidus (DI).
If vasopressin has a large effect, DI is central in origin.
If vasopressin does not have an effect, DI is nephrogenic in origin.
High glucose with high urine osmolality is seen in diabetes mellitus.