QBANK On a routine physical exam, a 25 year old woman admits to drinking ―a lot of water.‖ Upon questioning, she says she drinks the equivalent of about 15

[DianaZ]

On a routine physical exam, a 25 year old woman admits to drinking ―a lot of water.‖ Upon questioning, she says she drinks the equivalent of about 15 L of water a day; she has to urinate about every hour. She says she has felt thirsty ever since a car accident three years ago when ―I lost a lot of blood and hit my head.‖ A routine blood chemistry shows a serum sodium of 144. You decide to perform a water deprivation test. Which of the following lab results after the test would suggest the patient does not have central diabetes insipidus?

A. Low levels of ADH
B. Elevated levels of ADH
C. Low urine osmolarity
D. Elevated plasma osmolarity
E. Hypernatremia