DIAGNOSTIC_TEST
Deamino Arginine Vasopressin (dDAVP)
After voiding, 40 μg 1-desamino-8-D arginine vasopressin (dDAVP) will be administered intranasally. Throughout the day, urine volume and maximal renal concentrating ability will be determined by measuring osmolality in urine collected at 4 and 6 hours after administration of dDAVP. In addition, water intake, body weight, blood pressure and heart rate will be determined at baseline and 6 hours after administration of dDAVP.