The timed urine collection will begin when the participant first has the urge to void. The nursing staff will record the time of the first void and the participant will be asked to collect all urine voided during the remainder of the study visit in a collection container. To facilitate complete bladder emptying, the participant will be given a glass (approximately 6 ounces) of a non-caffeinated beverage every hour until the end of the study visit. As outlined above, if three weeks or more has elapsed since the health screening, women of childbearing age will be administered a urine pregnancy test using an aliquot of the intra-study timed urine collection. Subjects with diabetes will be asked to check their blood sugar with their own equipment or the nursing staff at the CTRC will use the CTRC's equipment. The study physician will be informed of low or high blood sugars.