How is a fasting sample obtained during a calcium-loading test for hypercalciuria?

Updated: Jun 02, 2021
  • Author: Stephen W Leslie, MD, FACS; Chief Editor: Vecihi Batuman, MD, FASN  more...
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The fasting phase begins at 9 pm and continues until 7 am the following morning. The patient voids at 7 am, and the specimen is discarded. He or she is provided with an additional 400-600 mL of water to drink. For the next 2 hours, the patient continues fasting but does not urinate again until 9 am, when he/she is asked to void. The urine is collected and analyzed for calcium and creatinine. This specimen is called the fasting sample.

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