The 24 hrs urinary phosphate test measures the amount of phosphate in a sample of urine collected over 24 hours. Phosphate is a charged particle (ion) that contains the mineral phosphorus. The body needs phosphorus to build and repair bones and teeth, help nerves function, and make muscles contract.

SPECIMEN: 10 mL (5 mL min.) aliquot of 24-hour urine. Do not use preservatives. Record 24 hour volume on test request form and urine container.
STABILITY: Room: 6 hrs; Refrigerated: 1 week; Frozen: 4 weeks
REPORT: Daily
USAGE: Urinary phosphorus concentration is useful to assess calcium and phosphorus balance. Thyroid and kidneys are key organs whose function influences urinary excretion. Many medical conditions affect urinary phosphorus levels.