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Test Code UPHO24 Phosphorus Urine 24H, LAB2124



Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: 24-hour urine collection

Specimen Volume: 0.1 mL from a 24-hour timed urine collection. Add 10 mL of 6N HCl

                               as preservative at start of collection. Refrigerate specimen during collection,

                               and send specimen refrigerated.

Stability: Urine specimens for phosphorus may be stored up to 7 days at 2-8°C. 

Collection Instructions: Obtain 24-hour urine jug from laboratory

Note: 1. Alternatively, specimen may be just refrigerated during collection, and acidified to a pH

              of 2 upon receipt in laboratory.

           2. Starting and ending times of collection are required for processing.

           3. When a 24-hour urine for phosphorus is done, a PV (period and volume) must also be

               ordered and resulted. (FOR LAB USE ONLY)

Reference Values

400-1,300 mg/24 hours

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

81050-Timed urine measurement


Useful For

Measurements of inorganic phosphorus are used in the diagnosis and treatment of various disorders, including parathyroid gland and kidney diseases, and vitamin D imbalance.