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Test Code UPHO24 Phosphorus Urine 24H, LAB2124

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. 



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