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Phosphate, 24-Hour Urine with Creatinine
Test Code719X
CPT Codes
82570, 84105
Includes
CPT code 81050 may be added at an additional charge for volume measurement
Preferred Specimen
10 mL urine aliquot from a well-mixed, 24-hour urine collection
Patient Preparation
Do not include first morning specimen; collect all subsequent voidings. The last sample collected should be the first morning specimen voided the following morning at the same time as the previous morning's first voiding.
Minimum Volume
2 mL
Other Acceptable Specimens
Urine collected with 25 mL of 6N HCl to maintain a pH below 3
Instructions
Refrigerate during and after collection. Collect urine with 25 mL of 6N HCl to maintain a pH <3. Do not include first morning specimen; collect all subsequent voidings. The last sample collected should be the first morning specimen voided the following morning at the same time as the previous morning’s first voiding. Specify 24-hour total volume and collection duration on container and test requisition.
Transport Temperature
Preserved: Room temperature
Unpreserved: Refrigerated (cold packs)
Unpreserved: Refrigerated (cold packs)
Specimen Stability
Preserved
Room temperature: 6 months
Refrigerated: 3 months
Frozen: 6 months
Unpreserved
Room temperature: 48 hours
Refrigerated: 7 days
Frozen: 28 days
Room temperature: 6 months
Refrigerated: 3 months
Frozen: 6 months
Unpreserved
Room temperature: 48 hours
Refrigerated: 7 days
Frozen: 28 days
Methodology
Spectrophotometry (SP)
Setup Schedule
P.M. Sets up 2 days a week.
Clinical Significance
Phosphorus is present in many foods with a mean intake of approximately 1500 mg per day for adult males and about 1000 mg per day for adult females. Absorbed phosphate, under the influence of parathyroid hormone is readily excreted in the kidney. Measurement of urinary phosphorus generally reflects dietary intake hence, day-to-day excretion may show considerable variation.
