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Phosphate, Pediatric Urine with Creatinine
Test Code11215
CPT Codes
82570, 84105
Preferred Specimen
2 mL of a 2nd morning voided urine collected in a plastic urine container
Minimum Volume
0.5 mL
Other Acceptable Specimens
Unpreserved urine collected in a urinalysis transport tube (yellow-top, blue fill line, preservative tube) or preserved urine with 6N HCl acid submitted in a plastic, urine container
Instructions
Adjust pH to <3.0 with 6N HC1 prior to aliquotting for phosphate testing
Transport Temperature
Preserved: Room temperature
Unpreserved: Refrigerated (cold packs)
Unpreserved: Refrigerated (cold packs)
Specimen Stability
Preserved
Room temperature: 6 months
Refrigerated: 6 months
Frozen: 6 months
Unpreserved
Room temperature: 48 hours
Refrigerated: 7 days
Frozen: 28 days
Room temperature: 6 months
Refrigerated: 6 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
The urinary phosphorus concentration is useful to assess calcium and phosphorus balance. The thyroid and kidneys are key organs whose function influence urinary phosphorus concentration.
