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Phosphate, Random Urine with Creatinine [1696X]
Test Code15824
CPT Codes
84105, 82570
Preferred Specimen
10 mL random urine, collected in a plastic urine container
Minimum Volume
2 mL
Other Acceptable Specimens
Unpreserved urine collected in urinalysis transport tube (yellow-top, blue fill line, preservative tube) • Preserved urine with 6N HCl acid submitted in a plastic urine container
Instructions
Adjust pH to <3.0 with 6N HCl prior to aliquoting for phosphate testing.
Transport Temperature
Preserved urine: Room temperature
Unpreserved urine: Refrigerated (cold packs)
Unpreserved urine: Refrigerated (cold packs)
Specimen Stability
Preserved urine
Room temperature: 6 months
Refrigerated: 6 months
Frozen: 6 months
Unpreserved urine
Room temperature: 48 hours
Refrigerated: 7 days
Frozen: 28 days
Room temperature: 6 months
Refrigerated: 6 months
Frozen: 6 months
Unpreserved urine
Room temperature: 48 hours
Refrigerated: 7 days
Frozen: 28 days
Methodology
Spectrophotometry (SP)
Setup Schedule
Set up: Daily; Report available: 1 day
Reference Range
See Laboratory Report
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.
Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153