Phosphate, 24-Hour Urine with Creatinine

Test code

719

CPT code(s)*

82570, 84105

Not offered in Quest Diagnostics Nichols Institute (IFD) – San Juan Capistrano. Please provide Service area information to confirm Test Code for the lab that services your account or to find available tests you can order.

In-home collection is not available in your area through Quest Mobile.

Clinical significance

Phosphate, 24-Hour Urine with Creatinine - 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.

Test resources

None found for this test
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Details

Test details

Includes

CPT code 81050 may be added at an additional charge for volume measurement

Methodology

Spectrophotometry (SP)

Specimen requirements
Patient preparation	None Specified
Preferred specimen(s)	10 mL urine aliquot from a well-mixed, 24-hour urine collection
Alternative specimen(s)	Aliquot from a well-mixed unpreserved 24-hour collection (keep refrigerated during and after collection) • Urinalysis transport tube (yellow-top, blue fill line, preservative tube)
Minimum volume	2 mL
Collection 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 container	Plastic urine container
Transport temperature	Preserved: Room temperature 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

Reference range(s)

See Laboratory Report

LOINC® codes

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Service Area Information

Performing lab & setup schedule

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Service Area Information

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

*The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.

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