Phosphorus, 24 Hour Urine

Test Code

UPHOS24

Quest Code

5246

CPT Codes
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 collection collected in a plastic urine container

Minimum Volume

2 mL

Other Acceptable Specimens

Urine aliquot from a 24 hour collection in a urinalysis transport tube (yellow-top, blue fill line, preservative tube), or Urine aliquot from a 24 hour collection in a plastic leak-proof container - no preservative

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 Urine: Room temperature
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

Methodology
Spectrophotometry (SP)

Setup Schedule

Set up: Daily; Report available: Next day

Reference Range

Male	360-1600	mg/24 h
Female	170-1200	mg/24 h

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

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.