Phosphate, 24-Hour Urine (without creatinine) [11319X]
MessageRefrigerate 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.
Test CodePH24U
CPT Codes 84105
IncludesCPT code 81050 may be added at an additional charge for volume measurement
Preferred Specimen10 mL urine aliquot from a well-mixed 24 hour collection
collected in a plastic urine container
Minimum Volume
Other Acceptable SpecimensUrine 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
InstructionsRefrigerate 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 TemperaturePreserved Urine: Room temperature
Unpreserved Urine: Refrigerated (cold packs)
Specimen StabilityPreserved Urine Room temperature: 6 months Refrigerated: 6
months Frozen: 6 months
Unpreserved Urine Room temperature: 48 hours Refrigerated: 7 days
Frozen: 28 days
MethodologySpectrophotometry (SP)
Setup Schedule
Report Available
Reference RangeMale 360-1600 mg/24 h
Female 170-1200 mg/24 h
Clinical SignificancePhosphorus 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
Last Updated: February 20, 2023
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.