Test Overview
Test Methodology

Phosphomolybdate

Test Usage

Renal function test, evaluate calcium/phosphorus balance. Normal phosphate excretion reflects the dietary intake of phosphate. The excretion varies with growth, dietary intake, renal function, muscle mass and hormonal activity. Urinary phosphate excretion will be decreased in hyperthyroidism.

Reference Range *

400 - 1200 mg/TV (24 hour collection). Random urine collections vary with dietary intake and are dependent on diurnal variation, and are reported in units of mg/dL, for which reference values are not established.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Daily
Analytic Time

8 hours

Soft Order Code
PHOSU/PHOSQ
Synonyms
  • PHOSQ
  • PHOSQ
  • PHOSPHORUS URINE 24 HRS
  • PHOSPHORUS URINE RANDOM
  • PHOSU
  • PHOSPHORUS URINE 24 HOUR
Laboratory
Chemical Pathology
Section
Automation
Specimen Requirements
Collection Instructions

Collect 24 hour urine specimen with no preservative. Aliquot 5 mL into a plastic urine container and refrigerate. Record total 24 hour urine volume and collection dates/times on request form. Random urine also acceptable.

Alternate Specimen
Specimens collected with glacial acetic acid or HCl preservative are acceptable. If collected in container with acid preservative, indicate on container and requisition: "Collected in Acid".
Rejection Criteria
Diapers, sections of diapers, swabs or any other absorbent material will not be accepted as a collection container for urine.
Normal Volume
5 mL aliquot of 24 hour urine collection or 2 mL aliquot of random urine collection.
Minimum Volume
2 mL aliquot of 24 hour urine collection or 1 mL aliquot of random urine collection.
Billing
CPT Code
84105
Fee Code
20305
LOINC
PHOSU 2778-9 PHOSQ 2779-7
NY State Approved
No
Resources