Phosphate, 24‑Hour Urine without Creatinine
Use
Measurement of urinary phosphorus (phosphate) excretion over a 24‑hour period reflects daily dietary phosphate intake and renal excretion under the influence of parathyroid hormone. It is useful for evaluating phosphate handling and day‑to‑day variability in excretion. It may aid in assessment of disorders of phosphate metabolism and kidney function.
Special Instructions
Collect a well‑mixed 24‑hour urine specimen. Do not include the first morning void; collect all subsequent voids and finish with the first morning void on the following day. Record total 24‑hour volume and collection duration on both container and requisition. Refrigerate during and after collection. Aliquot an appropriate volume (e.g., 10 mL) of mixed specimen for submission.
Limitations
Not provided.
Methodology
Other
Biomarkers
Result Turnaround Time
Not provided.
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
10 mL aliquot of well‑mixed 24‑hour urine
Minimum Volume
2 mL
Container
Plastic urine container or urinalysis transport tube (yellow‑top, blue fill line, preservative tube)
Collection Instructions
Collect well‑mixed 24‑hour urine, exclude first morning void, finish with next day first morning void, record volume and duration, refrigerate during and after collection
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | Preserved urine: 6 months; Unpreserved: 48 hours |
| Refrigerated | Preserved urine: 6 months; Unpreserved: 7 days |
| Frozen | Preserved urine: 6 months; Unpreserved: 28 days |