Calcium, 24 Hour, Urine
Use
Evaluation of calcium oxalate and calcium phosphate kidney stone risk, and calculation of urinary supersaturation; evaluation of bone diseases, including osteoporosis and osteomalacia.
Special Instructions
Not provided.
Limitations
Implicit limitations include potential pre‑analytical errors such as improper collection duration, use of laxatives, inadequate refrigeration, or use of metallic‑capped containers—all of which may affect accuracy of 24‑hour urine calcium measurement.
FDA ApprovedNew York Approved
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
Calcium
Analyte
LOINC Codes
- 6874-2 - Calcium 24h Ur-mRate
- 6874-2 - Calcium 24h Ur-mRate
- 13362-9 - Specimen collect Time Ur
- 3167-4 - Specimen vol 24h Ur
Result Turnaround Time
0-3 days
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
4 mL
Minimum Volume
Not provided
Container
24‑hour graduated urine container (no metal cap or glued insert); aliquot in plastic 5 mL tube or clean plastic aliquot container (no metal cap or glued insert)
Collection Instructions
Collect urine for 24 hours; refrigerate specimen within 4 hours of completion; patient should not use a laxative during collection.
Patient Preparation
Patient should not use a laxative during the 24‑hour collection period.
Storage Instructions
Refrigerate specimen within 4 hours of completion of collection. Transport options include ambient, refrigerated (preferred), or frozen; preservatives such as 50 % acetic acid, boric acid, diazolidinyl urea, thymol are OK; 6 M hydrochloric acid OK; nitric acid, sodium carbonate, toluene not OK.
Causes for Rejection
Use of metal‑capped or glued‑insert containers; improper collection duration; improper temperature handling; use of prohibited preservatives.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | up to 72 hours |
| Refrigerated | up to 14 days |
| Frozen | up to 30 days |