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
Patient preparation: patient should not use a laxative during the 24‑hour collection period. Supplies: Sarstedt Aliquot Tube, 5 mL (T914). Collection container: 24‑hour graduated urine container with no metal cap or glued insert. Submission container: plastic 5 mL tube or clean plastic aliquot container with no metal cap or glued insert. Necessary information: 24‑hour volume (in milliliters) and collection duration are required. See “Urine Preservatives‑Collection and Transportation for 24‑Hour Urine Specimens” for handling and transport specifics (ambient, refrigerated, frozen, preservatives options). Complete Renal Diagnostics Test Request (T830) if not ordering electronically.
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
LOINC Codes
- 6874-2
- 6874-2
- 13362-9
- 3167-4
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 |