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HelpTest Code 24CAU Calcium, urine, 24 hr
Laboratory Code
LAB814
Specimen Requirements
Specimen Type: 24 hr urine
Container/Tube: The following types of 24 hr urine containers are acceptable:
- No preservatives
- 3.0 g Thymol
Volume: 4000.0 mL
Minimum Volume: 20.0 mL
Collection Instructions: Collect urine in 24 hr urine container with a suitable preservative (available at laboratory). Dietary and drugs restrictions required.
Please refer to NUH's Urine Preservative Guide
Specimen Stability
| Specimen Type | 24 hr urine |
|---|---|
| Ambient | 2 days |
| Refrigerate | 4 days |
| Frozen | 3 weeks |
Methodology
Colorimetry
Days and Times Performed
24 hrs, TAT 1 day
Specimen Condition
| Haemolysis | Not applicable |
|---|---|
| Icterus | Not applicable |
| Lipaemia | Not applicable |
| Others | Not applicable |
Reference Interval
| Calcium-free diet | 0.1 to 1.0 mmol/day |
|---|---|
| Low to average | 1.3 to 3.8 mmol/day |
| Average (800 mg/day or 20 mmol/day) | 2.5 to 7.5 mmol/day |
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Evaluation of calcium metabolism
Service Code
31401
LOINC Code Information
| Urine volume, total | 3167-4 |
|---|---|
| Calcium, urine | 2004-0 |
| Calcium, urine, 24 hr | 14637-3 |
Update
Last updated 10/03/2025