Calcium, Urine
Use
This test measures the amount of calcium in a 24-hour urine sample. It is used to evaluate and monitor conditions that affect calcium metabolism, such as parathyroid disorders, or diseases that lead to the formation of kidney stones. Additionally, it helps in diagnosing hypercalcemia or hypocalcemia by determining if the calcium metabolism problem is due to dietary intake, kidney function, or other metabolic disorders.
Special Instructions
During collection, urine must be refrigerated and pH adjusted to 1.5-2.0 using 6M HCl. It is crucial to record the total volume, collection time interval, and pH on the transport tube and the request form. Handling the specimen correctly ensures accurate test results.
Limitations
This test is not suitable for conditions not affecting calcium metabolism directly. Urinalysis may be limited by improper specimen collection and storage leading to calcium loss or contamination. Variations in dietary intake and hydration status can affect results, and care must be taken to standardize these aspects prior to testing.
New York Approved
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
LOINC Codes
- 35675-8
- 6874-2
- 35674-1
- 2162-6
- 13717-4
- 19153-6
- 30211-7
Result Turnaround Time
0-1 days
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
3 mL
Minimum Volume
0.5 mL
Container
ARUP Standard Transport Tube
Collection Instructions
Collect 24-hour urine specimen; refrigerate during collection. Adjust pH to 1.5-2.0 by adding 6M HCl in 1 mL increments.
Storage Instructions
Refrigerated
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 48 hours |
| Refrigerated | 2 weeks |
| Frozen | 3 weeks |