Calcium, Random Urine with Creatinine
Test Code
Clinical Significance
Calcium, Random Urine with Creatinine -
This quantitative test, performed with a random urine specimen, may help screen for hypercalciuria, one of the established risk factors for kidney stone formation [1-3]. This test may also help assess metabolic disorders of calcium metabolism, such as hyperparathyroidism, bone disease, and idiopathic hypercalciuria. To adjust for the concentration differences in random urine specimens, calcium to creatinine ratio is included in the results. In general, 24-hour urine specimens are preferred to random urine specimens when measuring calcium for diagnostic evaluation of hypercalciuria [1].
Calcium ...
Test Resources
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Test Details
Methodology
Reference Range(s)
Preferred Specimen(s)
10 mL random urine
Alternative Specimen(s)
Unpreserved urine collected in urinalysis transport tube (yellow-top, blue fill line, preservative tube) • Preserved urine with 6N HCl acid submitted in a plastic, urine container
Minimum Volume
2 mL
Collection Instructions
Collect 10 mL random urine in a plastic screw-cap container and adjust pH to <2 with 6N HCl. Aliquot urine specimens and send at room temperature to the laboratory.
or
It is acceptable to add preservative after collection if urine is refrigerated during collection. Record total volume and collection time on specimen container and requisition.
Transport Container
Plastic urine container
Transport Temperature
Room temperature
Specimen Stability
- Room temperature: 5 days
- Refrigerated: 35 days
- Frozen: 6 months
Setup Schedule
or
It is acceptable to add preservative after collection if urine is refrigerated during collection. Record total volume and collection time on specimen container and requisition.
Refrigerated: 35 days
Frozen: 6 months