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Expected Turnaround Time
Within 1 day
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Related Documents
Specimen Requirements
Specimen
Urine (random)
Container
Use random transport tube or urine Monovette® with pH stabilizer (Labcorp N° 56015). Monovette® instructions accompany units.
Collection
Collect urine and transfer to a random urine transport tube or urine Monovette® with pH stabilizer (LabCorp N° 56015). Final pH must be <2.
Storage Instructions
After collection, pH is adjusted to 1.5−2.0 with 6N HCl. Refrigerate.
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | 7 days |
Refrigerated | 14 days |
Frozen | 7 days |
Freeze/thaw cycles | Stable x3 |
Causes for Rejection
Improperly labeled specimen
Test Details
Use
A random urine calcium:creatinine ratio is used to screen for hypercalciuria, as it is found to have a good correlation with 24-hour urine calcium excretion.1 Increased urinary excretion of calcium accompanies hyperparathyroidism, vitamin D intoxication, diseases that destroy bone (such as multiple myeloma), metastasis from prostatic cancer, and following calcium supplementation. Urine calcium is increased with immobilization, with steroid therapy, with Paget disease, and in primary (idiopathic) hypercalciuria.
Methodology
Colorimetric
Footnotes
1. Longman C. Disorders of phosphorus, calcium, and vitamin D. In: Holliday MA, Barrat TM, Avner ED, eds. Pediatric Nephrology. 3rd ed. Baltimore, Md: Williams & Wilkins;1994:619-620.
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 134908 | Calcium/Creatinine Ratio | 9321-1 | 013490 | Calcium, Urine | mg/dL | 18488-7 |
| 134908 | Calcium/Creatinine Ratio | 9321-1 | 013672 | Creatinine, Urine | mg/dL | 2161-8 |
| 134908 | Calcium/Creatinine Ratio | 9321-1 | 134911 | Calcium/Creat.Ratio | mg/g creat | 9321-1 |
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