Test Details
Methodology
Colorimetric
Result 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.
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.
Footnotes
Specimen Requirements
Specimen
Urine (random)
Container
Use random transport tube or urine Monovette® with pH stabilizer (Labcorp N° 56015). Monovette® instructions accompany units.
Collection Instructions
Collect urine and transfer to a random urine transport tube or urine Monovette® with pH stabilizer (LabCorp N° 56015). Final pH must be <2.
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | 7 days |
Refrigerated | 14 days |
Frozen | 7 days |
Freeze/thaw cycles | Stable x3 |
Storage Instructions
After collection, pH is adjusted to 1.5−2.0 with 6N HCl. Refrigerate.
Causes for Rejection
Improperly labeled specimen
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 |
| Order Code | 134908 | |||||
| Order Code Name | Calcium/Creatinine Ratio | |||||
| Order Loinc | 9321-1 | |||||
| Result Code | 013490 | |||||
| Result Code Name | Calcium, Urine | |||||
| UofM | mg/dL | |||||
| Result LOINC | 18488-7 | |||||
| Order Code | 134908 | |||||
| Order Code Name | Calcium/Creatinine Ratio | |||||
| Order Loinc | 9321-1 | |||||
| Result Code | 013672 | |||||
| Result Code Name | Creatinine, Urine | |||||
| UofM | mg/dL | |||||
| Result LOINC | 2161-8 | |||||
| Order Code | 134908 | |||||
| Order Code Name | Calcium/Creatinine Ratio | |||||
| Order Loinc | 9321-1 | |||||
| Result Code | 134911 | |||||
| Result Code Name | Calcium/Creat.Ratio | |||||
| UofM | mg/g creat | |||||
| Result LOINC | 9321-1 |