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HelpTest Code CA-CR Calcium/Creatinine Urine Ratio
Useful For
Monitoring of Urine Calcium
Synonyms/Keywords
Urine Calcium/Creatinine Ratio
Specimen Requirements
| Fasting Required | Specimen Type | Preferred Container/Tube | Acceptable Container/Tube | Specimen Volume | Specimen Minimum Volume (allows for 1 repeat) |
Pediatric Minimum Volume (no repeat) |
|---|---|---|---|---|---|---|
| No | Urine, 2nd morning random specimen (collected between 8:00 a.m.-11:00 a.m.) | 50 mg sulfamic acid aliquot tube | Tube or sage container and acidify with dilute hydrochloric acid to a pH <5 | 10 mL | 5 mL | 2 mL |
Collection/Processing Instructions
Collect a second morning random urine, preferably collected between 8:00 a.m. and 11:00 a.m. Pediatric: For untrained children, collect from 6:00 a.m. - 11:00 a.m.
Adjust urine pH to < 5 with sulfamic acid or dilute hydrochloric acid.
Acceptable, but not preferred: collect without preservative, keep refrigerated. Acidify upon arrival to lab and prior to analysis.
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Urine | Refrigerate | 14 days |
Test Components
Urine Calcium, Urine Creatinine
Reference Range Information
| Performing Location | Reference Range |
|---|---|
| Marshfield |
Age 0-1 year: 0.03-0.81 mg Ca/mg Creat Age 1-2 years: 0.03-0.56 mg Ca/mg Creat Age 2-3: 0.02-0.50 mg Ca/mg Creat Age 3-5: 0.02-0.41 mg Ca/mg Creat Age 5-7: 0.01-0.30 mg Ca/mg Creat Age 7-10: 0.01-0.25 mg Ca/mg Creat Age > or = 10: 0.01-0.22 mg Ca/mg Creat |
Marshfield Labs Performing Department
Marshfield Labs Chemistry
Performing Information
| Performing Location | Day(s) Test Performed | Analytical Time | Methodology/Instrumentation |
|---|---|---|---|
| Marshfield | Monday through Sunday | Less than 2 hours |
Arsenazo III Endpoint Assay - Calcium Alkaline Picrate - Creatinine Beckman AU |
CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 82310 | 1 | Assay of calcium | ||
| 82570 | 1 | Assay of urine creatinine |
Outreach CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 82310 | 1 | Assay of calcium | ||
| 82570 | 1 | Assay of urine creatinine |
Ordering Applications
| Ordering Application | Description |
|---|---|
| Cerner | Calcium/Creatinine Urine Ration, Random |