Test Details
Methodology
Spectrophotometry
Result Turnaround Time
3 - 6 days
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.
Test Includes
Creatine, urine; creatinine, urine; creatine:creatinine ratio; eGFR calculation
Special Instructions
State patient's sex and 24-hour volume on the test request form.
Specimen Requirements
Specimen
Urine (24-hour), frozen
Volume
10 mL aliquot
Minimum Volume
1 mL aliquot (Note: This volume does not allow for repeat testing.)
Container
Plastic urine container
Collection Instructions
Collect 24-hour urine, no preservative. Mix well.
Storage Instructions
Freeze
Causes for Rejection
Thawed creatine specimen; 6N HCl, boric acid, or alkali added to collection (Acid or alkali preservative will convert creatine to creatinine, falsely lowering creatine values.)
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 003855 | Creatine+Creatinine, 24-Hr Ur | 003477 | Creatine,U,mg/dL | mg/dL | 2149-3 | |
| 003855 | Creatine+Creatinine, 24-Hr Ur | 003476 | Creatine,24-hr Ur | mg/24 hr | 2150-1 | |
| 003855 | Creatine+Creatinine, 24-Hr Ur | 003860 | Creatinine,U | mg/dL | 20624-3 | |
| 003855 | Creatine+Creatinine, 24-Hr Ur | 003861 | Creatinine,Ur 24hr | mg/24 hr | 2162-6 | |
| 003855 | Creatine+Creatinine, 24-Hr Ur | 003856 | Creatine/Creatinine | ratio | 13484-1 | |
| Order Code | 003855 | |||||
| Order Code Name | Creatine+Creatinine, 24-Hr Ur | |||||
| Order Loinc | ||||||
| Result Code | 003477 | |||||
| Result Code Name | Creatine,U,mg/dL | |||||
| UofM | mg/dL | |||||
| Result LOINC | 2149-3 | |||||
| Order Code | 003855 | |||||
| Order Code Name | Creatine+Creatinine, 24-Hr Ur | |||||
| Order Loinc | ||||||
| Result Code | 003476 | |||||
| Result Code Name | Creatine,24-hr Ur | |||||
| UofM | mg/24 hr | |||||
| Result LOINC | 2150-1 | |||||
| Order Code | 003855 | |||||
| Order Code Name | Creatine+Creatinine, 24-Hr Ur | |||||
| Order Loinc | ||||||
| Result Code | 003860 | |||||
| Result Code Name | Creatinine,U | |||||
| UofM | mg/dL | |||||
| Result LOINC | 20624-3 | |||||
| Order Code | 003855 | |||||
| Order Code Name | Creatine+Creatinine, 24-Hr Ur | |||||
| Order Loinc | ||||||
| Result Code | 003861 | |||||
| Result Code Name | Creatinine,Ur 24hr | |||||
| UofM | mg/24 hr | |||||
| Result LOINC | 2162-6 | |||||
| Order Code | 003855 | |||||
| Order Code Name | Creatine+Creatinine, 24-Hr Ur | |||||
| Order Loinc | ||||||
| Result Code | 003856 | |||||
| Result Code Name | Creatine/Creatinine | |||||
| UofM | ratio | |||||
| Result LOINC | 13484-1 |