Test Includes
Creatinine; protein, total; protein:creatinine ratio
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)
Volume
50 mL
Minimum Volume
1 mL (Note: This volume does not allow for repeat testing.)
Container
Plastic urine container, no preservative
Collection
Collect random urine in a clean plastic container. Label the urine container with the patient's full name and the date and time of collection.
Storage Instructions
Room temperature
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | 7 days |
Refrigerated | 14 days |
Frozen | 14 days |
Freeze/thaw cycles | Stable x3 |
Test Details
Use
Protein:creatinine ratio in a first-morning or random untimed "spot" urine specimen is recommended testing to ascertain chronic kidney disease.1 It is also used to evaluate nephrotic syndromes; work up other renal diseases, including malignant hypertension, glomerulonephritis, Goodpasture syndrome, cryoglobulinemia, toxemia of pregnancy, drug nephrotoxicity, and renal tubular lesions; manage myeloma and macroglobulinemia of Waldenström (Bence Jones proteinuria); evaluate hypoproteinemia; tubular proteinurias, including Wilson's disease and Fanconi syndrome. Albumin/Creatinine Ratio, Random Urine is a more sensitive marker of progression and regression of renal disease than urine total protein, especially when urine total protein is <300 mg/g creatinine.
Methodology
Spectrophotometric
Footnotes
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 003129 | Prot+CreatU (Random) | 87434-7 | 013672 | Creatinine, Urine | mg/dL | 2161-8 |
| 003129 | Prot+CreatU (Random) | 87434-7 | 013664 | Protein,Total,Urine | mg/dL | 2888-6 |
| 003129 | Prot+CreatU (Random) | 87434-7 | 100203 | Protein/Creat Ratio | mg/g creat | 2890-2 |
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