Home
HelpTest Code RA1U Alpha-1-Microglobulin, Random, Urine
Reporting Name
Alpha-1-Microglobulin, Random, UPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Useful For
Assessment of renal tubular injury or dysfunction using random urine specimens
Screening for tubular abnormalities
Detecting chronic asymptomatic renal tubular dysfunction (2)
Method Name
AIMR: Immunonephelometry
CRETR: Enzymatic Colorimetric Assay
Specimen Required
Container/Tube: Plastic, 5-mL tube
Specimen Volume: 5 mL
Collection Instructions:
1. Collect a random urine specimen.
2. No preservative.
Specimen Type
UrineSpecimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated (preferred) | 7 days | |
| Frozen | 7 days |
Reject Due To
| All specimens will be evaluated at Mayo Clinic Laboratories for test suitability. |
Reference Values
≥18 years: <35 mg/g creatinine
Reference values have not been established for patients who are less than 18 years of age.
Interpretation
Alpha-1-microglobulin above the reference values may indicate a proximal tubular dysfunction. As suggested in the literature, 7 mg/g creatinine is an upper reference limit for pediatric patients of 1 month to 15 years of age.(3)
Day(s) Performed
Varies
Report Available
1 to 7 daysTest Classification
This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| RA1U | Alpha-1-Microglobulin, Random, U | 48415-4 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| A1M_U | Alpha-1-Microglobulin, Random, U | 46723-3 |
| CRETR | Creatinine, Random, U | 2161-8 |
| A1M_R | A1M/Creat Ratio | 48415-4 |
Forms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.
Profile Information
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| AIMR | Alpha-1-Microglobulin, Random, U | No | Yes |
| CRETR | Creatinine, Random, U | Yes, (Order RCTUR) | Yes |