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Test Code RA1M Alpha-1-Microglobulin, Random, Urine

Reporting Name

Alpha-1-Microglobulin, Random, U

Useful For

Assessment of renal tubular injury or dysfunction


Screening for tubular abnormalities


Detecting chronic asymptomatic renal tubular dysfunction

Profile Information

Test ID Reporting Name Available Separately Always Performed
CTUR Creatinine Conc Yes, (order CTU) Yes
AIMR Alpha-1-Microglobulin, Random, U No Yes

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type


Specimen Required

Container/Tube: Plastic, 5-mL tube (T465)

Specimen Volume: 5 mL

Collection Instructions:

1. Collect a random urine specimen.

2. No preservative.

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Refrigerated (preferred) 7 days
  Ambient  7 days
  Frozen  7 days

Reference Values

<50 years: <13 mg/g creatinine

≥50 years: <20 mg/g creatinine

Day(s) and Time(s) Performed

Varies; 8 a.m.-4 p.m.

Test Classification

This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
RA1M Alpha-1-Microglobulin, Random, U 48415-4


Result ID Test Result Name Result LOINC Value
CTUR Creatinine Conc 2161-8
A1M_U Alpha-1-Microglobulin, Random, U 46723-3
A1M_R A1M/Creat Ratio 48415-4

Reject Due To

All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Method Name

CTUR: Enzymatic Colorimetric Assay

AIMR: Immunonephelometry


If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.