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Test ID NBLD0628 Retinol-Binding Protein, Random, Urine

Useful For

Assessing renal tubular injury or dysfunction using random urine collections


Screening for other tubular abnormalities


Detecting chronic asymptomatic renal tubular dysfunction.(2)

Specimen Type


Specimen Required

Container/Tube: Plastic, 5-mL tube

Specimen Volume: 5 mL

Collection Instructions:

1. Collect a random urine specimen.

2. No preservative.

Specimen Minimum Volume

1 mL

Reject Due To

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

Specimen Stability Information

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

Day(s) Performed


Report Available

1 to 7 days

Method Name

CRETR: Enzymatic Colorimetric Assay

RBPR: Immunonephelometry

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

83883-Retinol -Binding Protein, Random, U

82570-Creatinine, Random, U

Secondary ID


Reporting Name

Retinol-Binding Protein, Random, U

Reference Values

≥18 years: <190 mcg/g creatinine

Reference values have not been established for patients that are less than 18 years of age.

Test Classification

This test was developed, and its performance characteristics 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.

Profile Information

Test ID Reporting Name Available Separately Always Performed
CRETR Creatinine, Random, U Yes, (Order RCTUR) Yes
RBPR Retinol-Binding Protein, Random, U No Yes


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