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Test Code RRBP Retinol-Binding Protein, Random, Urine

Reporting Name

Retinol-Binding Protein, Random, U

Useful For

Assessing renal tubular injury or dysfunction


Screening for other tubular abnormalities


Detecting chronic asymptomatic renal tubular dysfunction(2)

Profile Information

Test ID Reporting Name Available Separately Always Performed
CTURA Creatinine Conc Yes, (order CTU) Yes
RBPR Retinol-Binding Protein, 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
  Frozen  7 days

Reference Values

<50 years: <130 mcg/g creatinine

≥50 years: <172 mcg/g creatinine

Day(s) and Time(s) Performed

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

Test Classification

This test uses a reagent or kit labeled by the manufacturer as Research Use Only. 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 U.S. Food and Drug Administration.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
RRBP Retinol-Binding Protein, Random, U 33782-4


Result ID Test Result Name Result LOINC Value
CTURA Creatinine Conc 2161-8
RBO1 Retinol-Binding Protein, Random, U 33782-4
RBPCR RBP/Creat Ratio In Process

Method Name

CTURA: Enzymatic Colorimetric Assay

RBPR: Immunonephelometry


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