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Test Code CDTA Carbohydrate Deficient Transferrin, Adult, Serum

Reporting Name

Carb Def Transferrin, Adult, S

Useful For

An indicator of chronic alcohol abuse


This test is not appropriate for screening patients for congenital disorders of glycosylation.

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type


Advisory Information

This test is for evaluation of alcohol abuse. If the ordering physician is looking for congenital disorders of glycosylation, order CDG / Carbohydrate Deficient Transferrin for Congenital Disorders of Glycosylation, Serum.

Necessary Information

1. Patient's age is required.

2. Reason for referral is required if patient is <21 years old.

Specimen Required

Collection Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Submission Container/Tube: Plastic vial

Specimen Volume: 0.1 mL

Specimen Minimum Volume

0.05 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Frozen (preferred) 45 days
  Refrigerated  28 days
  Ambient  7 days

Reference Values


0.11-0.12 (indeterminate)

Day(s) and Time(s) Performed

Wednesday; 8 a.m.

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 U.S. Food and Drug Administration.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
CDTA Carb Def Transferrin, Adult, S In Process


Result ID Test Result Name Result LOINC Value
31714 Mono-oligo/Di-oligo Ratio 35469-6
31715 Interpretation 59462-2

Reject Due To

Gross hemolysis OK
Gross lipemia OK
Gross icterus OK

NY State Approved


Method Name

Affinity Chromatography/Mass Spectrometry (MS)


If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.