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Test Code
CDTAU
Test Name
Carbohydrate Deficient Transferrin
CPT Codes
82373
Expected Turnaround Time
3 - 5 days
Clinical Utility

CDT testing can be an effective tool for the early diagnosis of chronic alcohol misuse, for the detection of patients addicted to alcohol, and for the follow-up of treatment and diagnosis of alcohol relapse.
Specimen and Container Info

Specimen Type: Serum

Collection Container: Gold Top, Serum Separator

Alternate Collection Container: Red Top, Plain

Desired Specimen Volume: 1 mL
Collection Instructions
  1. Collect a gold top, serum separator tube via venipuncture.
Processing and Submission Instructions
  1. Separate serum from cells within two hours of collection.
  2. Transfer 1 mL of serum to a LabCorp PP transpak frozen purple tube.
  3. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.
Transport Instructions

Transport to the laboratory frozen. 
Stability Requirements

Room Temperature

 2 days

Refrigerated

2 days

Frozen

7 days

Freeze/Thaw Cycles

 Stable x3
Causes for Rejection
  • Fibrinogen present in sample
  • Hemolyzed specimen
  • Aged and improperly stored specimen
  • Anticoagulated specimen (citrate, EDTA)
  • Presence of genetic variants of transferrin
Methodology
Capillary Electrophoresis
Reference Intervals

See patient report.
Limitations

This test is intended for evaluation of alcohol abuse. This test is not suitable for the evaluation of patients suspected of having CDG syndrome (congenital disorders of glycosylation), genetic variants of transferrin, some monoclonal component, or high polyclonal increases, liver injuries (cirrhosis due to chronic alcohol abuse, end-stage disease).
Alternate Names
  • Diasialotransferrin
  • Transferrin Isoforms
Reference Lab
Labcorp Of America Holdings
Testing Schedule
Routine, 3 times per week
Reflex Tests
CDTC1, CDTC2, CDTC3
The American Medical Association (AMA) Current Procedural Terminology (CPT) codes published by HNL Lab Medicine are guidelines and are intended for informational purposes only. CPT coding is the exclusive responsibility of the billing entity. View the Terms.
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