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Alphabetical Index
Tissue Transglutaminase Antibody, IgA (LAB002263)
Test Mnemonic:

TTG, IgA
Specimen Requirements:
Collection:

Routine venipuncture.
Container:

Preferred: Serum (SST, Red Top, RST). Acceptable: Plasma (Lavendar, Light Blue)
Minimum Volume:

1 mL
Storage/Transport:

Deliver to Sample Management within 2 hours of collection if unspun.
Stability:

14 days refrigerated. 
Causes for Rejection:

Lipemic, hemolyzed or microbially contaminated samples may give poor results.
Specimen Preparation:

Allow specimen to clot completely at room temperature. Centrifuge to separate serum from cells within 2 hours of collection.
Methodology:

Immunoflourescense
Performed:
Lab:

Special Chemistry
Turnaround Time:

Two business days
Reference Range:

Negative (<7.0 U/mL)
CPT 4 Code:

83516
Patient Preparation :

None.
Clinical Indication:

Screening for the prescence of Celiac Disease and monitoring the status of previously diagnosed patients.
Effective Date: 01/04/2022
Reviewed By/Date: -
Approved By/Date: Okorodudu, Anthony - 02/21/2022
When ordering tests for which Medicare or Medicaid reimbursement will be sought, physicians should only order tests that are medically necessary for the diagnosis or treatment of the patient. Components of the organ or disease panels may be ordered individually. The diagnostic information must substantiate all tests ordered and must be in the form of an ICD-10 code or its verbal equivalent.

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