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St. John Health System
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Celiac Disease Panel - Pediatric

Order Name PED CELIAC
Test Number: 5537675
Revision Date 04/03/2024
Test Name Methodology LOINC Code
Tissue Transglutaminase IgA (IgA anti-tTG)
Chemiluminescence Assay 46128-5 
Gliadin Deamidated Antibody, IgA
Chemiluminescence Assay 63453-5 
Immunoglobulin IgA Quantitative
Turbidometric 2458-8 
.Celiac Pediatric Interp
Interpretive information.  
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1 mL (0.5 mL) Serum Clot Activator SST Refrigerated
Instructions Allow specimen to clot completely at room temperature. Separate serum from cells ASAP or within 2 hours of collection.
Stability After separation from cells: Ambient 8 hours, Refrigerated 2 days, Frozen 30 days (avoid repeated freeze/thaw cycles).
GENERAL INFORMATION
Testing Schedule Mon, Wed, Fri 
Expected TAT 2-5 Days 
Clinical Use Serologic testing for Celiac Disease (CD) in children less than 3 years of age should be interpreted knowing that the IgA anti-tissue Transglutaminase (IgA anti-tTG) is approximately 90% sensitive in children of this age. In older children and adults, the sensitivity increases to 96%. In children less than 3 years of age, IgG anti-tTG is not reliable. IgA deficiency is 10-15 times more common in patients with CD, occurring in an estimated 2-3% of the patients with CD. IgA and IgG anti-deaminated gliadin peptide (DGP) are also useful markers in CD. 
Notes Recent literature has reported that Celiac disease (CD) is a more common disorder in the United States than previously recognized.
CPT Code(s) 86258 82784, 86364
Internal Comments OLDER CLINICAL USE REMOVED 10-22-15 -JK
Evaluation of Celiac Disease in pediatric patients less than 3 years of age. In toddlers, IgG anti-tTG is not reliable, and referral for a small bowel biopsy is recommended for those with serum IgA deficiency.
10/20/17 stab - JK
5/15/18 stab again - JK
1/11/24  - JK - The Tissue Transglutaminase IgA (IgA anti-tTG) is CPT 86364.
2022 cpt from 83516 to 86364 - JK
from 83516x2; 82784 to 83516 82784, 86364
5537675( Ped Celiac pnl) - change cpt on Deaminated gliadin ab IgA from 83516 to 86258;  - JK 4/3/24
Service Provided By Labcorp Oklahoma, Inc.
Lab Section Immunology - Serology