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HelpTest Code LAB1232269 Gliadin (Deamidated) Antibody, IgA, Serum
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Reporting Name
Gliadin(Deamidated) Ab, IgA, SSpecimen Type
SerumOrdering Guidance
Cascade testing is recommended for celiac disease. Cascade testing ensures that testing proceeds in an algorithmic fashion. The following cascades are available; select the appropriate one for your specific patient situation.
-CDCOM / Celiac Disease Comprehensive Cascade, Serum and Whole Blood: complete testing including HLA DQ
-CDSP / Celiac Disease Serology Cascade, Serum: complete serology testing excluding HLA DQ
-CDGF / Celiac Disease Gluten-Free Cascade, Serum and Whole Blood: for patients already adhering to a gluten-free diet
To order individual tests, see Celiac Disease Diagnostic Testing Algorithm.
Specimen Required
Supplies: Sarstedt Aliquot Tube 5 mL (T914)
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial.
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | Reject |
| Gross icterus | OK |
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum | Refrigerated (preferred) | 21 days |
| Frozen | 21 days |
Specimen Minimum Volume
0.4 mL
Special Instructions
Day(s) Performed
Monday, Wednesday, Friday
Specimen Retention Time
14 daysReport Available
2 to 4 daysReference Values
Negative: <20.0 U
Weak positive: 20.0-30.0 U
Positive: >30.0 U
Reference values apply to all ages.
Useful For
Assessment of deaminated gliadin IgA antibodies for evaluating patients suspected of having celiac disease, including patients with compatible clinical symptoms, patients with atypical symptoms, and individuals at increased risk (family history, previous diagnosis with associated disorder, positivity for HLA DQ2 and/or DQ8)
Monitoring response to a gluten-free diet in patients with celiac disease
Testing Algorithm
The following algorithms are available:
-Celiac Disease Comprehensive Cascade Test Algorithm
-Celiac Disease Diagnostic Testing Algorithm
-Celiac Disease Gluten-Free Cascade Test Algorithm
CPT Code Information
86258
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| DAGL | Gliadin(Deamidated) Ab, IgA, S | 47393-4 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| DAGL | Gliadin(Deamidated) Ab, IgA, S | 47393-4 |
Method Description
IgA antibodies to deamidated gliadin peptides are detected by enzyme-linked immunosorbent assay by binding to purified peptides adsorbed to the wells of a microtiter plate. Peptides are bound to the wells under conditions that preserve the antigens in their native states. Prediluted controls and diluted patient sera are added to separate wells allowing antibodies to bind to the deamidated gliadin peptides. Unbound sample constituents are washed away, and horseradish peroxidase-labeled antihuman IgA antibody conjugate is added to each well. After a second incubation, unbound enzyme-labeled conjugate is washed away, and bound conjugate is detected by adding tetramethylbenzidine chromogenic substrate. After a final incubation, colored product is measured spectrophotometrically, and the absorbance compared to the low positive calibrator. The intensity of color is directly proportional to the level of IgA antibodies to deamidated gliadin peptides expressed in arbitrary units.(Instruction manual: QUANTA Lite Gliadin IgA II. INOVA Diagnostics, Inc; Rev 2, 10/2019)
Forms
If not ordering electronically, complete, print, and send a Gastroenterology and Hepatology Test Request (T728) with the specimen.