Hemolysis and IgA-antibodies against tissue transglutaminase: When are antibody test results no longer reliable?
| Autor: | Johannes Remmler, Carl Elias Kutzner, Johannes Wolf, Thomas Mothes, Norman Haendel, Thorsten Kaiser |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Microbiology (medical) Tissue transglutaminase Clinical Biochemistry Enzyme-Linked Immunosorbent Assay Hemolysis Gliadin 03 medical and health sciences 0302 clinical medicine GTP-Binding Proteins 030225 pediatrics Biopsy medicine Humans Immunology and Allergy Protein Glutamine gamma Glutamyltransferase 2 Child Research Articles Autoantibodies Transglutaminases biology medicine.diagnostic_test Chemistry Biochemistry (medical) Public Health Environmental and Occupational Health Autoantibody Diagnostic marker Hematology medicine.disease Isotype Molecular biology Immunoglobulin A Celiac Disease Medical Laboratory Technology 030104 developmental biology biology.protein Antibody |
| Zdroj: | Journal of Clinical Laboratory Analysis. 32:e22360 |
| ISSN: | 0887-8013 |
| DOI: | 10.1002/jcla.22360 |
| Popis: | BACKGROUND: Antibodies against tissue transglutaminase (TTG) of isotype IgA (IgA‐aTTG) represent reliable diagnostic markers to confirm or exclude celiac disease (CD). Hemolysis (HL) is an important pre‐analytical factor. HL can be quantified as HL index (HI) correlating with the concentration of free hemoglobin. TTG is abundant in erythrocytes and released upon HL. In immunoassays, the released TTG may interfere with binding of IgA‐aTTG to the coated TTG. METHODS: We selected 17 HL‐free sera from children with biopsy‐confirmed CD: 7 with low‐positive (1‐5 multiples of upper limit of normal [×ULN]), 5 with intermediate (5‐10 × ULN) and 5 with high IgA‐aTTG (10‐15 × ULN). Sera were spiked with hemolysates resulting in HIs ranging from 12.5 to 800 (12.5‐800 mg/dL free hemoglobin). RESULTS: IgA‐aTTG values were significantly decreased (>10%) after addition of hemolysates even if HL was invisible (HI |
| Databáze: | OpenAIRE |
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