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Carina Törn

Coordinator

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A comparison of serum and EDTA plasma in the measurement of glutamic acid decarboxylase autoantibodies (GADA) and autoantibodies to islet antigen-2 (IA-2A) using the RSR radioimmunoassay (RIA) and enzyme linked immunosorbent assay (ELISA) kits.

Author

  • Kobra Rahmati
  • Åke Lernmark
  • Charlotte Becker
  • Anna Foltyn Zadura
  • Karin Larsson
  • Sten Ivarsson
  • Carina Törn

Summary, in English

BACKGROUND: Glutamic acid decarboxylase antibodies (GADA) and tyrosine phosphatase antibodies (islet antigen-2 antibodies; IA-2A) are used in clinical practise to identify type 1 diabetes. METHODS: GADA and IA-2A were measured with RSR-ELISA kits in samples from 76 newly diagnosed type 1 diabetic children and 120 healthy controls. The aim was to evaluate performance of RSR-ELISA kits for GADA and IA-2A when serum and Ca2+ treated plasma were used. RESULTS: GADA achieved high area under the curve (AUC) both for serum 0.95 (95% CI 0.90-0.99) and for Ca2+ treated plasma 0.95 (95% CI 0.91-0.99). At specificity 98%, sensitivity was 84% for serum and 87% for Ca2+ treated plasma. IA-2A achieved AUC 0.92 (95% CI 0.87-0.97) for serum and 0.94 (95% CI 0.90-0.98) for Ca2+ treated plasma. Using the lowest standard (15 WHO-Units/ml) as cut-off, specificity for serum was 100% and for Ca2+ treated plasma 99% with sensitivity 74% in both cases. Sensitivity was higher in ELISA compared to RIA (74%; p = 0.0080) for GADA measurement and similar for ELISA and RIA IA-2A measurements (76%; p = 0.50). CONCLUSION: Both RSR-ELISAs, GADA and IA-2A showed excellent performance for serum as well as for Ca2+ treated plasma.

Department/s

  • Celiac Disease and Diabetes Unit
  • Clinical Chemistry, Malmö
  • Paediatric Endocrinology

Publishing year

2008

Language

English

Pages

227-235

Publication/Series

Clinical Laboratory

Volume

54

Issue

7-8

Document type

Journal article

Publisher

Clin Lab. Publications

Topic

  • Endocrinology and Diabetes

Status

Published

Research group

  • Celiac Disease and Diabetes Unit
  • Clinical Chemistry, Malmö
  • Paediatric Endocrinology

ISBN/ISSN/Other

  • ISSN: 1433-6510