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|Title:||International standards for IgG and IgM anti-β2glycoprotein antibody measurement|
|Authors:||WILLIS Rohan; GROSSI Claudia; BORGHI Maria Orietta; MARTOS SEVILLA GUSTAVO; ZEGERS Ingrid; SHELDON Joanna; MERONI Pierluigi|
|Citation:||LUPUS vol. 23 no. 12 p. 1317-1319|
|Publisher:||SAGE PUBLICATIONS LTD|
|Type:||Articles in periodicals and books|
|Abstract:||International standards for anti-beta2 glycoprotein I (anti-beta2GPI) testing are needed. We evaluated the suitability of polyclonal/monoclonal candidate reference materials (RM) for the assay. IgG/IgM anti-beta2GPI were affinity-purified (AP) from high-positive antiphospholipid syndrome sera and IgG from HCAL clone supernatant. Igs were tested for purity by SDSPAGE, pooled, concentrated, sterile-filtered and the protein concentration determined. One unit was defined as the binding activity of 1 microgram/ml of AP anti-beta2GPI Ig. IgG/IgM RM were each assigned a unit value using the respective AP material as a calibrator. Polyclonal/monoclonal RM and 30 samples were evaluated for linearity, unit equivalency and commutability. Polyclonal AP material was assigned a value of 100 U IgG and 15U IgM anti-beta2GPI, respectively. IgG-RM had a value of 270 IgG and the IgM-RM of 220.3 IgM anti-beta2GPI U. The linearity (R2) of each RM curve for the various assays ranged from 0.96 to 0.99. Commutability samples fit very well within 95% prediction intervals and had excellent correlation when comparing assays. IgG and IgM polyclonal and IgG monoclonal RM displayed excellent linearity and commutability, being good candidates for better standardization of anti-beta2GPI immunoassays.|
|JRC Directorate:||Health, Consumers and Reference Materials|
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