title: Evaluation of a chemiluminescent microparticle immunoassay for determination of Treponema pallidum antibodies.
abstract: Evaluation of a Chemiluminescent Microparticle Immunoassay (CMIA) for determination of anti-Treponema pallidum (TP) antibodies, "ARCHITECT TPAb", was performed. This assay was confirmed to be a reliable anti-TP assay as it showed very good fundamental performance on reproducibility (intra-assay CV: less than 4%), assay specificity (100%, 500/500) and assay sensitivity (100%, 121/121). Since this assay showed very good dilution linearity for samples within the range of 0.59-8.38 S/CO, quantification of the immunoreactivity of anti-TP was attempted. The correction formula for quantification was successfully validated with 8 specimens. The quantified anti-TP, CMIA-QT, calculated by multiplying together the assay's corrected S/CO within the range of 0.59 - 8.38 and the sample dilution factors, showed a strong correlation with the titer of TP particle agglutination (TPPA). The clinical utility of CMIA-QT was evaluated with stored specimens from 5 primary, 5 secondary, and 5 neural syphilis patients. The clinical utility of CMIA-QT was confirmed in the same manner as that of TPPA.
authors.affiliation: The Laboratory for Clinical Investigation, Osaka University Hospital, Suita, Japan. yoshioka@hp-lab.med.osaka-u.ac.jp
authors.forename: Nori
authors.initials: N
authors.lastname: Yoshioka
authors.forename: Matsuo
authors.initials: M
authors.lastname: Deguchi
authors.forename: Masanori
authors.initials: M
authors.lastname: Kagita
authors.forename: Mifumi
authors.initials: M
authors.lastname: Kita
authors.forename: Mikio
authors.initials: M
authors.lastname: Watanabe
authors.forename: Seishi
authors.initials: S
authors.lastname: Asari
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Iwatani
mesh_terms: D000907:Antibodies, Bacterial / Q000032:analysis; D006801:Humans; D007118:Immunoassay / Q000379:methods; D008163:Luminescent Measurements / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013587:Syphilis / Q000175:diagnosis / Q000188:drug therapy / Q000276:immunology; D013588:Syphilis Serodiagnosis / Q000379:methods*; D014210:Treponema pallidum / Q000276:immunology*
chemical_list: D000907:Antibodies, Bacterial