Syphilis diagnosis: screening by enzyme immunoassay and variation in fluorescent treponemal antibody absorbed (FTA-ABS) confirmatory test performance.
Four fluorescent treponemal antibody absorbed (FTA-ABS) test kits were evaluated with 86 treponemal and 84 non-treponemal sera selected with enzyme immunoassay (EIA). Agreement between all four kits was 63% for treponemal, and 50% for non-treponemal, sera. Discrepancies with treponemal sera were associated with low levels of antibody characterised by T. pallidum haemagglutination assay (TPHA) titres < or = 160 and a negative Venereal Diseases Research Laboratory (VDRL) test. Discrepancies with non-treponemal sera were significantly associated with false reactivity on screening with EIA. Possible reasons for the differences obtained between kits, the importance of screening policies for pre-selecting sera, and the significance of equivocal (borderline) reactions on positive and negative predictive values are discussed.
Chronas
G
G
STD Diagnostic Laboratory, University of Edinburgh Medical School, Scotland, UK.
Moyes
A
A
Young
H
H
D005069:Evaluation Studies as Topic; D005455:Fluorescent Antibody Technique; D006801:Humans; D007124:Immunoenzyme Techniques; D011933:Reagent Kits, Diagnostic; D013588:Syphilis Serodiagnosis / Q000379:methods*
D011933:Reagent Kits, Diagnostic