Chlamydia trachomatis antibody titres by enzyme-linked immunosorbent assay are useful in predicting severity of adnexal adhesion.

The aim of this study was to investigate the relationship between chlamydia infection and adnexal adhesion. A total of 131 infertile women who were otherwise asymptomatic underwent chlamydia antibody testing and laparoscopy. These women had additional infertility factors. Serum concentration of anti-Chlamydia trachomatis immunoglobulins G and A were determined prospectively by means of an enzyme-linked immunosorbent assay (ELISA). Results were compared with the tubal patency and severity of adnexal adhesion. Sensitivity, specificity, positive and negative predictive value, and likelihood ratios of anti-C.trachomatis antibody titres for the presence of adnexal adhesion were calculated. Patients who were positive for chlamydia antibody had a significantly higher incidence of tubal occlusion than those who were negative (47.1 versus 25.0%). Adnexal adhesion scores were significantly higher in the patients who were positive for chlamydia antibody than those in patients who were negative (17.1 versus 8.5). Adnexal adhesion scores were significantly correlated with anti-chlamydia antibody titre by ELISA [immunoglobulin (Ig) G: r = 0.60, Ig A: r = 0.61]. As the antibody titre by ELISA rose, the specificity, positive predictive value and the positive likelihood ratio all increased. In conclusion, C.trachomatis antibody testing is a simple and inexpensive means of predicting pelvic damage and laparoscopic examination may be recommended for patients with high anti-C.trachomatis antibody titres by ELISA.