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Infectious Diseases in Obstetrics and Gynecology
Volume 1 (1994), Issue 4, Pages 177-181
Clinical Study

Screening for Chlamydia trachomatis in Low-Risk Obstetric Patients

1Department of Obstetrics and Gynecology, Marshfield Clinic, Marshfield, WI, USA
2Department of Medical Biostatistics of the Research Division, Marshfield Clinic, Marshfield, WI, USA
3Department of Obstetrics and Gynecology, Marshfield Clinic, 1000 North Oak Avenue, Marshfield 54449, WI, USA

Received 27 September 1993; Accepted 3 January 1994

Copyright © 1994 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Objective: The purpose of this study was to evaluate the prevalence of Chlamydia trachomatis in our rural obstetric population and assess the appropriateness of selective vs. universal prenatal screening.

Methods: Between April 1, 1991 and May 1, 1993, 1,587 patients were screened at their first prenatal visit using a C. trachomatis antigen test. Patients who were unmarried, younger than 20 years of age, or had a history of a previous sexually transmitted disease (STD) were classified as being at high risk for C. trachomatis. All others were considered low risk for C. trachomatis.

Results: The overall prevalence of C. trachomatis was 2.0%. There was a significant difference (P < 0.001) in the 1,128 patients considered low risk [0.5%, 95% confidence interval (CI) 0.2–1.2] compared to the 459 patients with one or more identifiable risk factors (5.7%, 95% CI 3.7–8.2).

Conclusions: Routine prenatal screening for C. trachomatis in our population is not appropriate for low-risk patients.