Strategy for screening pregnant women for chlamydial infection in a low-prevalence area

Obstet Gynecol. 1993 Sep;82(3):399-404.


Objective: To assess the prevalence and risk factors for chlamydial infection in pregnant women in the Quebec City area and to propose strategies for a screening program.

Methods: From January 1990 to July 1991, pregnant women from six centers were cultured for Chlamydia trachomatis. One hundred thirty-six with positive results and 536 with negative results were included in a case-control study on risk factors for this infection.

Results: The prevalence of C trachomatis was 1.9% (136 of 7305). In a logistic regression analysis, young age (P < .0001, test for trend), nulliparity (odds ratio [OR] 3.3; P < .00001), and a new sexual partner in the last year (OR 3.3; P = .0012) were independently associated with infection. With screening restricted to pregnant women under age 25 or those with at least one risk factor, 81.7% of women positive for C trachomatis would have been detected, whereas only 40.6% of all women would have been cultured.

Conclusion: In a low-prevalence area for chlamydial infection in pregnant women, pre-screening criteria could optimize the use of specific diagnostic tests.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Case-Control Studies
  • Chlamydia Infections / epidemiology*
  • Female
  • Humans
  • Logistic Models
  • Mass Screening*
  • Multivariate Analysis
  • Odds Ratio
  • Pregnancy
  • Pregnancy Complications, Infectious / epidemiology*
  • Prevalence
  • Quebec / epidemiology
  • Risk Factors
  • Urban Health