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How to use Chlamydia antibody testing in subfertility patients
J A Land1, J L Evers, V J Goossens
1Department of Obstetrics and Gynaecology, Academisch Ziekenhuis Maastricht, The Netherlands.
Human Reproduction (Oxford, England)
|June 10, 1998
Summary
Chlamydia antibody testing (CAT) can help screen for tubal factor subfertility. Optimizing cut-off levels and defining severe tubal pathology improves the accuracy of this screening method.
Area of Science:
- Reproductive Medicine
- Infectious Disease Immunology
Background:
- Chlamydia antibody testing (CAT) is used for screening tubal factor subfertility.
- Existing studies show heterogeneous results and lack of uniformity in cut-off levels and definitions.
Purpose of the Study:
- To evaluate how varying definitions of tubal pathology and modifying cut-off levels impact CAT's clinical utility in predicting subfertility.
- To determine the optimal cut-off level for Chlamydia IgG antibody titres.
Main Methods:
- Prospective cohort study of 227 patients attending a fertility clinic.
- Chlamydia IgG antibody titres were measured and correlated with laparoscopy findings.
- Receiver operating characteristic (ROC) curve analysis was used to determine optimal cut-off levels.
Main Results:
- An optimal cut-off titre of 16 was identified using ROC analysis.
- Increasing the cut-off level enhanced specificity and positive likelihood ratio (LR+) but reduced sensitivity and negative LR (LR-).
- Defining tubal factor subfertility as extensive adhesions or bilateral distal tubal occlusion significantly improved LR+, LR-, and kappa values.
Conclusions:
- CAT is more accurate in predicting severe distal tubal pathology than unspecified tuboperitoneal abnormalities.
- While a titre of 16 is statistically optimal, clinical considerations may favor cut-off levels of 32 or 64.
- The choice of cut-off level should depend on screening objectives and the patient population.