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  • Title: Fetal fibronectin as a predictor of spontaneous preterm labour in asymptomatic women with a cervical cerclage.
    Author: Duhig KE, Chandiramani M, Seed PT, Briley AL, Kenyon AP, Shennan AH.
    Journal: BJOG; 2009 May; 116(6):799-803. PubMed ID: 19432568.
    Abstract:
    OBJECTIVE: To assess the accuracy of fetal fibronectin (fFN) testing for prediction of preterm labour in asymptomatic high-risk women with a cervical cerclage. DESIGN: Retrospective observational study. SETTING: United Kingdom. POPULATION: Nine hundred and ten asymptomatic women at high-risk of Preterm birth referred to specialist antenatal clinics and undergoing fFN testing between November 1997 and December 2007. METHODS: Women had fFN tests taken between 23(+0) and 27(+6) weeks' gestation, on one or more occasions. MAIN OUTCOME MEASURES: Sensitivity, specificity, positive predictive values and negative predictive values of fFN testing for predicting delivery <30 and <37 weeks were compared in those with and without cerclage. RESULTS: For delivery <30 weeks' gestation, the specificity of fFN testing was significantly lower in women with cervical cerclage (77% vs 90%; P < or = 0.00001). The sensitivity of the test was similar between the groups (78.6 (no-cerclage) vs 60% (cerclage); P > 0.4). The negative predictive value of the fFN test for delivery <30 weeks was high in both groups (>98%). CONCLUSIONS: Asymptomatic high-risk women with cerclage in situ are more likely to have a false positive fFN test. The negative predictive value is similar.
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