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Evidence for progesterone in recurrent spontaneous preterm birth is strongest in women with a short cervix, whereas benefit is much less consistent when cervical length is normal. Recent randomized studies have therefore refined earlier broad recommendations and emphasize phenotype-specific prevention. For obstetricians, the practical lesson is to distinguish a history-based risk factor from a current anatomical biomarker. Women with prior spontaneous preterm birth may need serial cervical-length assessment and individualized preventive planning rather than automatic progesterone for everyone. The study illustrates how treatment recommendations can change as higher-quality trials challenge assumptions based on older observational data. Shared decision-making should include prior obstetric history, cervical findings and alternative preventive measures such as cerclage when indicated.
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Evidence for progesterone in recurrent spontaneous preterm birth is strongest in women with a short cervix, whereas benefit is much less consistent when cervical length is normal. Recent randomized studies have therefore refined earlier broad recommendations and emphasize phenotype-specific prevention. For obstetricians, the practical lesson is to distinguish a history-based risk factor from a current anatomical biomarker. Women with prior spontaneous preterm birth may need serial cervical-length assessment and individualized preventive planning rather than automatic progesterone for everyone. The study illustrates how treatment recommendations can change as higher-quality trials challenge assumptions based on older observational data. Shared decision-making should include prior obstetric history, cervical findings and alternative preventive measures such as cerclage when indicated.
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