SMFM and other professional organizations have released guidance on cervical length (CL) screening for preterm birth (PTB) prevention. The finding of a short cervix, irrespective of obstetric history, has been consistently shown to be associated with higher risk for PTB.
Note: SMFM does not recommend routine CL surveillance in women with cerclage, multiple gestation, PPROM, or placenta previa (Grade 2B)
Screening in Asymptomatic women
Surveillance in asymptomatic women with prior sPTB
Two thirds of preterm births are spontaneous, and only 10% of births <34 weeks will occur to women with a history of spontaneous preterm birth (sPTB). Few predictive tests are available for PTB prediction, and mid-trimester CL assessment remains the best clinical tool at identifying high-risk women. Women with short cervix and prior sPTB are at highest risk.
SMFM Consult Series #40: The role of routine cervical length screening in selected high-and low-risk women for preterm birth prevention
ISUOG Practice Guidelines (Updated): Performance of the routine mid-trimester fetal ultrasound scan
Fetal Medicine Foundation Cervical Length Assessment Program
SOGC: Universal Cervical Length Screening
FIGO: Best Practices in Maternal Fetal Medicine
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