PF.22 Establishing Normograms For Cervical Length in Pregnancy. (26th April 2013) - Khalid, A
Abstract : Objective: To construct normograms for cervical length in low-risk, singleton pregnancies from 14 weeks to 40 weeks gestation. Study design: This was a prospective, cross-sectional study involving low-risk women attending Cork University Maternity Hospital conducted concurrently with a primary study to construct normograms for fetal biometry. Women were recruited in the first trimester and randomly allocated to a single scan between 14–40 weeks gestation. Scans were performed by a sole researcher. Gestation was calculated using the estimated due date assigned by dating scan. Recruits were Irish Caucasian women with a singleton pregnancy. Women with a previous history of preterm labour, mid-trimester pregnancy loss, cervical sutures, cone biopsy and large loop excision of transformation zone (LLETZ) were excluded. Measurements were obtained transvaginally using the Voluson E8 ultrasound by GE Healthcare. Results: Seven-hundred-and-ninety-three women were recruited into the primary study. Five-hundred-and-fifty-five women consented to cervical length measurements and were scanned as per protocol. Median maternal age was 32 (range 17–44). Median BMI was 24.7 (range 17.1–48.6). Nulliparous women constituted 46.5% (369/793) of recruits, 32.6% (261/793) were expecting their second child, 18.3% (145/793) were expecting their third or fourth child, while only 2.3% (18/793) were grand multiparous. Normograms for cervical length have been generated for this population. The following table demonstrates the calculated percentiles for each gestational week. Conclusion: We have constructed normograms for cervical length from 14 to 40 weeks gestation in the low-risk Irish Caucasian population.