Prediction of risk of preterm delivery by cervical assessment by trans-vaginal ultrasound

Shikha Mathur


Background: Our Objectives were to determine the mean cervical length in low risk asymptomatic pregnant population at 22-24 weeks of gestation and to find out the correlation of a cervical length <2.5 cm and presence of funneling with the risk of preterm delivery.

Methods: This study was done at a Tertiary care centre. Cervical assessment for cervical length and presence or absence of funneling was done for low risk asymptomatic pregnant women at 22-24 weeks of gestation. Females 50 in number with cervical length <2.5 cm and 50 with cervical length ≥2.5 cm were followed till delivery. The results were analyzed by obtaining p value.

Results: 90.9% of subjects with a Cervical length <2.5 cm and presence of funneling delivered preterm. 90% of subjects with cervical length ≥2.5 cm delivered at term. The p value of this study was <0.001 indicating that cervical length <2.5 cm at 22-24 weeks of gestation with presence of funneling, is highly predictive of preterm delivery.

Conclusions: There is a definitive correlation between short cervical length with presence of funneling and occurrence of preterm delivery. Trans-vaginal Ultrasound of cervix is a safe, acceptable, sensitive and a cost effective screening test to assess the risk of preterm delivery.


Trans-vaginal ultrasound, Cervical length, Funneling, Preterm delivery

Full Text:



Williams textbook of obstetrics 24th ed. Preterm Birth. Mc.Graw Hill Publications; 2014:855-864.

Arias Fernando. Practical guide to high risk pregnancy and delivery. 3rd ed. Preterm Parturition Syndrome. Elsevier publications; 2012:193-213.

Arisoy R, Yayla M. Trans-vaginal sonographic evaluation of cervix in asymptomatic singleton pregnancy and management options in short cervix. Journal of Pregnancy. 2012:201628.

March of Dimes, PMNCH, save the children and WHO born too soon, the global action report on preterm birth edited by Howson CP, Kinney MV, Lawn JC. Switzerland; 2012.

Georgiou HM, Megan KW, Permezel DM, Brennecke SP. Predicting preterm labour: current status and future prospects. Disease Markers; 2015:435014.

Dutta DC. Textbook of obstetrics 7th ed. revised, preterm labour. New Central Book Agency Pvt. Ltd; 2014;315-341.

Tanveer SG, Samal S, Armugam S, Parida P. Measurement of cervical biometry using trans-vaginal USG in predicting preterm labour. J Nat Sci Bio Med. 2014;5(2):369-72.

Lim K, Vancover BC, Butt K, Fredrericton NB, Crane JM, John NL, et al. Ultrasonographic cervical length assessment in predicting preterm birth in singleton pregnancies. SOGC No. 257. Journal of Obstetrics and Gynaecology can. 2011:33(5):486-99.