The Usefulness of Intrapartum Transperineal Ultrasonography for the Prediction of Mode of Delivery




Angle of progression, Delivery, Head-perineum distance, Labor, Transperineal ultrasound


OBJECTIVE: We aimed to assess the accuracy of intrapartum transperineal ultrasonography that is non-invasive, easy to learn, rapid to perform, comfortable for pregnant women, and low-cost method to evaluate the progress of labor objectively.

STUDY DESIGN: We evaluated two hundred-ten singleton pregnant women at term with cephalic presentation who went into active labor via intrapartum transperineal ultrasonography using the angle of progression and head-perineum distance. Maternal characteristics, conventional vaginal examination findings, mode of delivery, and neonatal results were noted. The data were compared using correlation and regression analysis.
RESULTS: The relationships between the descent of clinical fetal head station, the increase of angle of progression (p=0.001), and the decrease of head-perineum distance (p=0.001) were statistically significant. The receiver operating characteristics curve showed that measurement of angle of progression with <110.5 degrees (p=0.001) and measurement of head-perineum distance with >52.5 millimeters (p=0.001) were associated with emergent cesarean delivery. For the prediction of delivery mode, both angle of progression and head-perineum distance had high sensitivity and specificity.

CONCLUSIONS: Intrapartum transperineal ultrasonography parameters were in agreement with each other and conventional vaginal examination for determination of delivery mode. Head-perineum distance was a parity-dependent measurement whilst angle of progression was parity-independent.


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Author Biographies

Erdinc Saridogan, Tunceli State Hospital

MD, Specialist Doctor, Department of Obstetrics and Gynecology

Ozlem Moraloglu Tekin, University of Health Sciences, Ankara City Hospital

MD, Professor, Department of Obstetrics and Gynecology




How to Cite

Saridogan E, Moraloglu Tekin O. The Usefulness of Intrapartum Transperineal Ultrasonography for the Prediction of Mode of Delivery. Gynecol Obstet Reprod Med [Internet]. 2021Aug.2 [cited 2022Jul.7];27(2):116-22. Available from:



Obstetrics; Maternal Fetal Medicine and Perinatology

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