Abstract Title:

Predicting delivery date by ultrasound and last menstrual period in early gestation.

Abstract Source:

Obstet Gynecol. 2001 Feb ;97(2):189-94. PMID: 11165580

Abstract Author(s):

P Taipale, V Hiilesmaa

Article Affiliation:

Department of Obstetrics and Gynecology, Jorvi Hospital, Espoo, Finland.


OBJECTIVE: To compare last menstrual period and ultrasonography in predicting delivery date.

METHODS: We used ultrasound to scan 17,221 nonselected singleton pregnancies at 8-16 completed weeks. The last menstrual period (LMP) was considered certain in 13,541 and uncertain in 3680 cases. The duration of pregnancy from the scan to the day of spontaneous delivery was predicted by crown-rump length, biparietal diameter (BPD), and femur length (FL) using linear regression models, and the results were compared with estimates based on LMP.

RESULTS: At all gestational ages, ultrasound was superior to certain LMP in predicting the day of delivery by at least 1.7 days. When deliveries before 37 weeks were excluded, crown-rump length measurement of 15-60 mm (corresponding to 8-12.5 weeks) had the lowest prediction error of 7.3 days. After that time, BPD (at least 21 mm) showed a similar error (7.3 days) and was more precise than crown-rump length. Femur length was slightly less accurate than crown-rump length or BPD. Regression models using a combination of any two or three ultrasonic variables did not improve accuracy of prediction. When ultrasound was used instead of certain LMP, the number of postterm pregnancies decreased from 10.3% to 2.7% (P<.001).

CONCLUSION: Ultrasound was more accurate than LMP in dating, and when it was used the number of postterm pregnancies decreased. Crown-rump length of 15-60 mm was superior to BPD, but then BPD (at least 21 mm) was more precise. Combining more than one ultrasonic measurements did not improve dating accuracy.

Study Type : Review

Print Options

Sayer Ji
Founder of GreenMedInfo.com

Subscribe to our informative Newsletter & receive The Dark Side of Wheat Ebook

Our newsletter serves 500,000 with essential news, research & healthy tips, daily.

Download Now

The Dark Side of Wheat

This website is for information purposes only. By providing the information contained herein we are not diagnosing, treating, curing, mitigating, or preventing any type of disease or medical condition. Before beginning any type of natural, integrative or conventional treatment regimen, it is advisable to seek the advice of a licensed healthcare professional.

© Copyright 2008-2024 GreenMedInfo.com, Journal Articles copyright of original owners, MeSH copyright NLM.