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Term prediction in routine ultrasound practice

B Backe¹, J Nakling

¹Norwegian Institute of Hospital Research, Trondheim.

Acta Obstetricia Et Gynecologica Scandinavica

|February 1, 1994

Summary

Routine ultrasound accurately predicts delivery dates, offering better precision than last menstrual period calculations. This study evaluated ultrasound

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Area of Science:

Obstetrics and Gynecology
Maternal-Fetal Medicine
Diagnostic Imaging

Background:

Accurate prediction of delivery date is crucial for optimal maternal and neonatal outcomes.
Traditional methods for estimating term, such as the last menstrual period (LMP), have known limitations in precision.
Routine ultrasound screening is increasingly used in clinical practice for pregnancy monitoring.

Purpose of the Study:

To evaluate the precision of routine second-trimester ultrasound in predicting the day of delivery.
To compare the accuracy of ultrasound-derived estimated date of delivery (EDD) with LMP-based EDD.

Main Methods:

A population-based follow-up study involving 1650 women in Norway.
Ultrasound screening was performed in routine clinical practice during the second trimester.
The primary outcome measures were the differences between actual delivery dates and predicted dates from both ultrasound and LMP.

Main Results:

A significantly higher proportion of women delivered within two weeks of their ultrasound-predicted term (87.5%) compared to LMP-based term (79.3%) (p < 0.001).
Deliveries were consistently closer to the ultrasound-predicted term than the LMP-based term, except for deliveries in the 39th week of gestation.
No significant variation in performance was observed among 14 different ultrasound operators.

Conclusions:

Routine ultrasound term prediction in a representative population is more accurate than LMP dating for predicting the day of delivery.
This finding supports the use of routine ultrasound for improved accuracy in estimating gestational term in clinical practice.
The study highlights the value of ultrasound in optimizing obstetric care and potentially improving perinatal outcomes.

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