Predicting delivery date by ultrasound and last menstrual period in early gestation.
Taipale P 1Hiilesmaa V. The last menstrual period LMP was considered certain in 13, and uncertain in cases. The duration of pregnancy from the scan to the day of spontaneous delivery was predicted by crown-rump length, biparietal diameter BPDand femur length FL using linear regression models, and the results were compared with estimates based on LMP.
When deliveries before 37 weeks were excluded, crown-rump length measurement of mm corresponding to After that time, BPD at least 21 mm showed a similar error 7. Femur length was slightly less accurate than crown-rump length or BPD.
Ultrasound measurement of the embryo or fetus in the first trimester (up to and including 13 6/7 weeks of gestation) is the most accurate method to establish or. Most ultrasound scans (%, /) were carried out in late estimates are more reliable and should be used.3,4 A valid date of delivery. When LMP and Ultrasound Dates Don't Match: When to Redate? ultrasound is the most accurate time frame for pregnancy dating and can. Ultrasound in early pregnancy (before 12 weeks) – Dating Scan. Ultrasound in early pregnancy more reliable than one done in the second half of pregnancy.
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 Combining more than one ultrasonic measurements did not improve dating accuracy.
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