While some studies have found no significant difference in the rate of induction between women who have a first trimester scan and women who have both a first and second trimester scan .
The analysis was therefore unable to conclusively determine whether the benefits of the recommendation would be likely to outweigh the costs.
Diagnostic ultrasound is a sophisticated electronic technology, which uses pulses of high frequency sound to produce an image.
This imaging enables measurement of the fetus and estimation of the gestational age.
Ultrasound examination in the first trimester allows accurate assessment of gestational age, and identifies and allows for appropriate care of women with multiple pregnancies.
Methods used to assess gestational age include known date of ovulation, date of the last menstrual period () and diagnostic ultrasound.
The study found that the earlier the ultrasound assessment in pregnancy (preferably between 10 and 12 weeks), the more accurate the prediction of date of birth.This should only occur if women have been provided with an explanation of the purpose and implications of the tests and have given their informed consent to both tests.Approved by The ability to estimate the range of dates during which birth may occur is influenced by the regularity and length of a woman’s menstrual cycle, whether the date of ovulation (rather than that of intercourse) is known and the timing of any ultrasound assessment.The results indicate that after 24 weeks of pregnancy, a reliable Provide information and offer pregnant women who are unsure of their conception date an ultrasound scan between 8 weeks 0 days and 13 weeks 6 days to determine gestational age, detect multiple pregnancies and accurately time fetal anomaly testing.Approved by The timeframe for ultrasound assessment of gestational age overlaps with that for assessment of nuchal translucency thickness as part of testing for fetal chromosomal anomalies (11 weeks to 13 weeks 6 days), which may enable some women to have both tests in a single scan.