Accuracy of dating pregnancy by ultrasound Online mature sexy chat no registration

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 (LMP) and diagnostic ultrasound.At around seven weeks of pregnancy, it’s reasonably common for women to have their first ultrasound.

accuracy of dating pregnancy by ultrasound-1

Crown/rump length and gestational age are closely compared with each other until around the end of the first trimester.

The ideal time for a sonographer to assess the gestational age in the first trimester is between 7-10 weeks of pregnancy.

Some sonographers believe that at seven weeks of gestation, transvaginal ultrasound provides the best and most accurate visualisation.

This is because the transducer does not need to send sound waves through multiple layers of muscle and tissue to “pick up” the returning images.

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.

The NICE guidelines reviewed the diagnostic value and effectiveness of screening methods in determining gestational age.

Studies identified included a Cochrane review, four RCTs and a number of observational studies.

This is why an early pregnancy dating scan, rather than one done in the later stages of pregnancy, is considered more accurate when assessing the expected date of delivery.

With maturity, the size of the baby correlates less to its age than in the early weeks.

The limbs and the yolk sac, though obviously important, are not the primary means of measuring growth.

Tags: , ,