Name the time in gestation when ultrasound is most accurate 2. Discuss the ACOG recommendations for redating a pregnancy based on trimester. Postgraduate Institute for Medicine PIM requires instructors, planners, managers and other individuals who are in a position to control the content of this activity to disclose any real or apparent conflict of interest COI they may have as related to the content of this activity. PIM is committed to providing its learners with high quality CME activities and related materials that promote improvements or quality in healthcare and not a specific proprietary business interest of a commercial interest.
A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. Most dating scans are done with a trans-abdominal transducer and a fullish bladder. If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures. Dating scans are usually recommended if there is doubt about the validity of the last menstrual period. By 6 to 7 weeks gestation the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage 90 to beats per minute under 6 to 7 weeks, then to beats per minute as the baby matures.
Dating Pregnancy: What Is the Most Accurate Method?
Ask doctors free. Top answers from doctors based on your search:. Bruce J. Stringer answered. The most accurate: The earlier you get your first ultrasound, the more accurate is the estimate of your due date and the age of the pregnancy.
Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 — 5 days of accuracy. But mistakes can be made when determining gender because it depends on the clarity of the images and the skills of the person interpreting them. An ultrasound in the first trimester of pregnancy—prior to 13 weeks—can be used to provide an estimated date of delivery or confirm a due date determined by your last period. Because few women know the exact day they ovulated or conceived, an ultrasound done in the first trimester of pregnancy has been shown to the be the most accurate way to date a pregnancy. Ultrasounds are used to screen for certain conditions and check whether there is something noticeably wrong with your baby.