Fetal Anatomy

The general fetal orientation is first assessed ie longitudinal oblique or transverse. Fetal circulation unlike postnatal circulation involves the umbilical cord and placental blood vessels which carry fetal blood between the fetus and the placenta.

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It is usually established in the fetal period of development and is designed to serve prenatal nutritional needs as well as permit the switch to a neonatal circulatory pattern at birth.

Fetal anatomy. When a level 2 ultrasound is done. When the pregnancy hits the 20th week of gestation an anatomy ultrasound is often ordered. In the axial scan the characteristic lemon sign and banana sign are seen.

If you have a condition that needs to be monitored such as carrying multiples you may have more than one detailed ultrasound. The fetal circulatory system becomes much more specialized and efficient than its embryonic counterpart. This sonogram is used to determine fetal anomalies the babys size and weight and also to measure growth to ensure that the fetus is developing properly.

Fetal ultrasound images can help your health care provider evaluate your babys growth and development and monitor your pregnancy. By the 20th week of pregnancy the baby can weigh up to 11 ounces and measure 10 inches outstretched. The second trimester scan is a routine ultrasound examination in many countries that is primarily used to assess fetal anatomy and detect the presence of any fetal anomalies.

A fetal ultrasound sonogram is an imaging technique that uses sound waves to produce images of a fetus in the uterus. Those who want to can find out the sex of the baby if desired. During this period male and female gonads differentiate.

The fetal period lasts from the ninth week of development until birth. Most anatomy scans are performed in the second trimester of pregnancy typically at 20 weeks but they can be done anytime between 18 weeks and 22 weeks. A fetal anatomy survey cannot detect all fetal problems and the accuracy of the scan depends on the position of the fetus the gestation and maternal build.

The second trimester extends from 13 weeks and 0 days to 27 weeks and 6 days of gestation although the majority of these studies are performed between 18 and 23 weeks. Anatomy scan of the fetal head at 20 weeks of pregnancy in a fetus affected by spina bifida. The anatomy scan is a level 2 ultrasound which is typically performed on pregnant women between 18 and 22 weeks.

In some cases fetal ultrasound is used to evaluate possible problems or help confirm a diagnosis. The fetal position should be determined as precisely as possible before an interpretation of fetal anatomy is begun because the position of a structure will often influence our interpretation. For larger women with increased body fat the diagnostic accuracy is reduced.

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