The verdict is still out on whether it will have any long-term effects, and for this reason, most physicians still use ultrasound sparingly. Ultrasound can be performed at any time throughout the pregnancy. Sound waves are bounced off internal structures, allowing medical personnel to visualize the inside of the body. Ultrasound may be the first prenatal test you encounter, as it s a very accurate method of dating your pregnancy. Ultrasound exams are usually reassuring and even fun for parents.
Fathers seem to especially enjoy the procedure.
After all, they don t get to experience the intimate relationship with the fetus that mom does, and the ultrasound can really help bring the reality of the pregnancy home to them. Maternal Serum Screening Tests Around the 16th week of pregnancy, you may have a blood sample drawn for one of these screening tests. If these substances are found to be above or below certain levels, the fetus may be at higher risk for Down Syndrome or neural tube defects. Getting a positive result back on a maternal serum screening can be agonizing for parents. That s why it is so important to remember that the tests are only for screening purposes.