Semen Evaluation. Stallion AI Services performs tests on all semen collected at the centre to make sure only the best quality semen is used for AI. More indepth evaluations are also carried out on frozen semen and this service is also available for stallion owners wishing to know the quality of their stallionsâ semen.
Ultrasound is one of the screening tests that may be done in the first trimester to look for birth defects, such as Down syndrome. The first-trimester screening test uses ultrasound to measure the thickness of the skin at the back of the baby's neck.
The NT measurement varies with the gestational age of the pregnancy. An increased NT measurement is associated with an increased risk for chromosome abnormalities, such as Turner syndrome, as well as congenital heart defects. Turner syndrome is also associated with congenital heart defects. A fetal echocardiogram is a specialized ultrasound of the fetal heart performed after 18 weeks gestation to look for heart defects when indicated. A comprehensive ultrasound can also be performed to look for structural birth defects.