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.
If a fetal structural anomaly is identified on. ultrasound examination, invasive prenatal diagnosis should be offered. A patient with. a positive test result should be referred for genetic counseling and offered invasive. prenatal diagnosis for confirmation of test results. A negative cell free fetal DNA test. result does not ensure an unaffected pregnancy.