Replying to @asaldalad176ibtisam Chorionic Villus Sampling and Amniocentesis are the two tests that will tell definitively if baby has a chromosomal abnormality. A CVS is done earlier than an Amnio and both have about a 1% chance of pregnancy loss so therefore are only done if the pregnancy is at high risk for genetic abnormalities. Since both are invasive procedures, the patient can expect to have mild cramping or bleeding after but usually it is well tolerated with no complications stemming fr