Hearing the words genetic testing can either be comforting or completely alarming to different families but they are optional and each test has its own guidelines of when it can be done as well as what it tests for.

NIPT (Noninvasive Prenatal Testing)

Noninvasive blood test that is usually done at 10 weeks in the OBGYN office. NIPT is not a diagnosis test but gives your doctor percentages of how likely your baby is to have certain conditions, mainly with chromosomal abnormalities

Amniocentesis 

Amniocentesis is an invasive test in which a needle is inserted into the uterus through the abdomen to remove a sample of amniotic fluid usually between 15-20 weeks gestation in the MFM office. This test does diagnosis genetic conditions like down syndrome or cystic fibrosis and with an amnio your doctor can also use the sample to do a micro ray analysis which can detect deletion or doubled chromosomes 

Source:Cleveland clinic