Possible reasons for having a<unk>  can include: *Abnormal first trimester screen results *Increased nuchal translucency or other abnormal ultrasound findings *Family history of a chromosomal abnormality or other genetic disorder *Parents are known carriers for a genetic disorder * Advanced maternal age (maternal age above 35). AMA is associated with increase risk of Down's syndrome and at age 35, risk is 1:400. Screening tests are usually carried out first before deciding if<unk>  should be done.
Chorionic villus sampling
Non invasive prenatal testing
Amniocentesis
Preimplantation genetic diagnosis
Time-lapse embryo imaging
Fetal scalp blood testing
Karyotype
Magnetogenetics