Alpha- Fetoprotien (AFP)

Screening procedures such as maternal serum screening (AFP) and ultrasound are available from the first trimester. These non-invasive procedures can provide information about the risk of the fetus having a chromosomal disorder. A screening does not detect Trisomy 18, it only estimates the possibility of the fetus having Trisomy 18. Further testing is required after screening to confirm diagnosis.


FISH (Fluorescent In Situ Hybridization)

This is now commonly used in laboratories to provide very fast results for Trisomy 18. This test uses fluorescent markers to identify problems at chromosome 18 and other genetic disorders. This analysis shows that certain chromosomes are present and how many of each chromosomes exist. This is one of the fastest test results that you are able to receive preliminary results for T18.