Trisomy 18

Trisomy 18 is a congenital disorder caused by the presence of an extra #18 chromosome, occurring in about 1 out of 3,000 to 1 out of 6,000 live births.

Trisomy 18 is always fatal, with 50% of babies dying within the first week and an additional 40% dying within the first year. The disorder is characterized by profound mental retardation, heart defects, and central nervous system defects.

Testing options for trisomy 18

• Afp4^® Screening
• Amniocentesis/Amniotic Fluid Testing
• Chorionic Villi Sampling (CVS) Testing
• FirstScreen^®
• IntegratedScreen^SM
• SequentialScreen^SM
• SerumIntegratedScreen^SM

View Test Comparison Chart (PDF)
Compare testing periods, detection rates and risks for screening and diagnostic testing options.

MyTestingOptions.com will continue to add more testing options as they become available through Genzyme. Email me when more testing options are added to this website.