With a positive risk for T18, you can have a blood draw
for cell-free fetal DNA which is noninvasive to the
fetus and is very sensitive
for T18, T21, and T13. Ask for a referral to a genetic counselor as long as you have one in your area. Over 90% of fetuses with T18 will have abnormal ultrasound findings. With most common findings being heart defects,, growth restriction, and clenched fists.