Down's is one of the easiest abnormalities to screen for via u/s--they can look at the facial bones (nose, forehead), measure the length of the femur, look for an enlarged heart, scan the blood flow to the kidneys--all soft markers that if confirmed would still give you time to do an amnio prior to 22w. For something as easy to diagnose as Down's, I'd be livid that my OB "scheduled" me for an amnio w/out my prior consent.
Muffin, 2010
Bubba, 2013
"You've probably heard the expression 'I believe in God, just not organized religion.' I don't think people would say that if the church truly lived like we are called to live. The expression would change to 'I can't deny what the church does, but I don't believe in their God.' At least then they'd address their rejection of God rather than use the church as a scapegoat." Francis Chan