Has anyone heard of this or had it done ?

Not sure if i can have this test done instead of the amnio.
Just saw it in the pregnancy book you get with your bounty bag.

AFP can be measured in either maternal blood or in amniotic fluid. The AFP measurements is usally raised in babies with neural tube defects (NTD) abd nay be low in babies with Down's syndrome and other chromosomal problems. Detects over 90per cent if babies with NTD.
When it can be dine 15-22 weeks
How: Blood test