Hi--
It tests for a bunch of conditions, including spina bifida and other neural defects. I refused amniocentesis, even though the last 4 I had were born after I was 40. Heck, I was 46 when I had the last one!
But I gladly had the quad test because there was no risk of harming the babies and it gave me peace of mind since my husband's cousin had a Down's baby and mine had one with spina bifida. If the quad test shows concerns, then you might want to opt for further testing.
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