Dear all wise ones
 
Just a quick query, about the timing of AFP testing.  I was always to understand that between 16-18 weeks was optimal, and otherwise could give (even more) unreliable results.  If done at around 20 weeks, what are the chances of this happening, and given the repercussions of further invasive testing, what's the point if you miss the 16-18 week period??
 
Looking forward to some clarification
 
Tania

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