It's nothing to worry about. It means there's a slightly increased risk of slow growth or placenta not working as well in later pregnancy.
Most NHS trusts do serial growth scans from around 28 weeks to check on this and ensure there's no problem. My next scan is on Tues and I'll be 34 +2 then.
If it makes you feel better I've got the opposite problem to what is expected. Despite low papp-a my little man is huge (95th percentile). I've just done a second diabetes test (first was clear but 5 weeks later + glucose in urine). If I fail the diabetes test I then need to see the diabetes team, if its negative I have to see a consultant due to my baby's size big size.
The papp-a thing is just an increase risk of restricted growth, but as I show its not always the case. Hope that helps.
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