The bloods for downs for the nt are done 2-3 weeks before the nt scan. You don't have the 16 weeks bloods for downs if you've had the nt, as the info can b conflicting and wrongly throw up a red flag. however, you can have the 16 week bloods for spina bifida if you want, but they can normally give a pretty good inication of this too at the nt scan.... hope this helps
Congrats on the fab results
