I've always been told between 11 and 14 (as in no time after 13wks 6 days) but what lilias said the scan place will tell you they were always quick to tell me "we will only do it between xwks and y wks, no maam you can't have it at 10wks 6 days".
there is the Triple Screen test which i think is around 16 to 18 weeks, just a copy from the web below...
...A triple screen is a blood test that measures three things called alpha-fetoprotein, human chorionic gonadotropin and unconjugated estriol. The results of the blood test can help your doctor see if your baby may be at higher risk for certain birth defects such as Down syndrome and neural tube defects...
But google it to get more information.
this doesn't seem as popular here, but when I was living in Namibia pregnant with DD, this is what they offered me instead of the combined blood & nuchal at 12 weeks.
You can't have an accurate nuchal scan at 20 weeks......
The thickening on the back of the neck dissipates over time, thus giving an inaccurate/false scan result. Pretty sure 16 weeks is too late for a NT test. The time frame is somewhere near 13-14 weeks.
The blood test test doesn't have the same time constraints. So you could just have that done. But the highest accuracy is when both tests (combined with your age) are done and risks are calculated.
I recently had my NT scan, from my earlier dating scan I was 12 weeks and 5 days, but was measuring 13 weeks and 5 days when I had the NT scan, she said that she may not be able to do it - she said it is alot harder as the baby is more developed and moves around alot more making it much harder for them to get an accurate measurement. She did manage, but it took a long time as the baby was moving alot and was very insistent on lying on its tummy cuddled up to the placenta!
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