What's the cut off for the dating scan?

[Nanninoo]

I'm 11 weeks confirmed today at early scan (had previous mmc's so was booked in at the epau for a reassurance scan!) I have my booking in appointment with midwife tomorrow when is the cut off time for the downs screening/dating scan? And when will I recieve my letter for my scan? I booked the app when I was 7+4 weeks and this was the only available next appointment which I think is a little late? the sonographer told me to tel my midwife tomorrow that they need to hurry me for referral for my dating scan but told me they shouldn't have any trouble fitting me in quickly? I'm sure I was 13+1 weeks when I had my dating scan with DS so just wondering when the cut off is? Thanks in advance x

 

[AP]

For specifically the NT screening, the cut off is 14weeks exactly

It depends on the area for the dating scan, here its done 10-14 weeks here where I am.