We had a dating scan. I didn't want the NT measurement as such, and didn't have the bloodtest - I believe I am low risk for DS and have heard lots of stories about getting inaccurate results anyway.
But I had a sense that I wanted to know if bubs was ok otherwise (i.e. healthy heart beat, all arms and legs etc!), so we had a 'dating' scan and I was reassured to see that in all other respects baby looked healthy.