NT scan/blood & gender results?!

Has anyone went for the NT scan, got their blood taken and they can detect the gender? Only thin is we wanna have a gender reveal with my parents so is it possible for them to write down the gender on paper or will I just have to wait for the anatomy scan, I go Tomor for nt scan and was wondering what the options are to see what we're having but don't wanna be told over the phone