Jess, the NT scans are not routinely offered for women at low risk of birth defects. It tends to be those in the over 35 age bracket, previous history of miscarriage, or family history of birth defects, etc. The other thing is, this is not neccessarily a useful test to have as it's not 100% accurate and only acts as an indicator for further testing like chorionic villus sampling or amniocentesis (which both involve sticking a big needle through your belly very close to the baby). I opted to have neither of these tests with my first PG in my 20s but now that I'm in an "at risk" group, I will have the NT scan as a possible way of preventing having the CVS or amnio further along (*fingers crossed*).