If going by your age alone then you are at high risk.
to get the most accurate risk then combined bloods and nuchal are best way.
at 34 i had age risk of 1 in 260 or something so i chose to get blood and scan done privately at a cost of �160. the results from that were about 1 in 4000. It gave me peace of mind and i would certainly do it again if i had another child.
if you want blood and scan done privately get booked soon as it needs to be done before 14 weeks.
i used this company who have their own labs. i had bloods done at my gp and posted to the lab, then had scan and i got my results same day
http://www.babybond.com/