Before anyone undergoes a test for PFO they should be prepared for a positive result, I was lucky that I was treated by the head of hyperbaric medicine and he put the PFO risk in perspective.
There is no doubt a PFO is an added risk but it really only comes into it's own when combined with other factors, if it were the smoking gun many believe it to be with an estimated 1 in 3 divers having one, the chambers would full every day.
Basically what I'm trying to say is don't be influenced by the well meaning ''go get a test'' brigade without thinking it through, also I found this helpful
DAN Divers Alert Network : Patent Foramen Ovale: Is It Important to Divers?
Good luck.
Safe diving,
Steve