Have just come out of hospital again and whilst I was in all drs had trouble getting blood gases from me - each gas took 4 or 5 attempts. They kept saying that because I'd had a lot of gases done, that the arteries can become embolised and that is why it is now difficult. Has anybody else been told this? What happens if I continue to need gases done? Am currently being admitted monthly hypoxic and therefore needing regular gases whilst in.