I am unsure of your situation and what tests you have done so far. After doing an extensive search, I have not been able to find what O2 means or whether you may mean U2 following an ultrasound.
It would be worth discussing your result with your GP, as they will know your situation and what tests you have had done.
I am sorry I cannot be more helpful on this occasion. If you have more information please feel free to get back to us. You may find it helpful to talk things through with one of the nurses on our helpline. The number to call is Freephone 0808 800 4040 and the lines are open from 9am till 5pm Monday to Friday.
