The dreaded blood tests

I've been putting off having the required blood tests but as the surgery date draws closer I know that I'm no longer able to put it off. I am soooo terrified that it will come back that my liver is too fatty to have the operation but I need the operation to lose the weight and get rid of the fatty liver...this is such a sucky situation to be in.....should I just bite the bullet and go and have them or hold out a bit longer and hope the optifast works wonders and decreses the fatty levels to something acceptabe very quickly???? Anyone wanting to offer advise would be appreciated.