Has anyone ever been denied surgery as a result of an arterial blood gas test?

my surgery is set for next friday the 24th, and i received word today that i need an arterial blood gas test and another night at the sleep lab because of some build up of carbon dioxide that showed up on my PFT. i only slept a total of 45 mins with the bi-pap last week, so they want to get a "setting for my machine before next friday.I just returned home from the blood gas test, and my sleep study is scheduled for next weds., the 22nd. Should i be worried they will postpone my surgery? They have ordered a sleeping pill to assure some results this time. thanks for any input......

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