Can blood work tell the difference in smoking and patches?

I know that I was supposed to quit a month before surgery, but now it is 2 days before my pre-op testing and 7 days before my surgery, if I wear patches for the next seven days, will the tests show me as a smoker or just on the patch? I read on the Red Cross website that after 24 hours all carbon monoxide was out of the body and nicotine was out after 12 hours. My dr. thinks that I am on the patches, just not smoking. Please help! Can't afford to have surgery postponed, I financially can't afford to RE-meet my deductible! Thanks in advance!

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