Why aren't these two tests done before other types of surgery?

Just curious. What is it about WLS that requires me to have the PFT and a Sleep Study before surgery. I have had a few other surgeries and been heavy at the time, however never once has it been brought up? Seems to me like it should of been. I always tell the surgeon that I have asthma and that anesthetic makes me nauseous, but that's about it. I don't believe I have sleep apnea or any symptoms. I just found it strange that either they weren't careful enough before, or they are being extra careful now! Ever crossed anyone elses mind?

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