My kids were diagnosed with hand,foot,mouth 2 days before my lapband, and I still went through with surgery. I think they do ask you if you have symptoms of a flu or cold, but I didn't have any symptoms. And, they didn't take any blood or test me that morning. No complications, and I'm on day 3 post op. I just hope you have lots of support for sick kids and you....who will need support in doing many things!