Surgery and hospital stay are known to trigger gout attacks in 20%~86% (?) of the gout patients. Fasting and rapid weight loss (and the results of gastric bypass?) are also known to trigger gout attacks. Therefore, gastric bypass patients seem to be facing with double whammy from the procedure. I have not read any report in this regard. The following are my unqualified thoughts about what I would do:
before surgery:
1) keep taking allopurinol to lower and stabilize the blood uric acid level.
2) start taking colchicine a few weeks pre-op to prevent possible attack. (you will be prohibited from taking nsaids 10 days or so pre-op & post-op to prevent excess bleeding & hematosis.
After surgery
1) treat myself as if there is a gout attack for a week or two without using nsaids (and baking soda?)
2) go on high purine diet post-op to stabilize the blood uric acid level to reduce the chance of gout attacks.
I suggest you discuss the problem with your doctor and the surgeon for advice. Would you pass it on to us? Thanks and good luck.