Seen in ER for foot pain told ok go home no blood work 36 hrs later had a bka 4 gas gangren and sepsis is this normal or just over looked???

Complex. Not having seen the foot or knowing the background, it is impossible to effectively comment on the appropriateness of the initial ER evaluation. All hospitals have patient relations departments and peer review processes looking at clinical care. I would start by speaking about it with your surgeon, then go to the patient relations dept if you needed.