we have started something similar, calculating the creatinine clearance, and holding metformin for 48hours post procedure. it is still doc dependant if they want the hydration orders or not with the bicarb infusions. some just still go for the mucomyst , some want the mucomyst and hydration. why must protocols be so difficult? the docs don't check it , they think is standard, but actually they have to check it off if they want it, oh boy so much confusion. you would think also they could calculate the number themselves on their order sheet and do the orders right away if the number warrants it. but they leave it for nursing to do and call them back later . oh and did i mention often the crcl is not even calculated , but found in the middle of the night, pre procedure? that gets a 7am call to the doc in his car who doesn't even know the patient. great system.