Just because you CAN do it doesn't mean that it's safe. As an RT I have 4+ years of Cardiopulmonary Specific learning, I specialize in respiratory meds, the best way to deliver them, intubation, ABGs insertion of A-Lines, Nitric Oxide, heliox, O2, NIPPV, ventilators, PFT's, oscilators, Trachs etc etc. where you may have an extremely basic knowledge of these things, I have an extensive knowledge. If you are a BSRT, as I am-then you spend more classroom hours on this than doctors do in medical school. RT became what it is today because an RN couldn't handle it all, you couldn't then and you couldn't now. Or would you like to take over Xray and Lab, dietary, housekeeping etc etc? Because those too were born because a Nurse couldn't handle it all.