I am a Respiratory Therapist. One of the things that I do is draw the ABG's. In all honesty it depends on you and the RT that draws you. What the other person commented is pretty much what I find to be the case with the exception of the lidocaine. You can ask for it, but it is not common practice to use it. I have never seen it used, but most patients I perform ABG's on are in a critical setting in the hospital. An ABG is a very important tool that is used to check your pH, CaO2, PaO2, and HCO3. The doctor can assess your oxygenation, ventilation, and tell if you are having metabolic or respiratory issues. Depending on what your issues are, if they think it is important to check any of those things I mentioned, I would say go for it. You can google indications for an ABG if you want to be certain you fall into the category for it being necessary. Best of luck.