Yes. Boardsjohn just posted he has just had one done, so I bet he can tell you all about it. From what I've heard, it's like a sobriety test; just breathe into the tube and that's it. The machine does the rest by figuring out what levels of what gases you are expelling; bad bacteria fart gas that good bacteria doesn't. If you have too much bad gas, you have too many bad bacteria. Pretty simple, really!