I agree that the data given is insufficient. If this was a 'real' patient, I would get more lab work but, with a scenario written on a piece of paper, you can just make assumptions.
Oh, how come I didn't tell that the potassium level was 2.9 mEq/L :/
I didn't get this scenario on the test but, of course, the comments helped me think better. I passed the test! Thanks a lot :redbeathe