Hypernatremia

Your most important tool here is going to be your history and your physical. I've rarely had a case of hypernatremia where the answer is to why it occurred was not apparent after getting the history. If we knew her urine output and those labs, specifically the urine sodium and potassium, we could get an estimate of her urinary free water loss. So similar to hyponatremia if this is acute which again it rarely is in these cases. You'll want to be a little bit more cautious if it's chronic.