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Welcome to Just Answer. Normal potassium runs about 3.5-5.0 mEq/L. Anything below 3.5 mEq/L is considered low with a level of 2.5 to 3.5 mEq/L considered to be mild to moderately low. Some people still don't have symptoms at this level, but as it gets below 2.5, most people do. Low potassium levels can cause pain, nausea and vomiting, fainting, etc. The body needs potassium for so many processes. There are a lot of different causes of low potassium including use of diuretics, kidney failure, adrenal gland problem, and many more. Your doctors have ordered the scans to help try to determine why the potassium is low. They will be very closely checking your kidneys and adrenal glands because these are two areas that can cause low potassium content. Here is some more information about low potassium that you may find interesting. I hope this helps.