A standard CBC (complete blood count) looks at a number of things, including the number, shape, and size of your white and red blood cells, your iron levels, stuff like that. A comprehensive metabolic panel (CMP) checks your electrolytes (potassium, sodium, chloride, etc.). In people with co-existing conditions, this would make sense to do, just to get a baseline measurement. No biggie!
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Please always remember to consult your medical professional regarding your medical questions; this forum is intended to provide patient-to-patient support. Although some of us have healthcare backgrounds, we cannot diagnose or treat patients on the board.