RBC potassium tests what is inside the red blood cells which is where potassium is stored. SERUM tests extracellular potassium which is where the body used it from to take it inside the RBC when that...
Actually there is a lab test for intracellular Potassium called an RBC Potassium test. I found this site looking for more information about my OWN issues as I have been on 120mEq potasisum for about 2...