edit: i just found out that the serum blood test for electrolyte is inaccurate cause only 1% in blood but they dont measure intracellular. too bad i cant get the test to measure intracellular ones so it left me confused if im deficient or not. i dont know how to put this and since im not a doctor but i hope people will understand what i mean people with knowledge could give an insight. id like to discuss about electrolyte test mainly blood electrolyte test but also open to other test. i was just wondering about blood electrolyte test. does the level on blood test really accurate to test if we have some electrolyte problem/imbalance. doesnt the electrolyte in blood need to be transfered to be use/in cell. it also reminds me about saliva vs blood test. is it possible if the level appears to be normal but we actually have some problem/defiency? the reason why i ask about this is because 1. the neurologist i went into said the calcium blood test could appear normal but the calcium use in nervous system could have problem 2. there are somethings that could block cellular intake such as beta blocker to potassium. 3. i also read on some sites stated blood test could appear normal but doesnt mean theres no problem but now i already forget the explanation. 4. i read here http://www.multibriefs.com/briefs/icim/SodiumPotassiumTesting.pdf that blood potassium lvl can be falsely elevated by a variety of circumstancessuch as if patient clenching, relaxing fist, if blood sample are delayed, if blood tubes are subjected to vigorous shaking or rough handling.