How to test for Magnesium Deficiency?

The right Magnesium test is called 'RBC Magnesium Test' and NOT! ‘Serum Magnesium Test’ or ‘Vollblut’ in German. There the right test is called 'Intraerythrozytär Magnesiumtest'. Serum Magnesium is worthless because just 1% of the body’s entire Magnesium is circulating in the blood stream the rest of this essential mineral is stored/hidden in your body tissue/bones/muscles/brain etc. and your clever body will do EVERYTHING to keep that 1% in your blood stream in balance because otherwise you will die from a heart attack in seconds.
Months, weeks, days before such a fatal event is going to take place the serum Magnesium level will even rise (body ‘steals’ it from the tissue and pumps it back in the blood stream), which is kind of your body’s LAST attempt to allow the heart muscle to relax after every contraction it performs and to prevent your death. Get tested!