by jimmylegs ?? Sun Mar 24, 2013 4:28 pm hi m i do think testing is the wisest thing to do. it really helps so that you know how far you have to go. as for specific tests, you can ask for 'serum zinc', and 'serum magnesium'. do not let the doc talk you into RBC tests.. yes RBC magnesium is supposed to be a better calibre of test but serum magnesium is pretty telling and comparable to lots of other