(i) Total serum magnesium concentration Filterable = 33% bound to proteins 25% bound to albumin and 8% to globulin
Unfilterable = 66% of which 92% is free and 8% is complexed to phosphate, citrate, or other compounds [14] (ii) Serum ionized Mg concentrate (iii) Total and free red blood cell Mg concentration (iv) Tissue Mg from muscle and bone (v) NMR for free Mg in tissues (research test) (vi) Magnesium retention test (research test) Table 3: Recommended dietary allowances (RDA) for magnesium in mg [15].