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| Since magnesium is mainly an intracellular ion, measurement of serum total magnesium is an inaccurate index of intracellular or total magnesium stores. Total Red Cell Magnesium. Although this test is becoming more available and the results are less variable than serum measurements, it may not adequately reflect total body magnesium status in health and disease. Serum Ionized Magnesium. The use of magnesium-specific, ion-selective electrodes to more accurately assess extracellular free magnesium levels is a promising new technology. The lack of routine availability of NMR has limited its clinical use so far. Sublingual magnesium assay. The 'Exatest' is a safe, non-invasive test that accurately measures the minerals inside cells. A doctor painlessly collects a sample from under your tongue and affixes it to a slide. It has been considered the most accurate test when renal function is normal. |
| Magnesium Requirement |