Magnesium
| Magnesium | |
| MAG, Mg2+ | |
| Serum (brown), Plasma (orange) | |
| 8hrs | |
| This assay is used for diagnosing and monitoring hypomagnesaemia (magnesium deficiency) and hypermagnesaemia (magnesium excess). Hypomagnesaemia may be a cause of inappropriately low PTH levels to its role as a co-factor in the hormones synthesis. | |
| The magnesium assay is not available on haemolysed samples. Samples contaminated with EDTA (from FBC bottles) will show falsely low levels. In plasma about 70 % of magnesium present in free form while the other 30 % is bound to proteins (especially albumin), citrates, phosphate, and other complex formers. Hence low levels can be seen in hypoalbuminaemia. |
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• <28 days: 0.60-1.00 mmol/L • ≥28 days: 0.70-1.00 mmol/L |
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| Analytical error [1] | 2.0% |
| Reference change value [1] | 11.4% |
