The glomerular filtration of magnesium (Mg). Total serum Mg consists of ionized, complexed, and protein bound fractions, 60%, 7%, and 33% of total, respectively. The complexed Mg is bound to molecules such as citrate, oxalate, and phosphate. The ultrafil-terable Mg is the total of the ionized and complexed fractions. Normal total serum Mg is approximately 1.7 to 2.1 mg/dL (about 0.70-0.90 mmol/L) [1,2,7-9,11,12].

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