where is most magnesium reabsorption
Normally, only 3% of filtered magnesium appears in urine; thus, 97% is reabsorbed by the renal tubules. In contrast to sodium and calcium, only approximately 25-30% of filtered magnesium is reabsorbed in the proximal tubule.pproximately 60-65% of filtered magnesium is reabsorbed in the thick ascending loop of Henle and 5% is reabsorbed in the distal nephron. Relatively little is known about cellular magnesium transport mechanisms.