Objective: This retrospective study aimed to investigate the clearance of magnesium (Mg) in peritoneal dialysis (PD) patients and its influencing factors. Methods: The demographic information, clinical characteristics and laboratory data of the patients were collected. According to the corrected serum Mg (cS-Mg) concentration, patients were divided into 3 groups including hypomagnesemia (Mg 2+ < 0.77 mmol/L, group A), normal serum Mg concentration (0.77 mmol/L ≤ Mg 2+ ≤1.03 mmol/L, group B),

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... hypermagnesemia (Mg 2+ > 1.03 mmo/L, group C). Results: One hundred and fifteen patients were enrolled, and their mean 24 h-peritoneal Mg clearance was 39.75 ± 17.42 mg. The mean normalized peritoneal Mg clearance rate was 1.82 ± 0.82 L/day/1.73 m 2 . Twenty-four-hour peritoneal Mg clearance of group A was significantly lower than that of group C (p < 0.05). Bivariate correlation analysis showed that cS-Mg was positively correlated with peritoneal dialysate Mg concentration (p < 0.01). cS-Mg was negatively correlated with the normalized peritoneal Mg clearance rate (p < 0.05). The normalized peri-