Hyperoxaluria Is a Long-Term Consequence of Roux-en-Y Gastric Bypass: A 2-Year Prospective Longitudinal Study

Abstract

RYGB is associated with a long-term increase in urinary oxalate excretion and decrease in urinary citrate excretion. Although calcium oxalate relative supersaturation increases early in the postoperative period, this returns to baseline with long-term follow-up. These data suggest that patients who have undergone RYGB are at risk for oxalate nephropathy developing.