Comparison of two methods for measuring 25-OH vitamin D in the follow-up of patients after bilio-pancreatic diversion bariatric surgery

Despite the apparent good agreement between the Roche method and LC-MS/MS in the healthy subjects group and in the post-DBP D3-supplemented patient group, a considerable bias seems to exist, particularly in the presence of D2. The LC-MS/MS method is therefore the most accurate method to follow the vitamin D2 -supplemented bariatric population.