Evaluation of vitamin B12 monitoring in patients on metformin in urban ambulatory care settings.

Background: Previous studies linked metformin use to vitamin B12 deficiency and demonstrated that the prevalence of vitamin B12 monitoring remains low.

Objective: This study aimed to assess the occurrence of monitoring vitamin B12 levels in a diverse population.

Methods: This was a retrospective chart review of adult patients with type 2 diabetes on metformin doses ≥ 1000 mg for ≥ 6 months at five Federally Qualified Health Centers (FQHC) and one Program of All-Inclusive Care for the Elderly (PACE).