Anemia and Related Nutrient Deficiencies after Roux-en-Y Gastric Bypass Surgery

Study characteristics; Proportion of study participants with anemia before and after RYGB surgery; Proportion of study participants with low ferritin/ serum iron/ vitamin B12/ folate level before and after RYGB surgery; Hemoglobin/Hematocrit level among study participants; Ferritin/ serum Iron/ vitamin B12/ folate level among study participants before and after RYGB surgery before and after RYGB surgery; Literature search and study selection; Forest plot for proportion of study participants with anemia before RYGB and 12 months after RYGB; Forest plot for proportion of study participants with (A) ferritin (B) serum iron (C) vitamin B12 and (D) folate deficiencies before RYGB and 12 months after RYGB; Funnel plot comparing log(mean) and s.e. of log(mean) for proportion of study participants with anemia 12 months after RYGB; MEDLINE (via PubMed) search query with ‘All Fields’; Cochrane Library search query with ‘Search All Text’