Laparoscopic sleeve gastrectomy (LSG) is an effective treatment for obesity. Pre and post bariatric surgery nutrient deficiencies exist commonly. Literature on this is scant in Asian populations. Our study aims to identify predictors for baseline anemia in an Asian bariatric population and compare anemia and related nutrient deficiencies at baseline and 1-year post LSG.


Retrospective analysis of 127 patients undergoing LSG at a tertiary institution in SGP between 2012 & 2018 was conducted. Patient demographics, hemoglobin, iron indices, vitamin B12 and folate levels were compared pre- and 1 year post-operatively. Analysis was also done to identify factors predicting for baseline anemia.


There were 79 females and 48 males. The mean age was 44.5 (±11.5) years with a mean pre-op BMI of 41.6 (±6.7) kg/m2. Females, age > 50, class I obesity were significant predictors for baseline anemia. Table 1 compares anemia and nutrient deficiencies at baseline and 1 year post-operatively. Iron deficiency was the most prevalent nutrient deficiency in patients with anemia. Post operatively the percentage patient with hemoglobin below 13g/dL increased significantly while percentage patients with deficiency in iron & B12 decreased. Table 2 shows a comparison of nutrient deficiencies in patients with anemia at baseline and 1 year post-operatively.


Patient aged over 50 years and females require more attention to supplement intake following bariatric surgery. Also, in the short-term iron and B12 deficiencies is seen to decrease.