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Table 2 Published articles reporting vitamin B12 deficiency

From: An audit to determine if vitamin b12 supplementation is necessary after sleeve gastrectomy

Authors Vitamin B 12 Folate Zinc Ferritin Iron
Gehrer S. et al (Gehrer et al. 2010) Total (n) 50 50 50 - 50
  Deficiency n (%) 18% 22% 34% NR 18%
  Abnormal level <150 pmol/l <6 nmol/l <11.5 μmol/l   <30 ng/ml
Toh S.Y. et al (Toh et al. 2009) Total (n) 9 5 - 9 9
  Deficiency n (%) 0% 0% NR 0% 11%
  Abnormal level <145pmol/l <7nmol/l   <15μg/l <9μmol/l
Aarts E.O. et al (Aarts et al. 2011) Total (n) 60 60 - - 60
  Deficiency n (%) 9% 15% NR NR 43%
  Abnormal level <150pmol/l <9nmol/l    <9μmol/l
Hakeam A.H. et al (Hakeam et al. 2009) Total (n) 61 61 - 61 61
  Deficiency n (%) 19.6% 6.5% NR 1.6 % 4.9%
  Abnormal level <145pmol/l <776 nmol/l   Male <30μg/l <8μmol/l
      Female<13μg/l  
Kehagias I. et al (Kehagias et al. 2011) Total (n) 28 28 - 28 28
  Deficiency n (%) 4% 0% NR 18% 18%
  Abnormal level <200pg/ml <1.5ng/ml   <9ng/ml <50mg
  1. NR= not reported in the study.