en Bariatric Surgery Bariatric Surgery Brief communication Brief communication Background: Patients who undergo sleeve gastrectomy are at risk for micronutrient deficiencies. The aim of this study was to investigate the changes of serum 25OH-vitaminD level in obese patients after sleeve gastrectomy.<br> Methods: This retrospective study consisted of 952 patients (682 female and 272 male) who underwent bariatric surgery by a surgical team in Shiraz Mother and Child Hospital. Serum levels of 25OH-vitaminD before and three months after the surgery was evaluated. Results: the results indicated that the mean of serum 25OH-vitaminD level in women ranged from 15.65&plusmn;1.2 to 24.6&plusmn;1.98 (P value=0.05) and in men from 15.65&plusmn;1.2 to 26.72&plusmn;2.33 (P value=0.02).<br> Conclusions: Our findings shows that bariatric surgery contributed to improve vitamin D deficiency after 3 months in obese patients undergoing sleeve gastrectomy, which indicate that good follow-up after surgery, can lead to improving the level vitamin D serum. Sleeve gastrectomy, 25OH-vitaminD, Obesity 22 25 http://annbsurg.iums.ac.ir/browse.php?a_code=A-10-34-3&slc_lang=en&sid=1 Zahra Sobhani zahrasobhani120@yahoo.com 10031947532846001379 10031947532846001379 No Laparoscopy research center, Shiraz University of medical sciences, Shiraz, Iran. Masood Amini amini.mas2018@gmail.com 10031947532846001380 10031947532846001380 No Department of surgery, School of medicine, Laparoscopy research center, Shiraz university of medical sciences ,Shiraz ,Iran Seyedeh Sara Hashemi sara_hashemi@sums.ac.ir 10031947532846001381 10031947532846001381 No Burn and wound healing research center, Shiraz University of Medical Science, Shiraz, Iran. Leila Vafa vafa_obesityclinic@yahoo.com 10031947532846001382 10031947532846001382 No Obesity Prevention and Treatment Research Center, Shiraz University of Medical Sciences, Shiraz, Iran. Nader Moeinvaziri nmv1986@yahoo.com 10031947532846001383 10031947532846001383 Yes Department of surgery, School of medicine, Laparoscopy research center, Shiraz university of medical sciences ,Shiraz ,Iran Neda Haghighat neda.hag@gmail.com 10031947532846001384 10031947532846001384 No Laparoscopy research center, Shiraz University of medical sciences, Shiraz, Iran. Babak Hosseini babak1380@gmail.com 10031947532846001385 10031947532846001385 No Department of surgery, School of medicine, Laparoscopy research center, Shiraz university of medical sciences ,Shiraz ,Iran Afshin Zare zareafshin86@gmail.com 10031947532846001386 10031947532846001386 No Laparoscopy research center, Shiraz University of medical sciences, Shiraz, Iran.