en Bariatric Surgery Bariatric Surgery Letter/Editorial Letter/Editorial The aim of this study was to describe three neglected pregnancy at the time of bariatric surgery (BS) who had negative pregnancy test before surgery and underwent single-anastomosis gastric bypass surgery in obesity clinic in Rasoul-e-Akram Hospital, Iran University of Medical Sciences, Tehran, Iran.<br> The first case was a 38 years old woman with BMI of 47.1 suffering from nausea and vomiting one month after surgery that medical treatment did not work and it was found positive &beta;HCG test as and 13W + 6D fetus in sonography. The second case was a 30 years old woman with BMI of 46.2 suffering uterus bleeding four months after surgery. The third case was a 32 years old woman with BMI of 44.6 with suffering from resistant nausea and vomiting, epigastric pain, and delayed mense three month after surgery. These cases show the necessity of &beta;HCG test at the time of bariatric surgery for childbearing females. Bariatric Surgery, Pregnancy, βHCG test 45 52 http://annbsurg.iums.ac.ir/browse.php?a_code=A-10-71-1&slc_lang=en&sid=1 Abdolreza Pazouki 10031947532846001949 10031947532846001949 No Center of Excellence for Minimally Invasive Surgery Education, Iran University of Medical Sciences, Tehran, Iran. Center of Excellence of European Branch of International Federation for Surgery of Obesity. Somayeh Mokhber dr_so_mo@yahoo.com 10031947532846001950 10031947532846001950 No Minimally Invasive Surgery Research Center, Iran University of Medical Sciences, Tehran, Iran Seyed Mohammad Tabatabaee Jabali 10031947532846001951 10031947532846001951 No Department of pediatrics, School of Public Health, Iran University of Medical Sciences, Tehran, Iran Fatemeh Sadat Hoseini Baharanchi 10031947532846001952 10031947532846001952 No Minimally Invasive Surgery Research Center, Iran University of Medical Sciences, Tehran, Iran Fetemeh Saffari dr.fsafari01@gmail.com 10031947532846001953 10031947532846001953 Yes Minimally Invasive Surgery Research Center, Iran University of Medical Sciences, Tehran, Iran