PTH and thyroiditis: It may also be linked to factors such as femalesex, body mass index (BMI), diabetes mellitus, serum parathyroid hormone (PTH) levels, thenumber of parathyroid glands identified and removed, thyroiditis, thyroid volume, lowpreoperative vitamin D levels, and previous bariatric surgery (4,5,6,7,8,9,10,11,12,13).