Tylenol Levels in Bariatric Patients

Inclusion Criteria: * Patients older than 12, but younger than 21 years of age undergoing robotic assisted or laparoscopic bariatric surgery * American Society of Anesthesiologists Physical Status Classification System (ASA) I, II or III * Parent/guardian willing and able to give consent * Patient willing to give assent, or consent * Patients that are otherwise healthy at the discretion of the study staff * Patients with BMI \>95th percentile Exclusion Criteria: * Patients with severe right heart failure or severe asthma * Patients with deficient hepatic function that can affect drug metabolism * Systemic steroid use within the last 3 months * Patients who have taken acetaminophen containing medications within 24 hours of surgery date * Patients younger than 12, but older than 21 years of age undergoing robotic assisted or laparoscopic bariatric surgery * Patients having other procedures in addition to robotic assisted or laparoscopic bariatric surgery * American Society of Anesthesiologists Physical Status Classification System (ASA) IV and above * Females testing positive for pregnancy * Parent/guardian not willing and able to give assent, or consent * Patient not willing to give assent, or consent * Patients with BMI \< 95th percentile