Hi there, I am not certain that having a positive marijuana test result would necessarily result in your surgeon rescheduling the procedure, as the policies for positive drug screens are surgeon and anesthesiologist dependent. If you used marijuana very recently, it is likely that any drug screen done before the procedure would be positive for this. However, it is not even certain that your surgeon would do a drug screen on you prior to your procedure. Since there is doctor-patient confidentiality between you and your surgeon, I would recommend reaching out to him or her to ask whether or not a drug screen would be done before your surgery, and if positive for marijuana, whether or not you would need to reschedule your operation or if he or she feels comfortable performing the procedure at that point. I hope my answer is helpful to you.