Before your Surgery at the Outpatient Surgery Center (OSC)

Diet Instructions

The evening before your surgery

At 10pm

  • STOP eating all solid foods and dairy products
  • STOP chewing gum and/or eating candy

After 10pm

  • While you are awake, you may drink one or two tall glasses of water, apple juice, black coffee or black tea every one to two hours.


For example, if you are told to arrive at the OSC at 7:45am, stop drinking at 5:45am.

If you are diabetic and feel symptoms of low blood sugar or your finger stick reading is low, please drink apple juice.

Approved list of clear liquids:

  • Water
  • Apple juice
  • Black coffee
  • Black tea


Please follow your instructions about eating and drinking. Otherwise, your surgery may be cancelled.

Pre-Surgery preparation

Pre-surgery preparation begins at your surgeon's office. If you need labs and an EKG before surgery, your surgeon will arrange these for you.

A registered nurse will call you two to seven days before your surgery for a phone interview. During this telephone interview, the nurse will review your medical history with you and tell you what you can expect at the OSC. An anesthesiologist will review your record and contact you if needed.

If you are scheduled to have your surgery done under local anesthesia (with a numbing medication injected at the surgical site and no medications for sedation), your medical history will be reviewed. You will be contacted to confirm allergies, site and side of your procedure and to answer any questions.

Making arrangements

  • In preparation for your surgery, if you smoke try to stop smoking. You will not be able to smoke while in the OSC. If you would like help with trying to stop smoking, call the Mass General Quit Smoking Service at 617-726-7443 or call the Massachusetts Smokers Helpline at 1-800-QUIT-NOW.
  • Arrange for a ride home. You are going home the same day of your surgery, and you MUST have a reliable adult take you home. We prefer that your ride remain at the OSC during your surgery. S/he can fill your prescriptions and listen to your post-operative instructions. Please be sure that your ride is 100% available to you for the day of surgery and has no other commitments. Our surgical schedule is subject to change, and this happens with some regularity. Your time could move up or be delayed.
  • Arrange for someone to stay with you for the first 24 hours.
  • Prepare your home for your return after surgery. Have shopping and laundry done. Prepare some meals ahead of time. Plan for car rides, as you may not be able to drive for a while.
  • If you have small children, dependent adults or animals that you care for, arrange to have someone help you watch them during the first few days after surgery.

Business day before your surgery

If you do not have a confirmed time for your surgery, please contact your surgeon's office in the afternoon on the day prior to surgery.

Evening before your surgery

It is very important that you are rested before your surgery. Try to sleep.

  • Write down the name and contact number of the person taking you home from the OSC. You will be asked for this information when you get to the OSC. If your ride is not with you when you check-in, we will need to confirm your ride prior to getting you ready for your procedure.
  • If you plan to have your prescriptions filled at the Mass General Waltham Pharmacy, you will need your drivers license, prescription insurance card and money or credit card.