How to Actually Prepare for Outpatient Surgery (Not Just the Day Before)

I've worked in perioperative care for eleven years. In that time, I've watched hundreds of patients come in for outpatient procedures — and I've noticed a consistent pattern: the patients who do the best are almost never the ones who did the most research the night before. They're the ones who started preparing two weeks out.

The standard pre-op instructions you get from most facilities cover the basics: don't eat after midnight, bring your ID and insurance card, arrange a ride. That information is correct and important. But it's about 30% of what you actually need to know.

Here's the rest of it.

Two weeks before: the stuff that actually matters

The most consequential prep happens before most patients have even started thinking about surgery day. The two most important things to do two weeks out: review your medications with your surgeon, and verify your insurance authorization.

On medications — blood thinners, NSAIDs (ibuprofen, naproxen, aspirin), fish oil, vitamin E, and several other common supplements all need to be stopped before surgery. Most of these have a 7–10 day washout window. If you're still taking ibuprofen for a sore back three days before your procedure, that's a problem. Get an explicit list from your surgeon's office of what to stop and when.

On insurance — call your insurer and confirm that prior authorization has been approved for your specific procedure at your specific facility. Ask for the authorization number. Don't assume your surgeon's office handled it. They usually do, but not always, and finding out the day before surgery that authorization was never submitted is genuinely awful.

Set up your recovery space before you leave

This sounds obvious but almost nobody does it. If you're having a knee procedure or any lower extremity surgery, set up a recovery station on the floor where you'll be spending most of your time — within arm's reach of medications, water, a phone charger, ice packs, and a TV remote. If you live in a two-story house and your bedroom is upstairs, consider sleeping downstairs for the first few days. Climbing stairs post-op on narcotics with a swollen knee is not a good situation.

Fill your post-op prescriptions before surgery, not after. Most surgeons will call them in ahead of time. Pick them up. The last thing your spouse or family member needs to do on the afternoon of your surgery is drive to a pharmacy.

The night before: what most guides get wrong

Standard advice says nothing after midnight. The actual American Society of Anesthesiologists guidelines say no solid food within 6–8 hours and no clear liquids within 2 hours of your procedure time. Your facility's instructions take precedence over the general rule — but the point is that the cutoff is tied to your procedure time, not midnight.

If your procedure is at 2pm, 'nothing after midnight' means you've been fasting for 14 hours by the time you're on the table. That's unnecessarily long and leaves some patients hypoglycemic and miserable. Read your facility's instructions carefully. If they say nothing after midnight and your procedure is in the afternoon, it's worth calling to ask if clear liquids are permitted until 2 hours before.

What you should definitely do the night before: shower with antibacterial soap if your facility provided CHG (chlorhexidine) wipes or wash — it reduces surgical site infection risk meaningfully. Lay out everything you're bringing. Confirm your driver.

Morning of: the things people forget

Remove nail polish. I've seen procedures delayed for this. The pulse oximeter goes on your finger and reads through the nail — dark or gel polish interferes with the reading. Remove it the night before.

Take only the medications your surgeon explicitly said to take the morning of surgery, with a small sip of water. Don't take NSAIDs. Don't take supplements. For daily medications like blood pressure, thyroid, or seizure medications, you usually do take them — but confirm with your surgeon. If this wasn't discussed, call the office before you leave.

Your driver needs to be there before you go in, not just available to come pick you up. Most facilities will confirm your ride is present before your procedure begins. If your ride is planning to drop you off and come back, call ahead and confirm that's acceptable — many facilities require them to stay.

One last thing: write down your questions before you arrive. You'll meet your anesthesiologist, your surgeon will do a pre-op check-in, and a nurse will ask if you have any questions. If you have concerns about anesthesia, pain management, the procedure itself, or recovery — that's the time to ask. Once you're in the OR it's too late.