Before surgery, you’ll go through a series of steps designed to make the procedure as safe as possible. Some happen weeks in advance, others the morning of. The process typically includes a medical evaluation, adjustments to your medications, fasting, and a final set of checks in the hospital’s preoperative holding area. Here’s what to expect at each stage.
The Preoperative Medical Evaluation
Somewhere between a few weeks and a few days before your surgery, you’ll have a preoperative appointment. This is where your surgical and anesthesia teams figure out your overall health and flag anything that could complicate the procedure. You’ll be asked about your full medical history, current medications (including vitamins and supplements), past reactions to anesthesia, allergies, and lifestyle factors like smoking and alcohol use.
Lab work and diagnostic tests aren’t automatic. Guidelines recommend ordering them only when your medical history, current medications, or the nature of the surgery call for it. A healthy 25-year-old having a minor procedure won’t need the same workup as a 70-year-old with diabetes and lung disease. Common tests, when needed, include blood counts, kidney function panels, electrolyte levels, urinalysis, and an electrocardiogram to check heart rhythm. Your doctor may also order chest X-rays or more specialized heart or lung function tests depending on the surgery’s complexity and your health profile.
During this visit, the anesthesia team assigns you a physical status score on a scale from 1 to 6. A score of 1 means you’re completely healthy. A score of 2 means you have a mild condition, like well-controlled reflux or a slightly elevated BMI. A score of 3 or higher reflects more significant health issues, such as severe obesity or poorly controlled diabetes, that increase the risk of complications. This classification helps guide decisions about the type of anesthesia you’ll receive and how closely you’ll need to be monitored.
Medication Changes in the Weeks Before
One of the most important preoperative steps is adjusting medications that affect bleeding. If you take a blood thinner like warfarin, you’ll typically stop it about 5 days before surgery to give your body time to restore normal clotting. Newer blood thinners work differently: some need to be stopped only 1 to 2 days ahead, while others require 2 to 4 days off before higher-risk procedures like spinal or heart surgery. Your surgeon’s office will give you a specific timeline.
Antiplatelet drugs like aspirin and clopidogrel irreversibly affect how your platelets work, so they often need to be stopped 7 to 10 days before surgery to fully clear the effect. Over-the-counter pain relievers like ibuprofen and naproxen also have a temporary antiplatelet effect and are usually stopped in advance as well. Herbal supplements, particularly garlic, ginkgo, and fish oil, can also thin the blood and should be mentioned during your preoperative visit so your team can advise you on when to stop.
Not all medications get paused. Blood pressure drugs, certain heart medications, and some others are often continued right up to the day of surgery. You’ll receive a specific list telling you which medications to take the morning of your procedure (usually with a small sip of water) and which to hold.
Fasting Rules
An empty stomach is critical for safe anesthesia. When you’re under general anesthesia, your normal reflexes that prevent stomach contents from entering your lungs are suppressed. If there’s food in your stomach, it can travel into your airway, a dangerous complication called aspiration.
The American Society of Anesthesiologists sets clear minimums. You can drink clear liquids (water, black coffee, apple juice, nothing with alcohol) up to 2 hours before your procedure. A light meal or non-dairy milk requires at least 6 hours of fasting. Fried foods, fatty foods, or meat may need 8 hours or more because they take longer to leave the stomach. Both the amount and type of food matter, so if you ate a large or heavy meal, err on the longer side.
For most morning surgeries, this means nothing to eat after midnight and only clear liquids until a couple of hours before your arrival time. Your surgical team will give you a specific cutoff.
Informed Consent
Before any surgery, you’ll sign a consent form. This isn’t just a formality. Your surgeon is required to explain the procedure itself, the risks and potential complications, the expected benefits, and any alternative treatments that exist. You should also be told what to expect if you choose not to have the surgery at all. You have the right to ask questions, and you can withdraw consent at any point, even after signing.
If your procedure is part of a research study or involves an experimental technique, additional disclosures are required, including information about compensation in the event of injury and a clear statement that your participation is voluntary. For standard surgeries, the conversation is simpler but still covers the key points: what’s being done, why, and what could go wrong.
What to Bring and What to Leave Home
On the day of surgery, wear loose, comfortable clothing that’s easy to change out of. You’ll be asked to remove everything, including underwear in most cases, and change into a hospital gown. All jewelry, hairpins, dentures, contact lenses, glasses, and dental bridgework need to come off. In some cases, the nursing staff will let you keep certain items, but plan on removing everything.
Bring your ID, insurance card, and a list of your current medications. Leave valuables at home. You’ll also need to arrange a ride, since you won’t be able to drive yourself after receiving anesthesia or sedation. For outpatient procedures, having someone stay with you for the first 12 to 24 hours at home is typically required.
What Happens in the Holding Area
Once you arrive and check in, you’ll be taken to the preoperative holding area. This is a space near the operating rooms, usually set up with curtained bays or small rooms. A nurse will check your vital signs (blood pressure, heart rate, temperature, oxygen level) and confirm your identity, the procedure you’re having, and the surgical site. If your surgery involves a specific side of the body, the surgeon will mark it with a pen while you’re awake so there’s a visible confirmation once you’re under anesthesia.
An IV line goes in during this time, usually in your hand or forearm. This is how you’ll receive fluids, anesthesia medications, antibiotics, and any other drugs needed during the procedure. The anesthesiologist or nurse anesthetist will visit you to review your health history one more time, explain the anesthesia plan, and answer last-minute questions. Your surgeon will also stop by to check in.
If you’re anxious, this is a good time to mention it. A mild sedative through your IV can take the edge off before you’re wheeled into the operating room. The holding area visit typically lasts 30 minutes to an hour, depending on the surgical schedule and whether any additional preparation is needed. Once everything is confirmed, you’re taken to the operating room, moved onto the surgical table, and the anesthesia team begins. Most people remember very little after the IV sedation starts.