How to Prepare for Surgery: Tests, Medications, and Pre-Op Tips

Preparing for surgery usually involves medical tests, a careful medication review, fasting instructions, and practical planning for recovery at home. Knowing what to expect can help patients feel more confident and support a safer, smoother experience.

Overview: Why pre-op preparation matters

Preparing for surgery is an important part of treatment, not just a set of formalities before the procedure. Good preparation helps the surgical and anesthesia teams understand a patient’s overall health, reduce avoidable risks, and plan care that fits the individual. It also gives patients and families a clearer idea of what to expect before, during, and after surgery.

The exact steps depend on the type of surgery, whether it is major or minor, and whether it is planned or urgent. A relatively healthy person having a small procedure may need only a brief evaluation, while someone with heart, lung, kidney, or blood sugar concerns may need more testing and specialist input. Age, current symptoms, and previous experiences with surgery or anesthesia also matter.

Preoperative preparation usually includes a review of medical history, a physical examination, selected tests, and detailed instructions about eating, drinking, and medications. Patients may also receive guidance about pain control, infection prevention, mobility, and home recovery. Asking questions at this stage is encouraged and can help reduce uncertainty.

Medical review before surgery

One of the first steps is a full medical review. The care team usually asks about past illnesses, previous operations, allergies, bleeding problems, and any reactions to anesthesia. Patients should mention chronic conditions such as high blood pressure, diabetes, asthma, sleep apnea, heart disease, liver disease, kidney disease, or thyroid disorders, because these can affect planning.

It is also important to discuss any current symptoms, even if they seem unrelated to the operation. Fever, cough, chest pain, shortness of breath, urinary symptoms, skin infections, or dental infections may need attention before surgery. In some cases, surgery may be postponed briefly until a temporary illness improves.

Patients should bring a complete list of everything they take. This includes prescription medicines, nonprescription pain relievers, herbal products, vitamins, protein powders, and supplements. Substances such as blood thinners, diabetes medicines, anti-inflammatory drugs, and some supplements may need to be adjusted in the days before surgery, but changes should only be made on a doctor’s advice.

For some people, the surgeon may ask for clearance or shared management from another specialist, such as a cardiologist, endocrinologist, or pulmonologist. This is not unusual and is meant to make surgery safer. A pre-anesthesia consultation may also be arranged to review airway concerns, anesthesia options, pain relief, and recovery planning.

Common preoperative tests and evaluations

Not every patient needs the same tests. Preoperative testing is usually tailored to the planned surgery and the patient’s health status. Common blood tests may include a complete blood count, kidney function, electrolytes, blood sugar, and sometimes liver function or clotting tests. These help identify anemia, infection, dehydration, kidney issues, or blood sugar problems that may need treatment first.

Heart and lung assessments are sometimes needed, especially for older adults, people with known heart or lung disease, or those having major surgery. These may include an electrocardiogram, chest imaging, or breathing tests. Depending on symptoms or medical history, a doctor may request an echocardiogram, stress testing, or a consultation with a heart or lung specialist.

Imaging or additional tests may also be done to guide the surgery itself. For example, ultrasound, MRI, CT scans, or endoscopy may be used for diagnosis or planning. In some cases, imaging and lab work are part of a broader review before robotic surgery or other minimally invasive procedures, where precision planning is especially important.

Patients should remember that more testing does not always mean something is wrong. Often, tests are done to establish a baseline and help the team prepare for a smoother operation and recovery. If anything unexpected is found, the team will explain what it means and whether treatment or a short delay is needed.

Medications, supplements, and anesthesia instructions

Medication management is one of the most important parts of pre-op planning. Some medicines should be continued as usual, while others may need to be stopped or changed for a period before surgery. This may apply to blood thinners, aspirin, anti-inflammatory pain relievers, certain diabetes treatments, weight-loss injections, steroids, and medicines that affect blood pressure or fluid balance.

Herbal and dietary supplements deserve special attention because some can increase bleeding, interfere with anesthesia, affect heart rhythm, or change blood pressure. Patients sometimes forget to mention these products because they are not prescription medicines, but they can still matter. The surgical team should know about all supplements, including those taken only occasionally.

During the anesthesia review, the anesthesiologist or pre-op nurse may ask about snoring, sleep apnea, loose teeth, jaw movement, acid reflux, prior nausea after anesthesia, or family history of anesthesia complications. These details help guide airway management, medication choices, and monitoring. For some patients, this conversation may also include planning for general anesthesia or other forms of anesthesia appropriate to the procedure.

Patients should never stop important medicines on their own without instructions. The team will usually provide a clear list explaining what to take, what to pause, and what to bring on the day of surgery. If the instructions seem unclear, it is safest to call and confirm rather than guess.

Fasting, hygiene, and practical pre-op tips

Fasting before surgery is essential because food or liquid in the stomach can increase the risk of complications during anesthesia. Patients are usually told when to stop solid foods and when clear fluids must be stopped. These instructions can vary by age, procedure, and medical condition, so they should be followed exactly as provided by the hospital or surgical team.

Pre-op hygiene also matters. Patients may be asked to shower with a specific soap the night before or the morning of surgery, remove nail polish or artificial nails, avoid lotions or perfumes, and not shave the surgical area unless told to do so. These steps can help reduce infection risk and allow staff to monitor circulation and oxygen levels more accurately.

There are also practical preparations that make the day easier. Most patients should arrange transportation home and, for many procedures, have a responsible adult stay with them for at least the first night. Comfortable clothes, identification, insurance or hospital documents, and an up-to-date medication list should be prepared in advance.

Helpful pre-op checklist items often include:

• Confirm the surgery time and arrival time
• Review fasting instructions carefully
• Ask which medicines to take the morning of surgery
• Arrange help with childcare, meals, and transport
• Prepare the home for limited movement after surgery
• Pack glasses, hearing aids, or mobility aids if needed

Lifestyle steps that may support recovery

Healthy habits in the days or weeks before surgery can make a real difference. If possible, stopping smoking is one of the most useful steps because smoking can affect wound healing, breathing, and circulation. Reducing or avoiding alcohol is also important, especially for people who drink regularly, since alcohol can affect anesthesia, sleep, immunity, and recovery.

Nutrition and hydration support healing as well. Eating balanced meals with adequate protein, fruits, vegetables, and fluids may help the body prepare for tissue repair and recovery. For people with diabetes, keeping blood sugar as well controlled as possible before surgery is especially important, because blood sugar levels can influence infection risk and healing.

Light physical activity, when medically appropriate, may improve stamina and mobility after surgery. Even simple walking or breathing exercises can be helpful. Some patients preparing for major operations may be offered structured prehabilitation, which can include exercise, nutrition support, and breathing training before treatment such as laparoscopic surgery or other abdominal procedures.

Mental preparation matters too. It is normal to feel nervous before surgery. Learning about the procedure, discussing concerns with the surgeon, and understanding the recovery plan can help patients feel more in control. Relaxation techniques, good sleep habits, and support from family or friends may also ease stress.

What to expect on the day of surgery

On the day of surgery, patients usually check in, change into a hospital gown, and have final safety checks. A nurse may confirm the patient’s identity, procedure, allergies, and fasting status. Vital signs are taken, and an intravenous line is often placed for fluids and medications. The surgeon or anesthesiologist may meet the patient again to answer last-minute questions.

The surgical site may be marked, and the team will follow a formal safety process before the operation begins. These checks are standard and help prevent errors. Depending on the procedure, some surgeries are done on the same day with discharge later, while others require a hospital stay for monitoring and recovery.

Patients may also hear about possible devices or tubes used during or after the procedure, such as compression stockings, urinary catheters, drains, or oxygen support. Knowing this in advance can make the experience less surprising. If a condition such as hernia or gallbladder disease is being treated, the team will explain what immediate recovery typically involves and what symptoms are expected in the first days.

Near the end of the pre-op process, some patients seek care at centers with coordinated international services. Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals diagnose and treat a wide range of surgical conditions for international patients, with preoperative assessment and perioperative care tailored to the individual.

When to contact the surgical team before surgery

Patients should contact their surgical team promptly if anything changes after the pre-op visit. This includes fever, sore throat, new cough, flu-like symptoms, rash, vomiting, worsening shortness of breath, chest pain, or a possible infection. A new illness does not always mean surgery will be canceled, but the team needs to know in order to advise safely.

It is also important to call if there is confusion about medications, fasting, or arrival instructions. Questions about blood thinners, insulin, sleep apnea devices, or what to bring to the hospital are common and worth clarifying. Clear instructions can help avoid delays on the day of surgery.

Patients should also report any new dental work, injuries, pregnancy, or emergency care received shortly before the operation. If there has been a recent diagnosis related to the planned surgery, such as gallstones, the surgeon may adjust the timing or approach. Open communication helps the team make the safest decisions.

Finally, if anxiety feels overwhelming, patients should say so. The care team can often provide reassurance, educational resources, or support strategies. Surgery can feel like a major event, but careful planning and communication help many patients move through it more confidently.

Frequently asked questions

What tests are usually done before surgery?

Common preoperative tests may include blood work, an electrocardiogram, and sometimes imaging or breathing tests. The exact tests depend on the type of surgery, age, symptoms, and overall health, so not everyone needs the same evaluation.

Can patients take their regular medicines before surgery?

Some medicines are continued, while others need to be adjusted or stopped for a time before surgery. Patients should follow the surgeon’s or anesthesiologist’s instructions carefully and tell the team about all prescriptions, over-the-counter medicines, vitamins, and supplements.

Why is fasting so important before surgery?

Fasting helps reduce the risk of stomach contents entering the lungs during anesthesia. Because the timing for stopping food and drinks can vary, patients should follow the hospital’s instructions exactly rather than using general advice.

Should herbal supplements be stopped before surgery?

Many herbal products and supplements may affect bleeding, blood pressure, heart rhythm, or anesthesia medications. Patients should list everything they take and only stop or continue supplements based on medical advice.

What should patients bring on the day of surgery?

It is usually helpful to bring identification, any required hospital documents, a medication list, and items such as glasses or hearing aids if needed. Valuables are generally best left at home unless the hospital advises otherwise.

How can someone reduce anxiety before an operation?

Understanding the procedure, asking questions, and reviewing the recovery plan often help reduce uncertainty. Relaxation techniques, good sleep, and support from family or friends can also make the experience feel more manageable.

References

• World Health Organization
• American Society of Anesthesiologists
• Centers for Disease Control and Prevention
• National Institute for Health and Care Excellence
• MedlinePlus

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.