Learn About Preparing For Your Endoscopy

Understanding What an Endoscopy Is and Why Doctors Perform Them

An endoscopy is a medical procedure where a doctor uses a thin, flexible tube with a camera on the end to look inside your body. The tube, called an endoscope, allows the doctor to see areas that cannot be examined during a regular physical exam. Depending on which part of your body needs examination, endoscopies have different names. An upper endoscopy examines your esophagus, stomach, and small intestine. A colonoscopy looks at your large intestine and colon. A bronchoscopy examines your lungs and airways.

Doctors recommend endoscopies for many different reasons. According to the American College of Gastroenterology, colonoscopies are used to screen for colorectal cancer in adults over 45 years old, or earlier if you have risk factors. Upper endoscopies can diagnose reasons for difficulty swallowing, persistent heartburn, stomach pain, or bleeding in the digestive tract. Bronchoscopies help doctors diagnose lung infections, remove foreign objects, or take tissue samples when lung cancer is suspected.

The procedure itself typically takes between 15 and 45 minutes, depending on the type and what the doctor needs to do. During the procedure, you will receive medication to help you relax, though you will usually remain conscious. The doctor may remove tissue samples, called biopsies, or perform minor treatments during the same procedure. Most endoscopies are outpatient procedures, meaning you go home the same day.

Understanding why your doctor recommended an endoscopy helps you feel more prepared. Ask your doctor which type of endoscopy you are having and what they specifically want to examine. Write down the reason for your procedure and any questions you have. This information will help you understand what to expect and why the preparation steps matter.

Dietary Restrictions Before Your Endoscopy Procedure

One of the most important parts of preparing for an endoscopy involves changing what you eat and drink in the days before your procedure. Your doctor needs a clear view inside your body, which means your digestive system must be empty or clean. Different types of endoscopies have different dietary requirements, so follow the specific instructions your doctor's office provides.

For an upper endoscopy, you typically cannot eat or drink anything for 6 to 8 hours before the procedure. Most doctors schedule these procedures in the morning so you can stop eating and drinking the night before. You may drink clear liquids until 2 to 4 hours before the procedure, depending on your doctor's instructions. Clear liquids include water, clear broth, apple juice, and tea without milk.

Colonoscopies require more extensive preparation because the entire colon needs to be empty and clean. Most doctors ask patients to follow a clear liquid diet for 1 to 2 days before the procedure. This means avoiding all solid foods and drinking only clear liquids like water, clear juice, broth, and sports drinks. You must also avoid red, purple, and blue liquids because they can stain the colon and make it harder for the doctor to see. Additionally, you will need to use a bowel prep solution, which is a strong laxative that causes multiple bowel movements to empty your colon completely. This process typically begins the evening before your procedure and continues until your stool becomes clear.

Keep a written list of what you can and cannot eat before your procedure. About one week before your appointment, stop eating high-fiber foods like whole grains, nuts, seeds, and raw vegetables. Two to three days before your procedure, transition to low-fiber foods like white bread, chicken, and fish. The day before, switch to clear liquids only. Having this schedule written down prevents confusion and helps you stay on track.

Medications and Supplements: What to Stop and What to Continue

Many people take medications regularly, and you need to know which ones to keep taking and which ones to pause before an endoscopy. Different medications interact differently with endoscopy preparation and sedation, so your doctor's office should provide specific instructions about your medications. Do not stop taking any medication without talking to your doctor first, because some medications are important for your health and should not be interrupted.

Blood thinning medications require special attention. If you take warfarin, apixaban, dabigatran, or rivaroxaban, you may need to stop these medications a few days before your endoscopy. However, some patients need to continue these medications because the risk of blood clots is greater than the risk of bleeding during an endoscopy. Your doctor will give you specific instructions based on why you take the medication and what type of endoscopy you are having. Never stop blood thinners without speaking to both your primary care doctor and the doctor performing your endoscopy.

Aspirin and nonsteroidal anti-inflammatory drugs like ibuprofen may need to be stopped 5 to 7 days before your procedure, especially if you are having a procedure where tissue removal is planned. Diabetes medications usually need adjustment on the day of your procedure because you will not be eating. If you take insulin or oral diabetes medication, ask your doctor whether to take your normal dose or a reduced dose the morning of your procedure. Iron supplements should be stopped 3 to 5 days before a colonoscopy because they can affect the doctor's view.

Create a detailed medication list by writing down every medication, supplement, and vitamin you take, including the dose and how often you take it. Bring this list to your appointment at least one week before your procedure. Your doctor's office may ask you to bring the actual bottles so they can verify the exact medications and doses. This prevents medication errors and helps your doctor make informed decisions about what to continue and what to pause.

Physical Preparations and Practical Arrangements Before Your Appointment

The day and week before your endoscopy involve physical preparations beyond just changing your diet. You need to arrange practical details like transportation, time off work, and what to wear. Since you will receive sedation during most endoscopies, you cannot drive yourself home afterward. Arrange for someone you trust—a family member or friend—to pick you up and stay with you for the rest of the day. The sedation used during endoscopies can affect your judgment and coordination for several hours, so driving or operating machinery is unsafe.

Plan to take the day of your procedure off work. Most endoscopies take 30 to 60 minutes from the time you arrive at the medical facility until you are ready to leave, but you should allow additional time for check-in, pre-procedure instructions, and recovery. You will need time to rest after the procedure and should not return to work that day. If your procedure is scheduled for the afternoon, you might take only a half day off. If it is scheduled for the morning, plan to be away from work for the full day.

Wear comfortable, loose-fitting clothing that is easy to remove. You will change into a hospital gown for the procedure, so wear clothes that you can change out of quickly. Avoid wearing jewelry, including rings and watches, as these must be removed before the procedure. If you have long fingernails or false nails, discuss this with your doctor's office, as they may need to be removed to monitor your oxygen levels during the procedure. Some facilities ask you to shower the night before a colonoscopy as part of the preparation process.

The evening before your procedure, prepare your home for your recovery. Stock your refrigerator with soft foods like yogurt, pudding, soup, and applesauce for the day after your procedure. Clear your schedule for rest time—you should plan to relax at home for the remainder of the day. Arrange your work and personal responsibilities so someone else can handle them if needed. Some people benefit from having a list of phone numbers for their doctor's office and the medical facility in case they have questions the day before or day of their appointment.

The Bowel Prep Process: Understanding and Using Prep Solutions

For colonoscopies, the bowel preparation process is crucial and requires understanding how to use the prescribed prep solution correctly. The bowel prep solution is a liquid medication that causes your intestines to empty completely. This is the most important part of colonoscopy preparation because if your colon is not completely clean, the doctor may not see all polyps or abnormal tissue, which could miss important findings. According to the American College of Gastroenterology, inadequate bowel prep occurs in about 25 percent of colonoscopies, and it is often the reason procedures need to be repeated.

Your doctor's office will prescribe a specific bowel prep solution