Is fasting required for endoscopic ultrasound?

Nov 03, 2025 Source: Cainiu Health

Dr. Wang Lei

Introduction

In general, endoscopic ultrasound requires fasting. You should follow your doctor's instructions to refrain from eating and drinking before the procedure, typically fasting for 6–8 hours; the exact duration will be determined by your doctor. If you are currently taking medication, consult your doctor in advance regarding whether you need to temporarily stop taking it and for how long. After the procedure, wait until the numbing sensation in your throat has worn off before eating, and start with lukewarm or cool foods.

Under normal circumstances, endoscopic ultrasound requires fasting, with the specific analysis as follows:

After eating, residual food and gas in the gastrointestinal tract may interfere with ultrasound transmission, preventing the endoscope from clearly visualizing the gastrointestinal wall and surrounding organs, thus affecting the doctor's accurate assessment of any abnormalities. Additionally, food remaining in the stomach after eating may trigger nausea or vomiting during the procedure. In severe cases, this could lead to aspiration of vomit, causing coughing or even pulmonary infection. Fasting minimizes the likelihood of such complications and ensures the smooth progress of the examination.

Patients should follow medical instructions to fast and avoid drinking fluids before the exam, typically requiring 6–8 hours of fasting; however, the exact duration should be confirmed with the physician. If you are taking medications, consult your doctor in advance regarding whether they need to be paused and for how long. After the procedure, wait until the numbing sensation in the throat has worn off before resuming eating. Start with lukewarm, soft, and easily digestible foods, and avoid spicy, hard, or irritating foods. If persistent abdominal pain, vomiting blood, or other discomfort occurs after the exam, seek medical attention promptly.

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