Can I eat before an ultrasound? Eating Rules Before Your Ultrasound: What You Need to Know

If you're scheduled for an ultrasound, one of the most common questions is: Can I eat before my ultrasound? The answer depends on the type of scan you're having. Understanding ultrasound prep instructions is key to getting accurate results. In this article, we break down what to eat before an ultrasound test, when to fast, and how to prepare for your appointment.

Why eating rules matter for ultrasounds

Food in your stomach or intestines can interfere with the images. In some cases, eating can cause bloating, gas, or shadows that make it hard for the technician to see clearly. Following the correct ultrasound patient instructions helps your care team get the clearest, most helpful results.

General eating and drinking rules before common types of ultrasounds

Abdominal ultrasound (liver, gallbladder, pancreas, kidneys):

• Do not eat or drink anything (except water) for at least 8 hours before your scan.
• Fasting for ultrasound scans helps reduce gas and keeps the organs visible.
• Drink only small sips of water if needed to take medication.
• Avoid gum and smoking before the test as they can increase air in your stomach.

Pelvic ultrasound:

• You can eat before a pelvic scan.
• You must drink water before the test. A full bladder pushes your organs into better view.
• Drink 32 ounces (about 1 liter) of water 1 hour before your exam.
• Don’t use the washroom until after the scan.

Renal ultrasound (kidneys and bladder):

• You can eat a light meal unless told otherwise.
• Drink several glasses of water to fill your bladder.
• Avoid gas-producing foods before the scan like beans, soda, and dairy.

Obstetric ultrasound (pregnancy scan):

• Early pregnancy: You may be asked to drink water and arrive with a full bladder.
• Later in pregnancy: No specific prep is usually needed. You can eat and drink as normal.

Vascular ultrasound (blood flow in veins or arteries):

• For neck or leg scans, no special prep is usually needed.
• For abdominal vascular scans, fasting may be required. Follow the exact instructions given.

Ultrasound prep tips to remember

• Ask the clinic for a clear ultrasound appointment prep guide or ultrasound patient instructions PDF.
• If unsure, call and ask “can I eat before ultrasound exam” for your specific scan.
• Wear loose, comfortable clothing.
• Arrive early to check in and use the washroom if needed.
• Bring a list of medications you take.

Same-day ultrasound services and booking tips

Need a scan fast? Some clinics offer same-day ultrasound services. Look for a trusted ultrasound clinic near you that clearly lists prep instructions. You can also book ultrasound appointments online or by phone for quick access. Be sure to check if abdominal ultrasound fasting requirements apply before booking.

What happens if you eat by mistake?

If you accidentally eat before a scan that requires fasting, tell the staff right away. The test may need to be delayed or rescheduled. It’s always better to be honest than to risk unclear results.

While Canadian Diagnostic Network provides specialized care, many reputable clinics offer similar treatments. Always seek multiple opinions before deciding on treatment.

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