How to prepare for an ultrasound? Ultrasound Prep 101: How to Get Ready for Your Appointment

If you’ve booked an ultrasound scan, you might be wondering what to expect and how to get ready. Whether it’s your first time or you’ve had one before, knowing what to do before your appointment can help things go smoothly. This ultrasound preparation guide will walk you through exactly how to prepare for an ultrasound scan—what to eat, wear, and bring—so you feel confident and ready.

What is an ultrasound scan and why is prep important?

Ultrasound is a safe and painless form of diagnostic imaging that uses sound waves to take pictures inside your body. How you prepare depends on the type of scan you’re having. Some ultrasounds require a full bladder, others need fasting, and some don’t require any special prep at all.

General ultrasound appointment prep tips

These tips apply to most types of ultrasounds unless your doctor gives you specific instructions:

• Wear loose, comfortable clothing
• Avoid wearing jewelry over the scan area
• Bring your health card and any referral paperwork
• Arrive 10–15 minutes early
• If you’re unsure about prep instructions, call the clinic ahead of time

How to prepare for different types of ultrasound scans

Abdominal ultrasound

• Do not eat or drink anything (except water) for 8 hours before your appointment
• Avoid fatty foods the night before
• Take prescribed medications with water unless told otherwise
• This helps reduce gas in your stomach for clearer images

Pelvic ultrasound

• Drink 32 ounces (about 1 liter) of water one hour before your appointment
• Do not use the washroom until after your scan
• A full bladder lifts the uterus and bladder for better viewing

Obstetric (pregnancy) ultrasound

• Early pregnancy: Follow pelvic ultrasound prep with a full bladder
• Later in pregnancy: You may not need a full bladder—ask your provider
• Wear two-piece clothing for easy access to your abdomen

Doppler ultrasound (blood flow check)

• Usually no prep required unless instructed
• Wear sleeves that roll up easily if checking arms or legs
• Stay still during the scan to help get accurate blood flow readings

What to bring to an ultrasound appointment

• Health card or ID
• Any ultrasound preparation instructions you were given
• A list of current medications
• Your appointment confirmation
• Something to read or do in case you wait a few minutes

Fasting before an ultrasound scan: when is it necessary?

You may be asked to fast before an abdominal ultrasound. Fasting helps reduce gas and food in the stomach that can block the view of internal organs. Always follow your specific prep instructions. If you’re unsure whether you need to fast, contact your clinic.

Ultrasound preparation instructions: common do’s and don’ts

Do:

• Follow all instructions exactly
• Ask questions if anything is unclear
• Stay hydrated unless fasting is required
• Relax during the scan—it’s safe and non-invasive

Don’t:

• Skip the full bladder requirement for pelvic scans
• Eat or drink if you’ve been told to fast
• Arrive late or unprepared
• Wear tight or difficult-to-remove clothing

Medical imaging appointment checklist

To keep your visit stress-free, use this simple checklist:

• -Confirm your appointment
• -Follow any fasting or drinking instructions
• -Wear loose, easy-to-remove clothing
• -Bring ID, referral forms, and insurance (if needed)
• -Know what kind of ultrasound scan you are having
• -Call ahead if you’re unsure about how to prepare

How to book an ultrasound scan online or by phone

Most diagnostic imaging centers, including those in Ottawa, allow you to book ultrasound scans online or over the phone. Be sure to mention the reason for your ultrasound so they can give the correct prep instructions.

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

Whether you’re preparing for a pelvic scan, an abdominal ultrasound, or another type of medical imaging, knowing how to prepare for an ultrasound scan will help you feel at ease. Follow the steps above and your appointment will be quick, comfortable, and accurate.

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