Prep checklist

Scan-day preparation, by scan type

Full bladder, empty stomach, or come as you are: preparation depends entirely on which scan you are having. Pick yours, tick through the list, and print it for the fridge.

Abdominal ultrasound in one line: Usually fasting for about 6 hours so the gallbladder is full and gas is low.

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Do not eat for about 6 hours before, or as your letter says; a full gallbladder shows clearly, an emptied one hides stones.Key step
Small sips of plain water are usually fine; skip fizzy drinks entirely (gas is the enemy of the picture).
Take regular medicines as normal with a sip of water unless told otherwise; never stop them on your own.
Wear a two-piece outfit so only your tummy needs uncovering.
Bring your referral letter and any previous scan reports or images; comparisons make reports better.Key step
Tell the sonographer about allergies, pacemakers or pregnancy where relevant, and ask questions freely.
Your clinic's own instructions override everything on this page.Key step

Ticks live only on this page while it is open; print the sheet to take it with you.

Reviewed against NHS ultrasound guidance and RCR patient information.

Sources

Ultrasound scan NHS, 2023
Patient information: radiology examinations The Royal College of Radiologists (RCR), 2023
General ultrasound RadiologyInfo.org (ACR / RSNA), 2024

Last reviewed: 2026-07-16

Curious what your scan can actually show? Explore what ultrasound can see, then decode the report afterwards.

Sources

Why the prep rules exist