How to prepare for a CT or MRI scan

If you’ve ever booked yourself in for a CT scan or MRI and suddenly thought, “Wait, what can I eat or drink beforehand? Should I remove jewellery? And what’s the story with tattoos and implants?” You’re certainly not alone.

I once nearly delayed my own scan by turning up in my favourite metal-studded jeans—lesson learned. So, let’s clear up all that confusion now, so your experience goes smoothly.

Here’s everything you need to know to properly prepare for your next CT or MRI.

Can you eat or drink before a CT or MRI scan?

When it comes to eating and drinking before scans, the instructions depend on the type of scan you’re having:

CT scan preparation (especially with contrast dye)

If you’re having a CT scan with contrast dye, you may be asked to fast for around 4 hours beforehand. Why? To reduce the risk of nausea and vomiting which can be a side effect of the contrast.

A sip of water or necessary medication is generally fine but skip that hearty breakfast sandwich. For a standard CT head or non-contrast scan, there are usually fewer restrictions, so always double-check your instructions from your local CT provider.

MRI scan preparation tips

Usually, there aren’t strict dietary rules with MRIs unless contrast dye is involved. You can usually eat or drink as normal, but limiting caffeine might be wise, as it can make staying still harder. Twitching during a scan isn’t exactly ideal!

Still unsure? Always check with your Xplore clinic to confirm the guidelines.

Can you wear metal during a scan?

Here’s the short answer: No metal allowed—at least, not during MRI scans.

MRI machines use powerful magnets. Anything metallic (jewellery, watches, even those studs on your jeans) can cause distortion of images or, worse, become dangerous projectiles. It’s not exactly a scene from a superhero film you want to recreate in real life.

CT scans don’t use magnets, so metal isn’t as critical, but it’s best to remove jewellery or clothing with metal anyway, as it can obstruct a clear image.

Here’s a quick checklist for MRI scans:

• Remove all metal jewellery and piercings.
• Leave watches, phones, and metal accessories at home.
• Wear comfortable clothing without metal zips, studs, or buttons.

What if you have tattoos or implants?

If you’ve got some ink you’re proud of, don’t stress! Tattoos are usually fine. Some tattoos contain metallic inks that can cause mild warmth or tingling in MRI machines, but it’s very rare. If you notice any discomfort during the scan, tell your technician straight away.

Metallic implants, pacemakers, or cochlear implants, however, can interact dangerously with MRI magnets. Always inform your radiographer about any implants beforehand. They’ll make sure you’re safe.

Preparing for the best imaging results

To make sure your scans are as accurate as possible, here’s a quick, easy-to-follow checklist:

• Follow fasting instructions carefully for CT scans with contrast dye.
• Remove all metal objects, including jewellery and piercings.
• Inform your clinic about any tattoos, implants, or medical devices.
• Avoid caffeine before MRI scans (if you tend to get jittery).
• Wear comfy clothes without metal to save time and avoid any awkward wardrobe changes.

Following these simple tips means you’ll be set up for crystal-clear results.

Common FAQs about CT and MRI prep

Take the worry out of your next scan

Radiology appointments don’t need to feel overwhelming. With a little preparation, like double-checking for sneaky metal zippers and remembering not to eat right before a contrast CT scan, you’ll be confident, relaxed, and ready to go.

Got more questions about your scan? Visit our helpful CT and MRI scan pages or speak directly with our friendly radiology team.

Ready to book your scan? Xplore Radiology offers trusted, friendly care with crystal-clear imaging results—because peace of mind starts here.

Book your CT or MRI scan today or contact our team to learn more.

Good luck with your scan! And if you’ve got any quirky scan-day stories of your own, comment below. We’d love to hear them.