An MRI is one of the most useful diagnostic tests in medicine. It produces highly detailed images of soft tissues, organs, joints, and the brain — without using any radiation. But for many people it is also one of the most anxiety-inducing appointments, partly because of the enclosed space and partly because they simply do not know how long they will be lying inside the machine.
Knowing what to expect — including how long the scan will take for your specific body part — makes the whole experience significantly less daunting. This guide covers everything you need to know so you can walk into your appointment feeling prepared and calm.
How Long Does an MRI Scan Take?
An MRI scan usually takes between 15 minutes and one hour, but can take longer. This is the range confirmed by the NHS, and it reflects a genuine variation based primarily on which part of the body is being examined.
Guy’s and St Thomas’ NHS Foundation Trust states that the average scan takes between 20 and 30 minutes per body part, though some may take longer. Harrogate and District NHS Foundation Trust confirms that most scans take around 30 minutes, while some take up to 90 minutes.
It is important to understand that the scan time and the total appointment time are different things. Cambridge University Hospitals’ MRI patient information notes that the examination can be anywhere from 10 to 60 minutes, but your total time at the clinic will be longer. You will need to factor in:
Arriving and checking in at reception. Completing a safety questionnaire with the radiographer. Getting changed and removing all metal items. Being positioned on the scanner bed and having the coil placed. The scan itself. A brief wind-down and, if contrast dye was used, a 30-minute post-scan wait.
In practice, most patients should allow between one and two hours for the full visit, even if the scan itself takes 30 minutes.
How Long Does an MRI Take by Body Part?
The single biggest factor determining how long your MRI will take is the part of your body being scanned. Larger, more complex areas require more image sequences and more time inside the machine. Here is a practical breakdown.
Brain and head: 30 to 60 minutes. A standard brain MRI typically takes 30 to 45 minutes. More detailed neurological evaluations requiring multiple sequences may take up to 60 minutes or longer. A limited brain MRI capturing just a quick sequence may take less than 15 minutes.
Cervical spine (neck): 20 to 45 minutes. A cervical spine MRI can be completed in as little as 20 minutes in straightforward cases. Most take 30 to 45 minutes.
Lumbar spine (lower back): 30 to 60 minutes. This is one of the most commonly requested MRI scans in the UK, often arranged to investigate back pain, sciatica, or disc problems. If contrast dye is required, the time extends to 45 to 80 minutes.
Full spine: 60 to 90 minutes. When all three sections of the spine — cervical, thoracic, and lumbar — are scanned together, the total time can be 60 to 90 minutes or longer.
Knee: 20 to 45 minutes. Joint MRIs such as the knee are among the quicker scans, as the area is relatively small and well defined. A coil is usually placed around the knee to improve image quality.
Shoulder: 15 to 45 minutes. Shoulder MRIs can be as quick as 15 minutes for a focused scan, though more comprehensive imaging may take up to 45 minutes.
Hip: 30 to 60 minutes. Most hip MRIs take around 45 minutes, depending on the complexity of the imaging required.
Ankle and foot: 30 to 45 minutes. The NHS confirms that an ankle MRI typically takes around 40 minutes, though it can take longer in some cases.
Abdomen: 30 to 90 minutes. The abdomen is one of the more time-consuming areas to scan due to its size and the complexity of the organs involved. Some abdominal MRIs can take up to two hours.
Pelvis: 30 to 60 minutes. A pelvic MRI typically takes 30 to 60 minutes, and may take longer if many images are needed.
Cardiac (heart): up to 90 minutes. Cardiac MRI is among the longest and most complex. The scan requires synchronisation with your heartbeat using ECG leads, and may take 45 to 90 minutes or more. If you are investigating heart symptoms, our ECG heart health check-up is a useful first step before moving to MRI.
What Happens During an MRI Scan?
Understanding what actually happens inside the scanner removes much of the anxiety around the test. An MRI is painless and safe — it uses magnetic fields and radio waves, not radiation. Here is what to expect from start to finish.
On arrival. You will be greeted by a radiographer and asked to confirm your details. You will complete or review a safety questionnaire covering any metal implants, previous surgeries, pacemakers, or allergies. This is taken very seriously — the MRI machine uses an extremely strong magnet.
Getting ready. You will be asked to remove all metal items — jewellery, watches, hearing aids, hair clips, and sometimes clothing with metal fastenings. A hospital gown may be provided. Lockers are available for your belongings.
Positioning. You will lie on a motorised bed. A piece of equipment called a coil — which acts as a receiver for the scanner’s signals — is placed over or around the part of your body being scanned. You will then be moved into the scanner.
Inside the scanner. Leeds Teaching Hospitals confirms that the scan takes between 20 minutes and one hour, and you must stay very still throughout. Movement blurs the images and may mean a sequence has to be repeated, extending the total time.
The machine is loud. NHS Inform describes the noise as comparable to standing immediately next to roadworks — loud tapping, banging, and clicking caused by the electric current in the scanner coils switching on and off. Ear protection is always provided, and in many clinics you can listen to music through headphones during the scan.
You will be given a call button or buzzer to press at any time if you feel uncomfortable or need to stop. A radiographer will be watching you throughout from the control room, and you can speak to each other via intercom between sequences.
For scans of the abdomen or chest, you may be asked to hold your breath for short periods while images are taken. The radiographer will give you clear instructions beforehand.
After the scan. Once the images are complete, the bed will move out of the scanner. Cambridge University Hospitals confirms that an MRI scan is usually carried out as an outpatient procedure — you do not need to stay in hospital. You can return to normal activities straight away, unless sedation or contrast dye was used.
Does Contrast Dye Make an MRI Take Longer?
Yes — and by a meaningful amount. If your scan requires contrast dye, it will typically add 15 to 30 minutes to the scanning time, plus an additional wait afterwards.
The NHS explains that at some scan appointments, patients are given an injection of a contrast medium to help show more detail in the MRI images. This dye — usually a substance called gadolinium — makes certain tissues, blood vessels, and areas of inflammation appear more clearly on the scan.
The contrast is injected through a small plastic tube (cannula) placed in a vein in your arm before or during the scan. The radiographer will take a set of images before the injection, administer the dye, and then take a second set of images to show how the tissue responds. Each set of images adds to the total scanning time.
The NHS also confirms that after a scan involving contrast, you will be asked to wait at the clinic for around 30 minutes to ensure you do not have a reaction. Reactions are rare and usually mild — they may include nausea, a skin rash, headache, or dizziness. If you experience any visual disturbance after leaving, do not drive and contact your GP or go to A&E.
Not every MRI requires contrast dye. Your clinician or radiologist will decide in advance whether it is needed based on the reason for your scan.
What Can Make an MRI Take Longer Than Expected?
Even when you have been given a specific appointment slot, several factors can extend your time in the scanner or your overall wait at the clinic.
Movement during the scan. This is the most common reason for a scan taking longer than planned. Cambridge University Hospitals’ patient guidance explains that if you move, sequences may need to be repeated to obtain clear images. Even small, involuntary movements — breathing, swallowing, or flinching — can affect image quality in sensitive areas such as the brain or spine.
The number of sequences ordered. An MRI is not a single image. It is a series of sequences, each capturing the area from a different angle or with different settings, with each sequence lasting a few minutes. If your clinician has requested more detailed imaging, more sequences are needed, and the scan takes longer.
Contrast dye. As described above, this adds 15 to 30 minutes to the scan itself, plus the post-scan wait.
Claustrophobia or anxiety. NHS Inform advises that if you are claustrophobic, you can ask for a mild sedative to help you relax — but this must be requested from your GP well before the appointment, as the scanning department cannot prescribe sedation on the day. If sedation is used, you will need someone to drive you home. Modern scanners tend to be shorter and wider than older models, which reduces the severity of claustrophobia for most people.
Emergency cases. NHS MRI departments also serve emergency and inpatient cases. Leeds Teaching Hospitals notes that emergency patients are sometimes accommodated, which can delay the scheduled list. It recommends allowing at least two hours for your appointment.
Scanner technology. Newer MRI machines can complete sequences more quickly than older models, reducing overall scan time. The technology and software used varies between clinics and hospitals.
How Long Is the Wait for an MRI in the UK?
The scan itself may take 30 to 60 minutes — but getting the appointment in the first place is where most people experience the real delay.
Practice Plus Group’s analysis of NHS MRI waiting times confirms that according to the NHS Constitution, patients should receive their MRI scan within six weeks of referral. In practice, the average estimated wait has ranged between six and 18 weeks depending on location. At the start of 2024, around 26% of patients were waiting longer than six weeks. This figure improved significantly to around 6% by early 2025, in part due to the establishment of Community Diagnostic Centres across England.
Even so, for patients with pain, unexplained symptoms, or an urgent clinical question, a wait of six weeks or more can feel intolerable. A private MRI scan typically becomes available within days of booking. Practice Plus Group reports that private patients can be seen within around one week, with results available to their referrer within three working days.
At The Private GP, we can help you navigate your options. Our full health check-up gives a comprehensive clinical assessment that may clarify whether an MRI is the most appropriate next step for your symptoms, or whether another investigation would give faster and equally useful information. If an MRI is needed, we can arrange a referral promptly.
For patients who cannot easily travel to a clinic, our home visit service brings the consultation to you. Explore our full range of services to find the right starting point for your care.
Frequently Asked Questions
- Can I eat and drink before an MRI scan?
In most cases, yes. The NHS confirms that you can eat and drink normally before a standard MRI scan. The exception is abdominal or pelvic MRI, where you may be asked to fast for four to six hours beforehand to reduce movement from digestion. Your appointment letter will tell you if this applies to you. When in doubt, contact the scanning department to check.
- What should I wear to an MRI appointment?
Wear loose, comfortable clothing without metal fastenings — no zips, underwire bras, or belts with metal buckles if you can avoid them. You will be asked to remove all jewellery, watches, and accessories. NHS Inform advises leaving valuables at home and arriving as metal-free as possible. You may be asked to change into a hospital gown if your clothing has metal parts.
- Can I have an MRI if I am claustrophobic?
Yes, in most cases. NHS Inform confirms that if you are claustrophobic, you can ask for a mild sedative to help you relax — but this must be prescribed by your GP before the appointment, as the MRI department cannot prescribe it on the day. Modern scanners are shorter and wider than older models, which helps many patients manage. If you are very anxious, contact the scanning department in advance to discuss your concerns and, in some cases, arrange a visit to see the machine beforehand.
- Is an MRI scan painful?
No. An MRI scan is completely painless. The NHS confirms that anaesthesia is not usually needed. You may feel slight warmth in the area being scanned during longer sequences, and occasionally some patients notice tingling in their fingertips — both of which are normal and harmless. The main discomfort for most people is the noise and the need to lie very still for an extended period.
- How long does it take to get MRI results?
This depends on whether your scan is NHS or private. On the NHS, results are typically sent to the referring clinician within a few weeks, though urgent results are provided within seven days. Practice Plus Group confirms that private MRI results are generally available to your referrer within three working days. Your GP or consultant will then arrange an appointment to discuss the findings with you.