A paediatric MRI is one of those things a parent never expects to be planning until, suddenly, they are. The referral arrives, the appointment letter follows, and there are questions no one has really answered. Will my child need to be asleep. Can I stay with them. Will the noise frighten them. How long will we be there. This guide is written for that exact moment, from the perspective of a family walking into it for the first time.
MRI in children is not just an adult scan on a smaller body. The protocols are shorter, the coils are child-sized, the environment is designed to look less clinical, and for the youngest children the whole thing is done under sedation or a general anaesthetic because a five-year-old cannot lie perfectly still for 30 minutes inside a loud tunnel. None of this is a problem when the team you are with does it every day.
The one-line answer
Most UK children under six will have an MRI under general anaesthetic or deep sedation, most children over ten will manage the scan awake with good preparation, and the six to ten age group is decided child by child. A private paediatric MRI without anaesthetic in 2026 costs roughly £500 to £900. With GA, add around £600 to £1,000 for the anaesthetist and recovery. Waits are typically one to three weeks privately, versus eight to sixteen weeks on the NHS.
When children need sedation or GA
The single hardest thing about MRI in children is that the scan only works if the patient is completely still. Even small movements blur the images enough that the radiologist cannot report them, and the sequences have to be repeated. For a five-year-old, staying perfectly still for a 25-minute brain MRI is not realistic, however brave they are being.
The rule of thumb UK paediatric radiology departments use in 2026 is broadly:
- Under six. General anaesthetic or deep sedation, delivered by a paediatric anaesthetist, is the default. It is not a sign of a nervous child, it is the standard of care.
- Six to ten. Decided case by case. It depends on the child’s temperament, the length of the sequences, whether contrast is needed, and how they respond to a mock scanner visit. A confident eight-year-old having a short knee MRI may sail through awake. A wary seven-year-old having a full spine study may need sedation.
- Over ten. The great majority manage awake with good preparation. Older children and teenagers are usually treated much like adults, with the same claustrophobia options available if needed.
Neonatal MRIs are a specialist category of their own and are usually done in feed-and-wrap mode in dedicated units, without anaesthetic. Parents referred into that pathway are almost always guided by a neonatal team who will explain it in detail.
Age-appropriate preparation
Preparation is the single biggest predictor of whether a school-age child completes their scan awake. It is not about being brave. It is about knowing exactly what is coming.
What tends to work, in the days before the scan:
- Picture books and videos designed for children. Most large UK paediatric radiology departments have short films showing the scanner, the noises, and other children going through it. Watching one at home a few nights running normalises the whole thing.
- Mock scanner visits. Some children’s hospitals and a growing number of private paediatric imaging units offer a mock MRI experience, where the child can lie in a life-size dummy scanner with the sounds playing, without any pressure to be scanned that day. For anxious children this can be the difference between a completed awake scan and a cancelled one.
- Play specialist input. NHS paediatric departments and larger private paediatric units employ health play specialists. They meet the child before the scan, explain it in language the child understands, and often stay with them through it. Their impact on cooperation is underestimated.
- Practice at home. Ten minutes of lying still while listening to loud music through headphones, once or twice, is a surprisingly good rehearsal.
- Weighted blankets and comfort items. A weighted blanket in the scanner, or a familiar teddy tucked under the arm, calms many children who would otherwise fidget.
The paediatric MRI environment
Well-run paediatric MRI units look and feel different from adult ones. The waiting room usually has toys and books. The scanner room may have decorated ceiling panels, a projected image of the sky or a favourite film, and soft lighting. The coils, which are the antennae placed around the body part being scanned, come in child-sized versions that are lighter and less intimidating than the adult ones.
Two things matter more than the decor. First, in almost all UK paediatric MRI units, one parent can stay in the scan room throughout, provided they pass the same MRI safety questionnaire the patient does. The parent is usually seated at the end of the scanner where the child can see them, or with a hand on their leg. Second, the child is offered headphones that play their choice of music or a cartoon shown on a mirror above their eyes. A film they know by heart, playing while the scan runs, is a genuinely powerful anxiety tool.
Common paediatric MRI indications
Children are referred for MRI for a much narrower range of reasons than adults, and the pattern is worth knowing so the referral feels less alarming.
- Neurological. Developmental delay, first unprovoked seizure, headaches with red flag features (early morning vomiting, focal weakness, personality change), suspected demyelination, and follow-up of known conditions such as hydrocephalus. Most of these MRIs are of the brain, sometimes the whole neuraxis.
- Musculoskeletal. Sports injuries in older children and teenagers, limp of unknown cause in younger children (where hip, pelvis and sometimes whole-body MRI is used to look for infection or inflammation), and follow-up of juvenile arthritis. See our overview of what an MRI shows.
- Oncology. Surveillance in children with known predisposition syndromes, staging and monitoring of solid tumours, and post-treatment follow-up.
- Congenital heart disease. Cardiac MRI is used from infancy onwards to characterise structural abnormalities and monitor after surgery.
- Abdominal and pelvic. Inflammatory bowel disease follow-up, congenital renal or urological anomalies, and evaluation of complex abdominal pain when ultrasound has been inconclusive.
The vast majority of paediatric MRIs are done for reassurance and monitoring, not because something serious has been found. Radiologists are cautious and thorough when the patient is a child, and the aim is very often to rule out rather than to confirm.
