What an X-ray actually is

An X-ray is a quick medical picture taken with a small, carefully controlled beam of invisible light-like energy. The beam passes through your body and onto a detector — a bit like a camera on the other side of you. Dense things like bone block more of the beam, so they show up bright white. Air (like the air in your lungs) lets the beam through easily, so it shows up dark. Everything else is a shade of grey in between.

Nothing touches you, nothing is injected for a standard X-ray, and you won’t feel anything at all while the picture is taken.

How long does it take?

Usually just minutes. Each picture takes a fraction of a second — most of your visit is walking in, getting positioned, and walking out. A simple X-ray (say, a wrist or a chest) is often done within 5–10 minutes of entering the room. You can usually go straight back to your day afterwards.

Before your visit

Do I need to prepare?

Usually not. For almost all X-rays you can eat, drink, take your normal medicines, and drive yourself there and back. No fasting, no special drinks. (A small number of special X-ray tests — like a barium swallow — do need preparation, and you’ll be told clearly in advance if yours does.)

What to wear — and what to take off

• Wear comfortable clothing without metal over the body part being imaged — zips, underwire, studs, sequins and metal buttons can appear on the picture and hide what the doctor needs to see.
• You may be asked to remove jewellery, watches, hair clips, glasses or piercings near the area being X-rayed. Leave valuables at home if you can.
• Sometimes you’ll be asked to change into a gown. There’s a private space for this, and you can ask for a chaperone at any point.

What to bring

• Your referral or request form (paper or electronic) if your doctor gave you one
• Any appointment letter and your usual ID
• If you’ve had similar X-rays elsewhere, it can help to mention where — old pictures are useful for comparison

If you might be pregnant

Before some X-rays, staff will ask anyone who could be pregnant about the possibility — often including the date of your last period. Please don’t be embarrassed or alarmed by the question. It’s a routine safety check we ask everyone, and it lets the team choose the best approach for you. Many X-rays (like a hand, chest or ankle) are nowhere near the womb and are very low dose anyway, so often the answer simply confirms it’s fine to go ahead. If there’s any doubt, the team can adjust, delay a non-urgent test, or choose a different test. There’s more on this in the Is it safe? section.

Preparing a child for an X-ray

• Keep it simple and honest: “They’re going to take a special photo of the inside of your arm. It doesn’t hurt at all — you just have to keep really still, like a statue.”
• Practise the “statue game” at home — holding still for a few seconds, maybe holding a big breath for a chest X-ray.
• Bring a comforter — a favourite toy or blanket is welcome (as long as it’s not on top of the body part being imaged).
• A parent or carer can usually stay in the room the whole time. Paediatric radiographers are very used to wriggly patients and will make it quick and friendly.

During the exam — step by step

1. You’re greeted and checked in. The radiographer confirms your name and date of birth, explains what they’re going to do, and answers any questions. This is a great time to mention pain, mobility problems, or possible pregnancy.

2. You’re positioned. You might stand against a board, sit, or lie on a padded table. The radiographer gently arranges the body part so the picture shows exactly what your doctor asked about. Tell them if a position hurts — there’s almost always a work-around.

3. The radiographer steps behind a screen. This can look odd — “if it’s safe, why are they leaving?” The answer is simple: you get one X-ray today; they would otherwise get a tiny bit of exposure from every patient, all day, every day, for years. Standing behind the screen keeps their lifetime exposure low. They can still see and hear you the whole time.

4. “Hold still — and hold your breath.” The picture takes a fraction of a second, but any movement blurs it, just like a shaky photo. For chest and tummy X-rays, breathing moves everything inside, so a held breath gives a sharp picture. It’s over in a couple of seconds.

5. Sometimes more than one picture. Most body parts are photographed from two or more angles — a single flat picture can hide things, and two views together show the full 3-D story. Extra views are normal and planned, not a sign anything is wrong.

6. Quick check, then you’re done. The radiographer checks the pictures are sharp and complete, then you’re free to go. Occasionally one is repeated because of movement or positioning — that’s about picture quality, not your health.

Holding a child during an X-ray

Small children sometimes need a steady, reassuring pair of hands to keep still. If your child needs holding, a parent or carer is usually asked to help rather than staff — a familiar face keeps a child calm, and it keeps staff exposure down. You’ll be given a lead apron, shown exactly where to stand and how to hold, and kept out of the X-ray beam itself. If you might be pregnant, tell the team and someone else will hold instead.

Is it safe? Radiation, in plain terms

X-rays use a small amount of ionising radiation — the same kind of energy that reaches all of us every day from the ground, building materials, food, and space. This everyday exposure is called natural background radiation, and the average person receives about 2–3 millisieverts (mSv) of it every year just by living on Earth.

Comparing an X-ray to background radiation is the honest way to picture the dose:

Figures are typical adult values from RadiologyInfo.org and the US Nuclear Regulatory Commission; your exact dose varies with body size and equipment.

“We only image when it helps”

Every X-ray in a modern hospital or clinic follows the justification principle: it’s only done when the information it gives is expected to help you more than the tiny dose could ever harm you. Your referring doctor and the imaging team both act as checks — if a test isn’t needed, or a radiation-free test (like ultrasound) would answer the question, that’s what should happen instead. Doses are also kept as low as reasonably achievable for every picture (“ALARA”).

Honest risk framing

At the doses used in plain X-rays, any added lifetime cancer risk is too small to measure directly — it’s estimated from much higher exposures, and for a chest X-ray it is a tiny fraction of the roughly 1-in-2 background chance we all carry. We don’t pretend the risk is exactly zero; we can say confidently that for a needed X-ray, the benefit of an accurate diagnosis outweighs it by a wide margin. The riskiest thing about a justified X-ray is usually the drive to the clinic.

Pregnancy

Children

Children are a little more sensitive to radiation than adults and have more years ahead of them, so imaging teams take extra care. Most departments follow the international Image Gently campaign: child-sized doses, only the views that are needed, and ultrasound or MRI first when they’d answer the question. A justified X-ray in a child is a very safe test — and finding the fracture or the chest infection matters far more than the few hours-to-days of background-equivalent dose it costs.

After your X-ray

Who looks at the pictures?

Your images are examined by a radiologist — a doctor who specialises in reading medical images — or, in some countries (such as the UK), by a specially qualified reporting radiographer. They study every part of the picture, compare it with any older images, and write a report for the doctor who sent you.

Why can’t the radiographer tell me the result?

This is the question patients ask most, and the answer isn’t secrecy. The radiographer who takes your pictures is an expert in making images, but the formal interpretation is the reporting doctor’s job — and results are best given by your own doctor, who knows your history, can explain what a finding means for you, and can arrange the next step in the same conversation. A corridor comment about half-reviewed images helps no one — so please don’t read anything into a radiographer’s friendly poker face. It’s the same for everybody.

When and how do results arrive?

• The written report typically reaches your referring doctor within a few hours to a few days, depending on urgency and the service.
• Urgent findings are flagged fast — if something needs immediate attention, the imaging team contacts your doctor (or the emergency department) straight away rather than waiting for the routine report.
• You’ll usually get your result at a follow-up appointment, phone call, or through a patient portal. If you haven’t heard within the time your doctor suggested, it’s always OK to ring and ask — no news should never be assumed to be good news.

Can I see my own images and report?

Yes. They’re part of your health record. Many services now offer a patient portal where you can view the report (and sometimes the images) yourself; otherwise you can request copies — often on disc or via a secure link — from the imaging department. This is also handy if you move cities or want a second opinion.

Any after-effects?

None. A plain X-ray leaves nothing behind in your body — no radiation stays with you, and there’s nothing to “flush out”. You can hold your baby, hug your family, and carry on with your day immediately.

Common questions