Abdominal X-Ray in Ajax: What It Can and Cannot Show

“If they X-ray my stomach, they’ll see whatever is wrong.” It is an understandable assumption. X-rays have a reputation for seeing straight through people, and the abdomen is where so many uncomfortable symptoms seem to live. The reality is more selective. An abdominal X-ray is very good at answering a handful of specific questions, and it is not designed to answer many others.

That is not a weakness of the test so much as a matter of fit. Your health-care provider chooses an abdominal X-ray when the question they have is one this test answers well. When it is not, they reach for something else, often an ultrasound. This article explains where that line sits, so that patients in Ajax and nearby communities have a clearer sense of why the test was ordered and what the report can realistically tell their provider.

Why the abdomen is tricky to X-ray

An X-ray image is essentially a shadow picture. Dense materials such as bone and metal block much of the beam and appear white. Air lets the beam pass easily and appears black. Most soft tissue, including muscle, fat and the organs, sits somewhere in between as shades of grey.

The chest is a good subject for X-ray because the lungs are full of air, which creates natural contrast against the heart and ribs. The abdomen is different. It is packed with organs that have similar densities: the liver, spleen, kidneys, pancreas, intestines, bladder and, in some people, the uterus and ovaries. On a plain X-ray, many of these blend into one another. What stands out are the things with very different densities: gas in the bowel, the bones of the spine and pelvis, and anything that is especially dense, such as some types of stones or a swallowed metal object.

That single idea explains almost everything about what an abdominal X-ray can and cannot do.

What an abdominal X-ray does well

Because gas, bone and dense objects show up clearly, a plain abdominal X-ray can help a provider with questions such as these:

The pattern of gas in the bowel

Gas normally moves through the intestines in a recognizable pattern. When that pattern changes, for example when loops of bowel look unusually stretched with gas, it can suggest that things are not moving through as they should. Providers may use an abdominal X-ray as one piece of information when thinking about a slowed or blocked bowel.

Stool burden and constipation

In some situations, particularly in older adults or people with ongoing bowel symptoms, a provider may use an X-ray to get a general sense of how much stool is in the colon. It is not a test everyone with constipation needs, and many providers diagnose constipation without imaging at all. When it is ordered, it is usually to help guide a decision rather than to confirm the obvious.

Swallowed objects

Coins, batteries, small toys, pins and other dense objects tend to show up well on X-ray. When someone has swallowed something they should not have, an X-ray can help show where the object is. Some swallowed objects, especially button batteries and magnets, need urgent care, and those situations belong in the emergency department, not at a community clinic.

Some stones and calcifications

Certain kidney stones contain enough calcium to be visible on a plain X-ray. An X-ray that covers the kidneys, ureters and bladder, often abbreviated KUB, is sometimes used to look for or follow up on stones that are known to show up this way. Not all stones are visible, though, so a clear X-ray does not necessarily rule one out.

Checking tubes, devices and surgical material

For people who have medical devices, drains, feeding tubes or surgical clips, an X-ray can show where these items sit, since most of them are visible on the image.

The bones of the lower spine and pelvis

An abdominal image includes part of the lumbar spine, the pelvis and the hip joints. Although dedicated spine or pelvis X-rays are the usual choice when bones are the main concern, the bones are visible in the background of an abdominal image too.

What an abdominal X-ray usually cannot show

This is where expectations most often need adjusting. On a plain abdominal X-ray, it is generally difficult or impossible to assess:

• The gallbladder and gallstones. Most gallstones do not contain enough calcium to show up on X-ray.
• The liver and pancreas in any detail. Their outlines may be faintly visible, but changes within them generally are not.
• The appendix. Appendicitis is not usually diagnosed with a plain X-ray.
• The ovaries, uterus and prostate. These soft-tissue organs are assessed with other methods.
• The lining of the stomach or bowel. Ulcers and inflammation of the lining are generally not visible on plain X-ray. Other tests, such as scopes, are used for that.
• Hernias, in most cases. A provider usually assesses these by examination, and with ultrasound when imaging is needed.

So if your symptom is upper-right abdominal pain after fatty meals, for example, an abdominal X-ray is unlikely to be the first test you are sent for. The tool that fits that question is usually ultrasound.

How ultrasound fills the gaps

Ultrasound uses sound waves instead of X-rays and is excellent at showing the solid organs and fluid-filled structures that X-ray struggles with. It is commonly used to look at the gallbladder, liver, kidneys, spleen, pancreas, bladder and pelvic organs. It does not use ionizing radiation. Its main weakness is gas: sound waves do not travel well through air, so gas-filled bowel can block the view. That is the reverse of X-ray, where gas actually helps.

This is why the two tests are often described as complementary. We have written separately about kidney and gallbladder ultrasound, and about how to prepare for an abdominal ultrasound, which usually involves fasting. Your provider may order one test, the other or both, depending on the question.

For some problems neither plain X-ray nor ultrasound gives enough detail, and a provider may arrange a CT scan or other imaging at a hospital or another facility.

Severe abdominal pain is an emergency question

It is worth saying plainly. If you have sudden, severe abdominal pain, pain with a rigid or very tender belly, vomiting that will not stop, vomiting blood, black or bloody stools, a high fever with abdominal pain, or pain during pregnancy, call 911 or go to the nearest emergency department. The same applies if a child has swallowed a battery or magnet. A community imaging clinic is set up for planned, non-urgent imaging after a provider has assessed you, and emergencies need the full resources of a hospital, whether you live in Ajax, Pickering or Whitby.

What the exam looks like

An abdominal X-ray is a quick exam. Here is what typically happens at our Ajax clinic:

1. Changing. You will likely be asked to change into a gown and remove belts, jewellery, and clothing with zips, snaps or buttons around the abdomen and hips. Metal can hide what the image is meant to show.
2. Positioning. Most commonly, you lie on your back on the X-ray table. Depending on what your provider has requested, an image may also be taken while you stand, or while you lie on your side. Standing and side views can show how air and fluid settle, which is sometimes part of the question.
3. Breathing instructions. You will be asked to breathe out and hold still for a moment. Breathing moves the abdomen, and stillness keeps the image sharp.
4. Done. The exposures take only seconds. Most of the visit is spent changing and positioning.

Preparation

A routine abdominal X-ray generally does not require fasting. Your provider may give you specific instructions depending on why the test was ordered, and those instructions take priority. If you are having an abdominal ultrasound on the same day, the ultrasound preparation, such as fasting, still applies, so ask the clinic how to sequence the two when you call.

Pregnancy

An abdominal X-ray aims the beam directly at the area where a pregnancy would be. If there is any chance you could be pregnant, tell your provider and the technologist before the image is taken. Your provider may consider a different test or decide the X-ray is still necessary. Our article on X-ray radiation safety explains how imaging teams think about dose and pregnancy in more detail.

Reading the report: what “unremarkable” means

The report for an abdominal X-ray goes to your ordering provider. You may hear phrases such as “non-specific bowel gas pattern” or “unremarkable.” These usually mean the radiologist did not see the particular features that would point to a problem on this type of image.

That is useful, but it is worth remembering what it covers. Since an abdominal X-ray cannot see many organs well, an unremarkable result is an answer to the specific question the test can address. If your symptoms continue or change, go back to your provider. They may suggest a different test, and that is a normal next step rather than a sign the first test was a mistake.

Key takeaways

• An abdominal X-ray shows gas, bone and dense objects clearly, but most soft organs blend together.
• It can help with questions about bowel gas patterns, stool burden, swallowed objects, some stones and the position of medical devices.
• It generally cannot show gallstones, the appendix, the ovaries, the liver’s internal detail or the lining of the bowel.
• Ultrasound is often used for the organs that X-ray struggles with, and the two tests complement each other.
• Severe or sudden abdominal pain is a reason to go to the emergency department, not to a walk-in imaging clinic.

Abdominal X-rays at Rossland Diagnostic Clinic are part of our walk-in digital X-ray service at 300 Rossland Road East in Ajax, open Monday to Friday from 9:00am to 5:00pm and Saturday from 8:00am to 3:30pm. The department may close once daily capacity is reached, so please call 905-426-3111 to check availability before you come. If your provider has also asked for an ultrasound, you can request an appointment online and our team will confirm the preparation with you.