IBD Diagnosis And Tests

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There is no single test that can confirm inflammatory bowel disease (IBD). Doctors usually use a combination of symptoms, medical history, blood and stool tests, imaging, and endoscopy to understand what is causing the symptoms. 

Medical History And Examination

The diagnosis of IBD usually starts with a detailed conversation about your symptoms and health history. The doctor may ask about bowel habits, abdominal pain, blood or mucus in stool, weight changes, tiredness, fever, symptoms that occur at night, and how long these problems have been present. They may ask about family medical history and previous medicines you take. Doctors may check the abdomen for tenderness and swelling during a physical examination. Including medical history, doctors may suggest some other tests such as blood tests, stool tests, and imaging to better identify the disease pattern.

Blood Tests

Blood tests help detect anemia, inflammation, nutritional deficiency, and infection in the digestive tract. Blood tests usually measure the number of red blood cells. This process usually takes up to two days. Doctors take your blood sample and send it to the laboratory, and the results reveal several telltale signs of IBD. Common tests may include CBC, CRP, ESR, CMP, iron, and vitamin B12 levels. Blood tests cannot confirm IBD on their own, but they provide useful information about overall health. 

CRP And ESR

CRP (C-reactive protein) and ESR (Erythrocyte Sedimentation Rate) are blood tests that can show whether there is inflammation in the body. CRP often changes more quickly when inflammation increases, while ESR can take longer to change. These tests can give doctors an idea of how active the inflammation may be, but they cannot confirm IBD or identify its type by themselves.

CMP And Nutritional Panels

CMP, or Comprehensive Metabolic Panel, assesses kidney function, liver enzymes, and electrolyte balances that usually drop due to diarrhoea or medication side effects. To find nutrient absorption issues, nutritional panels measure levels of iron, ferritin, folate, vitamin B12, and vitamin D.

Full Blood Count

A full blood count checks different types of blood cells. In IBD, it can help doctors look for anemia, infection, or changes in the white blood cells and platelets. It can show problems that may occur along with ongoing inflammation or blood loss. 

Stool Tests

Doctors may suggest a stool test because IBD affects the frequency and consistency of bowel movements. Stool tests help measure the severity of inflammation, infection-causing bacteria, parasites, and blood present in the stool that may not be visible to the naked eye. It usually takes five to seven days.

Stool Culture

A stool culture is a lab test that checks a stool sample for harmful bacteria and fungi that can cause gut infections in the digestive tract. Doctors may suggest it when someone has diarrhoea, blood or mucus in stool, or severe abdominal cramps.

Colonoscopy And Biopsy

Doctors always recommend colonoscopy to diagnose Crohn’s disease and ulcerative colitis. A colonoscopy lets a doctor check the lining of the colon and rectum to check for inflammation, ulcers, and other signs of IBD. During the procedure, the doctors also collect small tissue samples from the colon, known as a biopsy. They examine these samples under a microscope to look for changes linked with IBD and help confirm the diagnosis. Doctors may suggest you not eat solid food for 24 hours before the procedure and may give you a sedative to make you sleepy to avoid any discomfort. You may feel a little drowsy after the procedure. 

Biopsy Results

A biopsy checks bowel tissue for signs of inflammation and other changes linked to IBD. The results are considered along with your symptoms and other test findings. 

Imaging And Small-Bowel Tests

Imaging tests help doctors examine parts of the digestive tract that cannot be seen with a colonoscopy. MRI enterography, CT scan enterography, intestinal ultrasound, and capsule endoscopy may be used to check the small bowel for inflammation, narrowing, ulcers, fistulas, or blockages. The test results depend on the symptoms. They show tears, bleeding, inflammation, or an obstruction in the lining of the intestine.

X-ray

X-ray captures pictures of the gastrointestinal tract using electromagnetic radiation. It is usually suggested when symptoms like abdominal pain and constipation are caused by dilation of the bowel wall or intestinal obstruction.

CT Or MR Enterography

CT or MR Enterography gives detailed images of the small intestine and can help detect inflammation, narrowing, fistulas, abscesses, or blockages. MR enterography avoids radiation and scans the body with a magnetic field, while CT enterography uses X-rays and is often quicker. Both can be useful, especially when crohn’s disease is suspected.

Capsule Endoscopy

When a problem occurs in the small intestine, capsule endoscopy may be recommended because the small intestine is difficult to visualize. Other parts of the gastrointestinal tract are mostly inaccessible; capsule endoscopy may help assess detailed information about inflammation, ulcers, or bleeding. This procedure includes a small, tablet-sized camera that the doctor asks you to swallow, and it takes about 8 hours to pass through the digestive tract. It captures hundreds of pictures around your digestive tract, then it is excreted through a bowel movement and flushed down the toilet.

How Crohn’s And Ulcerative Colitis Are Classified

Crohn’s disease and ulcerative colitis are classified in different ways because they affect the digestive tract in different patterns. Doctors use the location, extent, severity, and the behavior of the disease to describe each condition. These features are assessed using symptoms, blood tests, stool tests, and imaging tests:

Conditions Doctors Rule Out

Doctors may check for other conditions that can cause symptoms similar to IBD, such as:

• Irritable bowel syndrome (IBS)
• Medical-induced inflammation
• Celiac disease, as it can cause small intestine injury, diarrhoea, and malabsorption.
• Ischemic colitis, as it can cause reduced blood flow, leading to pain and bleeding
• Bacterial infections like Campylobacter, Salmonella, and Shigella, as they cause bloody diarrhea.
• Parasitic infections like Giardia or amebiasis, as they cause digestive distress.
• Gut infection, as it is a signal of mucosal damage.
• Colorectal cancer or polyps because they can cause rectal bleeding and changes in bowel habits.

Questions To Ask After Diagnosis

After diagnosis, ask your doctor these questions because they may help you better understand the problem:

• What type of IBD do I have, and what part of the digestive tract is affected?
• How active or severe is the disease?
• What do my test results show?
• What treatment options are suitable for me?
• What types of medicines do they have, and do they have any side effects? 
• How will you know the treatment is working?
• How long will the treatment take?
• What dietary habits should I follow?
• What should I do if my symptoms get suddenly worse?
• When is follow-up recommended?

Reference

Testing and Diagnosis for Inflammatory Bowel Disease (IBD)

Inflammatory Bowel Disease (IBD): Clinical Diagnosis and Treatment - PMC

The Montreal classification of inflammatory bowel disease: controversies, consensus, and implications - PMC

Diagnostic Procedures for Inflammatory Bowel Disease: Laboratory, Endoscopy, Pathology, Imaging, and Beyond - PMC