Crohn's Disease

Your child's doctor will first do a physical examination and take a medical history. There's no single test for diagnosing Crohn's disease, so if the doctor suspects Crohn's, a series of tests is required to make a definitive diagnosis. Tests may include:

  • Blood Tests — Blood tests check for anemia, which may be a sign of bleeding in the intestines. They can also detect a high white blood cell count or elevated levels of C-reactive protein, both markers of inflammation.
  • Stool Sample — Shows whether there is bleeding, inflammation or infection in the intestines.
  • Magnetic Resonance (MR) Enterography — Provides detailed images of the small bowel that can pinpoint areas of inflammation, bleeding and other problems. Before the test, your child drinks a contrast material (sometimes just milk is enough) to highlight the small bowel in the images. MR enterography is noninvasive and does not involve radiation or expose your child to any radiation.
  • Colonoscopy — Allows the doctor to examine the entire length of the colon, using a long, flexible tube about as thick as your index finger with a tiny video camera and light on the end. Video images from the camera appear on a monitor. A colonoscopy is done under anesthesia in most children.
    As the colonoscope is pulled back out, the doctor gets even better views and can do a more careful examination. The colonoscope may also contain built-in instruments for taking tissue samples. Later, the doctor can further evaluate what's going on by examining these tiny biopsies of the lining (tissue) of the colon under a microscope.
  • Upper Endoscopy (aka esophagogastroduodenoscopy or EGD) — Enables the doctor to examine the upper GI tract, from the mouth through the esophagus, the stomach and the first part of the intestine (as far as the duodenum and sometimes the first part of the jejunum). Like a colonoscopy, this procedure is usually done under anesthesia using a flexible tube with a tiny video camera and a light. Video images are shown on a monitor, and tissue samples can be taken for the doctor to examine later under a microscope.

  • Capsule Endoscopy (or PillCam) — No anesthesia or sedative is needed for this test. The child swallows a capsule containing a light and a camera, which takes pictures of the entire intestinal tract as it travels from the stomach to the colon and eventually out of the body in the stool – typically a four- to five-hour process. (Sometimes a test capsule is given first, to make sure there's no intestinal stricture that might block its passage.) The disadvantage of capsule endoscopy is that no tissue is obtained for later study under a microscope.

    Note: The capsules are quite large, and smaller children can't always swallow them. In that case, the capsule is put into the intestine during an upper endoscopy.

Reviewed by health care specialists at UCSF Benioff Children's Hospital.

Related Information

UCSF Clinics & Centers

Gastroenterology & Nutritional Disorders

Inflammatory Bowel Disease Program
1825 Fourth St., Sixth Floor
San Francisco, CA 94158
Phone: (415) 353-2813
Urgent Appointment Requests:: (415) 353-1235
Fax: (415) 476-1343
Appointment information

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