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How is an H. pylori-induced ulcer diagnosed?


Answers From Experts & Organizations (1)

443 Answers
24,547 Helpful Votes

Noninvasive Techniques

If a patient has peptic ulcer symptoms, the doctor first asks about use of over-the-counter and prescription NSAIDs. Patients who are taking an NSAID are asked to stop, reduce the dose, or switch to another medication.

Then the doctor tests to see if H. pylori is present. Testing is important because H. pylori-induced ulcers are treated differently than ulcers caused by NSAIDs.

Doctors use one of three simple, noninvasive tests to detect H. pylori in a patient's blood, breath, or stool. Because the breath test and stool test more accurately detect H. pylori than the blood test, some doctors prefer to use one of these two tests. Each test described below is easily performed, often in an outpatient setting such as a doctor's office or lab.

Blood test. A blood sample is taken from the patient's vein and tested for H. pylori antibodies. Antibodies are substances the body produces to fight invading harmful substances—called antigens—such as the H. pylori bacterium.

Urea breath test. The patient swallows a capsule, liquid, or pudding that contains urea “labeled” with a special carbon atom. After a few minutes, the patient breathes into a container, exhaling carbon dioxide. If the carbon atom is found in the exhaled breath, H. pylori is present, as this bacterium contains large amounts of urease, a chemical that breaks urea down into carbon dioxide and ammonia.

Stool antigen test. The patient provides a stool sample, which is tested for H. pylori antigens.

Invasive Techniques

If a patient has any alarm symptoms, the doctor orders an endoscopy or upper gastrointestinal (GI) series. Many doctors also recommend these tests for patients who first experience peptic ulcer symptoms around age 50. Often performed as outpatient procedures in a hospital, both procedures are painless and allow the doctor to look inside the patient's stomach and duodenum.

For an endoscopy, the patient is lightly sedated. The doctor passes an endoscope—a thin, lighted tube with a tiny camera on the end—into the patient's mouth and down the throat to the stomach and duodenum. With this tool, the doctor can closely examine the lining of the esophagus, stomach, and duodenum.

The doctor can use the endoscope to take photos of ulcers or remove a tiny piece of tissue—no bigger than a match head—to view with a microscope. This procedure is called a biopsy. The biopsied tissue is examined to see if H. pylori is present.

If an ulcer is bleeding, the doctor can use the endoscope to inject medicines that help the blood clot or to guide a heat probe that burns tissue to stop bleeding—a process called cauterization.

For an upper GI series, the patient drinks a white, chalky liquid called barium. The barium makes the esophagus, stomach, and duodenum and any ulcers show up on an x ray. Sedation is not necessary for this procedure.

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