How effective is an H. pylori breath test for peptic ulcer?

The breath test identifies active H. pylori by measuring a change in breath gases after a prepared drink. A positive result means the bacteria are present and may be contributing to ulcer disease. It does not show whether an ulcer is present, how large it is, or whether it is bleeding. Other causes of peptic ulcers include regular use of some anti-inflammatory pain medicines and conditions that increase acid production, so a negative breath test does not rule out an ulcer.

Tell your clinician about pain medicines, antibiotics, acid reducers, bismuth, and previous ulcer or H. pylori treatment. Follow instructions about fasting and medicine changes because suppression of the bacteria can affect the result. If infection is found, your clinician may recommend eradication treatment and follow-up testing. If an ulcer is suspected from symptoms or previous findings, other assessment may be needed to examine the upper digestive tract and check for bleeding.

Seek emergency help for vomiting blood or material resembling coffee grounds, black sticky stools, sudden severe abdominal pain, fainting, or unusual weakness. Contact a clinician soon for persistent burning upper-abdominal pain, repeated vomiting, difficulty swallowing, or unexplained weight loss. Ulcer complications can occur even if a breath test is negative.

Ask whether your symptoms require ulcer assessment, which pain relievers are safer for you, and when to repeat testing after any H. pylori treatment.