Breath test overview

Breath test is a non-invasive and convenient medical testing method that diagnoses diseases or evaluates physiological functions by analyzing specific components in the patient's exhaled breath. The core principle is that certain gases (such as hydrogen, methane, carbon isotope-labeled carbon dioxide, etc.) produced during human metabolism will be expelled with exhalation. By detecting these markers, the presence of Helicobacter pylori infection, lactose intolerance, small intestinal bacterial overgrowth and other diseases can be determined. Main types includeUrea breath test(Helicobacter pylori detection),hydrogen breath test(carbohydrate malabsorption) andCarbon 13 Breath Test(liver function assessment). This technology is widely used in clinical applications due to its simple operation and high safety.

Principles and types of breath tests

Breath testing is based on the correlation of the body's metabolites with exhaled gases. Taking Helicobacter pylori testing as an example, patients takeCarbon 13 or Carbon 14 labeled ureaAfter taking the reagent, if Helicobacter pylori is present in the stomach, the urease secreted by it will decompose urea to produce labeled carbon dioxide. The diagnosis can be confirmed by detecting the labeled amount of carbon dioxide in the exhaled breath with a mass spectrometer or infrared analyzer. The hydrogen breath test determines the intestinal digestion ability of lactose or fructose by monitoring changes in hydrogen concentration in exhaled breath. Different tests have different detection markers and applicable diseases, but they all rely on high-precision gas analysis technology.

Clinical applications and advantages

Breath testing is particularly prominent in the diagnosis of digestive system diseases.Urea breath testIt is the first-line diagnostic method for Helicobacter pylori infection, with an accuracy rate of over 95%;hydrogen breath testCan assist in diagnosing lactose intolerance and irritable bowel syndrome. Compared with traditional methods such as gastroscopy and blood testing, the breath test does not require invasive operations, can be used safely by children and pregnant women, and most results are available within 30 minutes. For example,Carbon 13 Breath TestBecause it is non-radioactive, it is more suitable for children and repeated testing. Some tests (such as hydrogen breath) need to be performed on an empty stomach, and patients need to prepare in advance according to the doctor's instructions.

Applicable groups and precautions

Breath test is suitable for patients with suspected gastrointestinal diseases, such as those with recurrent abdominal pain and bloating, or those who need to evaluate the efficacy of Helicobacter pylori eradication. However, certain circumstances may affect the accuracy of the results: such as recent use of antibiotics, acid-suppressing drugs (these need to be discontinued for 2-4 weeks), or smoking or strenuous exercise before the test. In addition, the Carbon 14 breath test contains trace amounts of radioactivity, so pregnant women and infants should avoid it. Currently, commonly used products in China includeUrea [13C] breath test reagent from Shenzhen CNNC Headway Biotechnology Co., Ltd.,Hydrogen breath detector from Beijing Huagen HoldingsWait.

Summary and Outlook

Breath test has become an important tool in modern medicine due to its non-invasive and efficient characteristics, especially for the screening of common diseases such as Helicobacter pylori. As technology advances, the discovery of more markers, such as acetone for diabetes monitoring, will further expand its application. However, it should be noted that the interpretation of results needs to be combined with clinical symptoms and other examinations when necessary. In the future, the development of portable home breath testing equipment may make early screening of diseases more popular.

Quote sources:1. "China Consensus Opinion on the Diagnosis and Treatment of Helicobacter pylori Infection" (Digestive Disease Branch of the Chinese Medical Association) 2. American College of Gastroenterology (ACG) Clinical Guidelines on Hydrogen Breath Test 3. Manufacturers' published product instructions (official websites of CNNC Headway and Huagen Holdings)