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Rapid urease test, also known as the CLO test (Campylobacter-like organism test), is a rapid diagnostic test for diagnosis of Helicobacter pylori. [1] The basis of the test is the ability of H. pylori to secrete the urease enzyme, which catalyzes the conversion of urea to ammonia and carbon dioxide.
Patients swallow urea labelled with an uncommon isotope, either radioactive carbon-14 (nowadays preferred in many countries) or non-radioactive carbon-13.In the subsequent 10–30 minutes, the detection of isotope-labelled carbon dioxide in exhaled breath indicates that the urea was split; this indicates that urease (the enzyme that H. pylori uses to metabolize urea to produce ammonia) is ...
He became ill with nausea and vomiting several days later. An endoscopy 10 days after inoculation revealed signs of gastritis and the presence of H. pylori. These results suggested H. pylori was the causative agent. Marshall and Warren went on to demonstrate antibiotics are effective in the treatment of many cases of gastritis.
The most recent guidelines for managing dyspepsia prohibit endoscopic use in patients under 60 years of age because its low yield, even in cases where alarm symptoms are present. [56] Noninvasive urea breath tests or stool antigen testing for H pylori should be performed on these patients. [15]
They determined that saliva testing for H. pylori antibodies "could be used reliably for screening dyspeptic patients in general practice." [65] That same year Tiwari, et al., examined the accuracy of testing saliva for H. pylori DNA and how well this correlated with presence of H. pylori detected via gastric biopsy.
Gastritis caused by H. pylori infection is termed Helicobacter pylori induced gastritis, and listed as a disease in ICD11. [ 6 ] [ 7 ] More than 80% of individuals infected with the bacterium are asymptomatic and it has been postulated that it may play an important role in the natural stomach ecology.
Recently, a portable medical diagnostic device called "BioPoC" has been reported which employs free-standing enzyme-modified responsive polymer membrane-based biosensors and a newly devised low-cost transduction principle for the detection of H. pylori and urea. [13]
Sensitivity testing results can allow a clinician to change the choice of antibiotics from empiric therapy, which is when an antibiotic is selected based on clinical suspicion about the site of an infection and common causative bacteria, to directed therapy, in which the choice of antibiotic is based on knowledge of the organism and its ...