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Persons infected with H. pylori develop serum antibodies to the organism that can be detected in the blood. Serological testing for H. pylori is only one of a number of diagnostic techniques that can be used. Breath testing is non-invasive, but has a higher cost. Saliva testing, though becoming more popular, is still not widely available. Blood testing for circulating antibodies to H. pylori is cheap, quick, readily available and non invasive (other than the blood collection).
It is now possible to have a test in a doctor's office performed on just one drop of blood.
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