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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. Culturing the organism is probably the ideal, but the method is slow and expensive. Breath testing is non-invasive, but has a higher cost.
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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