Blood testing is not reliable for post-treatment H. pylori diagnosis/rediagnosis. Nearly all studies have found that successful treatment is associated with a 40 to 50% decrease in IgG levels by 6 months post-treatment. However, only about 25% of successfully treated patients show a complete disappearance of IgG antibodies, even when measured 3.5 years after treatment. … Continue reading Post Treatment H. pylori Testing