The goal of the study is to understand whether blood levels of hormones produced or metabolized in the stomach reflect the health of the stomach lining. Specifically the study will determine whether the concentration of ghrelin, gastrin, pepsinogens and vitamin B12 reflect the condition of the stomach lining. Hormone concentrations for people with normal/mild gastritis will be compared to people with long-term inflammation of the stomach (chronic atrophic gastritis), and people with pre-cancerous cellular changes (intestinal metaplasia).
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Serologic concentrations of ghrelin, gastrin, pepsinogens and vitamin B12
Timeframe: Measurements will be made on conclusion of the study, one year after enrollment begins