Hematological parameters, serum iron and vitamin B12 levels in hospitalized Palestinian adult patients infected with Helicobacter pylori: a case-control study

H. pylori infection appears to cause decreases in vitamin B12, iron levels and some hematological parameters. However, these were almost normalized after treatment with omeprazole, amoxicillin and clarithromycin. H. pylori is associated with vitamin B12 and iron deficiency, thus, this may be a useful marker and a possible therapeutic agent of anemic patients with gastritis.