Wang YK, et al. - Authors undertook an inspection of the gastric juice malondialdehyde (MDA) levels in relation to H. pylori infection and associated gastric diseases in patients undergoing endoscopy. The gastric juice MDA levels were determined by high-performance liquid chromatography (HPLC) system. It was deduced that malondialdehyde levels in gastric juice were substantially higher in chronic gastritis patients with H. pylori infection compared to those without H. pylori infection. Malondialdehyde in gastric juice demonstrated the potential as a diagnostic biomarker for H. pylori infection and associated gastric diseases. A proportional rise was noted in the gastric juice MDA levels with the severity of gastric diseases.