This is a study to build up a technical procedure for taking gastric juice via gastroscope and measuring pH on 438 patients with gastro-duodenal erosion or ulcer at Bac Giang General Hospital. Results: the technique of taking gastric juice by leading the tip of gastroscope in the “liquid puddle” and then sucking gastric juice through biopsy canal by a syringe of 100ml had been 94.6% successful; this technique is simple and easy to do. Measuring pH of gastric juice on 363 patients with gastro-duodenal erosion or ulcer found no patient with pH<1; over 80% of them were found with gastric juice pH 1 to 3; pH of gastric juice has no relation with age and sex
Peptic Ulcer ; Gastric Acid