Determining pH of gastric juice and pepsin with the method of accurate pH test paper and kinetic,gastric juice on an empty stomach is drawed through gastroscope. They are compared among the aged group,middle aged group and youngsters group.

• 方法 :经胃镜抽取空腹胃液 ,以精密pH试纸及动力法测定胃液 pH值和胃蛋白酶 ,以老年组与中年组及青少年组对比。