Estimation of gastric acidity by x-ray.
D001466:Barium Sulfate; D002214:Capsules; D005745:Gastric Acidity Determination; D005780:Gelatin; D006801:Humans; D008722:Methods; D011859:Radiography; D013270:Stomach / Q000000981:diagnostic imaging
D002214:Capsules; D001466:Barium Sulfate; D005780:Gelatin