Gastric biopsy mapping protocol

Gastric biopsies should be obtained from the following sites:
(1) Antrum, greater curvature, within 3 to 5 cm of pylorus
(2) Antrum, lesser curvature, within 3 to 5 cm of pylorus
(3) Incisura angularis
(4) Corpus, lesser curvature
(5) Corpus, greater curvature