Gastric Antrum Biopsy: Understanding the Procedure & Purpose

Gastric Antrum Biopsy: Indications, Procedure, and Interpretation

The gastric antrum is the distal, pyloric portion of the stomach. Biopsy via upper endoscopy (EGD) is a cornerstone of diagnosing antral pathology.

Key Indications

• Helicobacter pylori: Gold standard for active infection (rapid urease test, histology, culture).
• Gastritis typing: Chronic (H. pylori, autoimmune), acute (NSAIDs, alcohol, stress), metaplastic (intestinal, pseudopyloric).
• Dysplasia/Neoplasia: Surveillance for intestinal metaplasia, detection of early gastric cancer (WELL-DIFFERENTIATED vs. POORLY-DIFFERENTIATED).
• Ulcer evaluation: H. pylori, malignancy exclusion, NSAID effect.
• Unexplained symptoms: Nausea, vomiting, early satiety, weight loss (rule out celiac, Crohn's, eosinophilic gastritis).

Procedure

1. Conscious sedation or monitored anesthesia.
2. Endoscope passed to antrum; visualized in retroflexion and forward view.
3. 2–6 biopsies taken (standard: 2 antrum, 2 corpus, ± incisura, ± duodenum) using jumbo forceps.
4. Specimens placed in formalin (histology) or transport media (culture/PCR).

Histologic Assessment (Updated Sydney System)

Graded 0–3 for: inflammation, activity, atrophy, intestinal metaplasia, H. pylori density. Guides management and surveillance intervals (OLGA/OLGIM staging).

Risks

Bleeding (rare, self-limited), perforation (<0.1%), sedation complications. Benefits far outweigh risks for indicated patients.