Understanding Lab Tests for Gastric Cancer
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Gastric cancer, also known as stomach cancer, is typically diagnosed through imaging studies and tissue biopsies. While there is no single blood test that can definitively diagnose gastric cancer, laboratory testing plays a fundamental role in monitoring tumor markers, assessing risk factors, and tracking treatment response.
Top Recommended Test
Carcinoembryonic Antigen (CEA)
This test measures CEA levels in the blood, which may be elevated in individuals with gastric cancer. While not a definitive diagnostic tool, CEA serves as an important tumor marker that can aid in monitoring disease progression and treatment response.
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The Role of Blood Testing in Gastric Cancer Management
Blood tests are essential for measuring specific proteins called tumor markers that may be elevated in gastric cancer patients. These tests also help identify risk factors like H. Pylori infection, which can increase the likelihood of developing gastric cancer. While not diagnostic on their own, these tests provide valuable information for monitoring disease progression and treatment effectiveness.
Other Relevant Tests
Carbohydrate Antigen (CA) 19-9
CA 19-9 is a tumor marker that is often increased in individuals with gastric cancer. Although it's not specific to gastric cancer and can be elevated in other conditions, it's valuable for monitoring treatment response and disease progression when used alongside other clinical assessments.
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H. Pylori Antigen Stool
This test detects H. Pylori bacteria, which causes chronic infection that can significantly increase the risk of developing gastric cancer due to ongoing inflammation in the stomach lining. Identifying and treating H. Pylori infection is an important preventive measure.
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Understanding Tumor Markers
Tumor markers like CEA and CA 19-9 are proteins that may be produced by cancer cells or by the body in response to cancer. Elevated levels can indicate the presence of cancer, but they can also be elevated due to benign conditions. These markers are most useful when monitored over time to track changes in cancer status.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment. Gastric cancer diagnosis requires comprehensive evaluation including imaging and tissue analysis.
