# New blood test detects pre-cancerous colorectal lesions with 81% accuracy 2026-08-16T15:21:45+00:00 | Health & Science | Indian Opinion Desk Corroboration: 1 independent outlet An experimental blood test has shown high sensitivity for detecting precancerous colorectal polyps, offering potential for cancer prevention. In a study involving over 1,500 adults in China, Japan, and Spain, the test identified 92% of stage I-III colorectal cancers and 81% of advanced adenomas, according to a report in The Lancet Gastroenterology & Hepatology. The test was also 85% accurate in ruling out precancerous lesions. Researchers not involved in the study called the test a potentially valuable tool for preventing colorectal cancer. Because it distinguishes between low-risk and high-risk adenomas and cancers, the test could help prioritise patients for urgent colonoscopy. Doctors still recommend colonoscopy as the gold standard, with blood tests advised only for patients who cannot or will not undergo the procedure. Larger trials are needed, as the test was less effective at identifying flat, sessile lesions. ## Coverage - health.economictimes.indiatimes.com This story was synthesised by AI from the source linked above. Tags: blood test, China, Colorectal Cancer, Japan, Spain, The Lancet Gastroenterology & Hepatology Canonical: https://indianopinion.org/new-blood-test-detects-pre-cancerous-colorectal-lesions-with-81-accuracy/ License: Summary and commentary (c) Indian Opinion, reusable with attribution. Facts belong to the linked sources. Cite: https://indianopinion.org/new-blood-test-detects-pre-cancerous-colorectal-lesions-with-81-accuracy/#story-in-brief Review state: restored archive article, accurate at time of publication, not offered to search indexes. How this brief was made: an AI model read the report linked above and wrote this summary and analysis, which were published automatically. Published briefs are sampled every hour by an automated quality check; the editor verifies its findings and approves corrections, and corrected briefs carry a dated correction line. We do no original reporting. Methodology: https://indianopinion.org/ai-use-policy/