New Blood Test for Colorectal Cancer Shows Promise in Early Detection, Study Finds

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A blood test, developed by Guardant Health, was found to be 83% effective in detecting colorectal cancer in people confirmed to have the disease. Here's what you need to know about the blood test, and when it may be approved.

Nick Blackmer is a librarian, fact-checker, and researcher with more than 20 years of experience in consumer-facing health and wellness content.A new blood test was found to be 83% effective in detecting colorectal cancer in people confirmed to have the disease.

The most common screening options currently include colonoscopies and stool tests. “We know that the more screening test options people have, the more likely they are to participate in cancer screening,” Grady said.For the study, researchers tested the blood of about 7,800 people at average risk of CRC, meaning they had no family or personal history of the disease, nor did they have inflammatory bowel disease or any genetic syndromes putting them at an increased risk.

The team found that the blood test’s sensitivity was 83%, and the specificity—or ability to find a negative result in disease-free people—was 90%, according to Grady. And if a blood test does come back positive, people would still need to undergo a colonoscopy to see if they have precancerous lesions, which the blood test can’t typically detect.

 

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