New Blood Tests Make Colon Cancer Screening Easier at 45

Colon cancer screening just became more accessible for millions of Americans, and that's saving lives.

The American Cancer Society updated its screening guidelines this week to include a simple blood test that can detect cancer DNA right in your doctor's office. The organization also endorsed at-home stool tests that look for hidden blood and cancer markers. Both options join the traditional colonoscopy as recommended ways to screen starting at age 45.

Dr. Robert Smith, who leads early cancer detection science at the American Cancer Society, says the goal is making screening easier for everyone. "By offering more screening tools, more eligible adults will be able to participate in lifesaving colorectal cancer testing," he explained in a statement.

The timing couldn't be better. Colon cancer has become the leading cancer killer of adults under 50, yet one in three eligible Americans have never been screened. Recent research shows diagnoses jumped 50% among people aged 45 to 49 between 2021 and 2022.

The numbers tell a powerful story about why screening matters. When caught early, more than 90% of patients survive at least five years. That's why the American Cancer Society calls colon cancer "a highly preventable disease as much as a treatable one."

The Bright Side

These new options mean fewer barriers between people and potentially lifesaving tests. No time for a colonoscopy? A blood test during your annual checkup works. Uncomfortable visiting a clinic? An at-home test can detect problems before symptoms appear.

Dr. William Dahut, chief scientific officer at the American Cancer Society, emphasized that the test itself matters less than actually getting screened. "No matter which test you choose, what's most important is to get screened," he said, particularly highlighting underserved, rural, and minority populations who face the biggest screening gaps.

Doctors still don't fully understand why colon cancer cases are rising in younger adults. Dr. Aparna Parikh from Mass General Cancer Center points to a mix of factors including diet, environmental exposures, possible antibiotic use, and lifestyle choices.

The symptoms to watch for include changes in bowel habits, unexplained fatigue, stomach pain, rectal bleeding, weakness, and unexpected weight loss. But early stage cancer often shows no symptoms at all, making regular screening the best defense.

The American Cancer Society recommends screening continue through age 75 for people expected to live at least 10 more years. Those at higher risk may need to start before 45 or screen more frequently.

More options mean more lives saved, one simple test at a time.