Colorectal Cancer Screening Now Starts at 45: What Changed and Your Options
Morningside Medical Team
Introduction
In 2021, the U.S. Preventive Services Task Force lowered the recommended age to begin colorectal cancer screening from 50 to 45. The change was not arbitrary. Colorectal cancer has been rising steadily among younger adults even as it falls in older ones, and the guideline moved to meet that shift. In practical terms, an extra five years of people, everyone in their late 40s, are now advised to start screening.
Yet most people in that age group have not started, often for a simple reason: they do not realize the recommendation now applies to them. If you are 45 or older and at average risk, screening is a standard, covered part of preventive care. And there is more than one way to do it.
At Morningside Medical, we talk with patients every week who are surprised to learn the age changed, and who feel a little uneasy about being offered a cancer screening earlier than they expected. This article is meant to settle that unease. We will walk through what changed and why, what the screening options actually are, how they differ, and how a single primary care visit turns that menu of options into a plan that fits your life.
What Changed, and Why 45
For years, the standard advice was to begin colorectal cancer screening at 50 for adults at average risk. In its 2021 recommendation, the U.S. Preventive Services Task Force kept that advice for ages 50 to 75 and added a new group: adults aged 45 to 49. That means five more years of eligibility, applied to everyone, not just people with a family history or other risk factors.
It helps to understand how the Task Force grades its advice, because the grade tells you how strong the evidence is and, quietly, whether insurance has to cover it. Screening for ages 50 to 75 carries a Grade A, meaning there is high certainty of a substantial benefit. The new 45-to-49 group carries a Grade B, meaning moderate certainty of a moderate benefit. Both A and B are recommendations to screen. The distinction matters for a reason that affects your wallet: under the Affordable Care Act, private insurers must cover preventive services graded A or B without cost sharing. So screening at 45 is not only recommended, it is covered.
The reasoning behind the change is worth stating plainly, because it reframes what a screening invitation means. The guideline changed. You did not. Being offered a colorectal cancer screening at 45 is not a sign that a clinician suspects something is wrong. It is the new routine, the same way a first mammogram or a first cholesterol panel arrives on a schedule rather than in response to a symptom.
The peer-reviewed statement of record for this recommendation was published in JAMA in 2021, and it lays out both the evidence and the trade-offs across the different screening methods. It is a useful anchor if you ever want to read the primary source rather than a summary of it.
The Reason Behind the Change: Early-Onset Colorectal Cancer
The age moved because the disease itself is moving. For decades, colorectal cancer was largely a concern of later life, and screening at 50 caught most of it. That picture has shifted. According to the American Cancer Society, colorectal cancer incidence is now rising by roughly 3 percent per year in adults aged 20 to 49, even as it falls by about 2.5 percent per year in adults 65 and older. The trend among the oldest adults is genuinely good news, and it reflects decades of screening working as intended. The trend among younger adults is the reason the starting line moved.
Another way to see the same shift: the share of colorectal cancer diagnoses occurring in adults under 55 has roughly doubled over recent decades. We phrase that directionally on purpose, because the exact figures depend on how and when they are measured. The direction, though, is clear and consistent across sources, and it is what prompted expert panels to bring the screening age down.
None of this means younger adults should be alarmed. Colorectal cancer remains far more common later in life, and the absolute risk for a healthy person in their late 40s is still low. What the data support is a sensible response: start screening a few years earlier so that the cancers that do occur in this age group have a better chance of being caught early, when they are most treatable, or prevented outright by removing precancerous growths before they turn.
Most Newly Eligible Adults Have Not Been Screened
Here is the gap the guideline change has not yet closed. Even though screening at 45 has been recommended and covered for several years now, uptake in the newly eligible age group remains low. Data from the CDC's Behavioral Risk Factor Surveillance System found that in 2022, only about 30 percent of adults aged 45 to 49 were up to date with colorectal cancer screening, compared with roughly two-thirds of adults aged 50 to 64 and more than 80 percent of those aged 65 to 75. In other words, nearly two-thirds of the newly eligible group had never been screened at all.
There is an encouraging countercurrent. A 2025 analysis in JAMA tracking national trends found that screening in adults aged 45 to 49 rose from about 21 percent in 2019 to nearly 34 percent in 2023, with much of the growth coming from at-home stool tests. So the number is climbing since the guideline changed. It is simply climbing from a low base.
Put those two findings together and the summary is clear: fewer than a third of adults in their late 40s are currently up to date with screening, though the figure has been rising each year. Most of the people who fall in that gap are not avoiding screening out of fear. They just have not been told the recommendation applies to them yet. That is exactly the kind of thing a primary care visit is built to catch.
Your Screening Options, and What Sets Them Apart
One of the most reassuring facts about colorectal cancer screening is that there is no single mandatory test. The Task Force endorses several methods, and the choice among them is about trade-offs, not about one being the only right answer. What matters most is picking a test you will actually complete, and then completing it on schedule. As the saying goes among clinicians, the best screening test is the one that gets done. An at-home test done reliably every year protects you far more than a colonoscopy you keep postponing.
Here is how the main options compare.
Colonoscopy, every 10 years
A colonoscopy uses a thin, flexible camera to examine the entire colon. Its defining strength is that it is both a test and a treatment in one sitting: if the clinician finds a precancerous polyp, it can be removed on the spot. That makes colonoscopy uniquely preventive, because it can stop a cancer from ever forming rather than only finding one that already has. The trade-offs are the ones people tend to worry about. It requires bowel preparation the day before, it usually involves sedation, and it means arranging time off and a ride home. In exchange, a normal result buys you ten years before the next one.
Fecal immunochemical test (FIT), every year
The FIT is an at-home stool test that detects hidden blood, an early clue of colorectal cancer. There is no bowel prep and no sedation; you collect a small sample at home and mail it to a lab. Its trade-off is frequency and sensitivity: it must be repeated every single year to stay effective, and a single FIT catches somewhat less than a colonoscopy does. Done faithfully on an annual schedule, though, it is a well-proven way to screen.
Stool DNA test, every 1 to 3 years
This at-home test, sometimes called a multitarget stool test, looks for both hidden blood and DNA markers shed by abnormal cells. A single stool DNA test has a higher chance of detecting an existing cancer than a single FIT. The trade-off is that it also produces more false positives, meaning it is more likely to flag something that turns out to be nothing. It still requires no prep and no sedation, and it is repeated less often than the yearly FIT.
CT colonography, every 5 years
Also called a virtual colonoscopy, this method uses a CT scanner to create detailed images of the colon. It requires bowel preparation but no sedation. Because it is an imaging study, it occasionally turns up findings outside the colon that may need follow-up. It is a reasonable option for people who cannot or prefer not to undergo a standard colonoscopy.
Flexible sigmoidoscopy
This examines only the lower portion of the colon and is used less often in the United States today. It can be combined with an annual stool test. For most patients weighing options, the decision comes down to the choices above.
The one rule that ties them all together
There is a single point that matters more than any comparison of sensitivity numbers: if you choose any test other than a colonoscopy and the result comes back abnormal, the next step is a colonoscopy to complete the screening. A positive stool test or an abnormal CT colonography is not a diagnosis. It is a signal that the process is not finished. Screening only delivers its benefit if that follow-up happens, so it is worth knowing up front that a non-colonoscopy test can become a two-step process. Setting that expectation early keeps a positive result from feeling like a shock, and keeps people from treating an at-home test as the whole answer.
Who This Advice Is For, and Who Needs More
Everything above applies to adults at average risk, meaning people without a personal or family history that raises their odds. Not everyone falls into that group, and the plan changes for those who do not.
If you have a first-degree relative who had colorectal cancer or advanced polyps, a personal history of inflammatory bowel disease such as Crohn's disease or ulcerative colitis, certain inherited genetic syndromes, or your own history of polyps, you may need to start screening earlier than 45, screen more often, or use a specific test rather than choosing freely from the menu. This is not something to sort out on your own from an article. It is a conversation to have with a clinician who can look at your full history and tailor the interval and the method to your situation.
There is also an important line between screening and diagnosis that everyone should know. Screening is for people who have no symptoms. If you are noticing rectal bleeding, blood in your stool, a persistent and unexplained change in your bowel habits, unintended weight loss, or you have been told you have iron-deficiency anemia, that is a different situation entirely. Those are reasons to seek a diagnostic evaluation now, regardless of your age and regardless of any screening schedule. Do not wait for a screening interval to come up, and do not assume a normal stool test from last year settles the question. Symptoms deserve their own visit.
How a Primary Care Visit Turns Options Into a Plan
Reading about five screening methods can feel like being handed a menu in a language you do not fully speak. That is precisely where a primary care visit earns its keep. The clinician's job is to translate the menu into a single clear recommendation for you.
In a typical visit, a few things happen. First, the clinician confirms whether you are actually at average risk by reviewing your family history and your own medical background, which decides whether you can choose freely or need a tailored approach. Next, you talk through the options and their trade-offs in the context of your real life: your comfort with a procedure, your ability to take a day for prep and sedation, whether you would reliably keep up an annual at-home test, and what your insurance covers. From there, the clinician either orders the test or arranges the referral, and just as importantly, makes sure the result is followed up, including the colonoscopy that comes next if an at-home test is positive.
This is also the visit where the broader picture comes into focus. Colorectal cancer screening rarely stands alone. It usually sits alongside blood pressure, cholesterol, blood sugar, and other checks that make up preventive care in your 40s and 50s. If you want a sense of what else belongs on that list, our overview of the baseline tests a primary care doctor recommends is a good companion, and colorectal screening slots naturally into the rhythm of an annual physical. Bundling these conversations into one visit is far easier than chasing each one separately.
How Morningside Can Help
At Morningside Medical, we see colorectal cancer screening as a routine, welcome part of caring for adults, not a source of worry. If you are 45 or older and have not been screened, you do not need to arrive with a decision already made. That is our job to help with. We will confirm your risk level, walk you through the options in plain language, and land on the approach you are most likely to stick with, whether that is a colonoscopy every ten years or an at-home test you complete on schedule. If an at-home test ever comes back positive, we make sure the follow-up colonoscopy actually happens, because a screening plan is only as good as its last step.
Our adult primary care team at our Harlem office cares for patients across New York City, and we are glad to make this one of the things we handle for you, along with the rest of your preventive care. If you have been meaning to ask about colorectal cancer screening, or you only just learned the age moved to 45, this is a good moment to start the conversation.
This article is for general information and is not a substitute for professional medical advice. Talk to your clinician about your specific situation.
