How Long Does It Take to Get Cologuard Test Results?

Once the laboratory receives your Cologuard sample, results typically arrive within about two weeks. That said, the full timeline from when the kit ships to your door until you and your doctor see a result averages closer to five weeks, according to real-world data from large patient populations. The gap is mostly you: the kit sits on your counter, you find a day to collect the sample, you drop it off for shipping, and the carrier delivers it to the lab. The lab processing itself is a relatively small slice of the total wait.

The Timeline From Start to Finish

Cologuard is an at-home stool DNA test for colorectal cancer screening. The process starts when your healthcare provider places the order and the manufacturer ships a collection kit to your home. Once you collect the sample and send it back in the prepaid shipping box, the lab runs its analysis and reports results to your provider, who then contacts you. Each of those stages adds time.

A study of over 264,000 patients at federally qualified health centers found that the average span from initial kit shipment to a valid test result was about 37 days.¹ A separate analysis of repeat screening patients found the mean time just to return the kit was about 21 days, with wide variation from person to person.² So if you subtract the 21 or so days people spend getting around to collecting and mailing the sample, the lab turnaround plus transit time accounts for roughly two to two-and-a-half weeks.

The manufacturer states that results are typically available within two weeks of the lab receiving the sample. In practice, your provider may reach out by phone, patient portal message, or at a follow-up appointment. If you have not heard anything within three weeks of mailing the kit, calling your doctor’s office is reasonable.

Why Most of the Wait Is on Your End

The biggest variable in the Cologuard timeline is not laboratory science. It is the everyday friction of collecting a stool sample at home. Unlike a blood draw that happens in a clinic in minutes, Cologuard requires you to have the right moment, use the supplied container and preservative correctly, and get the box to a shipping drop-off point the same day. People delay for all sorts of mundane reasons: travel, illness, forgetting, discomfort with the process, or simply procrastinating on something that feels unpleasant.

That delay is reflected in the adherence data. In the large study mentioned above, only about 56% of first-time users who received a shipped kit ended up completing the test at all.¹ Another study at an academic medical center found a completion rate of about 60%, with significant variation across patient groups.³ Among people who had done the test before and were on their repeat cycle, the return rate was higher, around 80%, and those folks returned the kit in an average of 21 days.² In other words, familiarity with the process makes people faster and more likely to follow through.

If your goal is getting results as quickly as possible, the most effective thing you can do is collect the sample within a day or two of the kit arriving and ship it the same day you collect it. The lab and shipping legs of the journey are fairly consistent; the human leg is where weeks can quietly disappear.

What the Lab Is Actually Doing During Those Two Weeks

The reason Cologuard takes longer than a simple blood test is that the lab is running several distinct molecular analyses on your stool sample, not just looking for one thing. The test belongs to a category called multi-target stool DNA testing. It combines an immunochemical test for hemoglobin (blood in the stool) with molecular assays that look for specific DNA changes shed by abnormal cells lining the colon.

The current version of the test checks for methylation changes in specific genes, along with mutations in the KRAS gene and a hemoglobin immunoassay. Earlier generations of the test looked at a broader set of mutations across genes like APC and P53, plus a microsatellite instability marker. Over time, the panel has been refined to improve accuracy while keeping the number of markers manageable.⁴ Each of these assays requires its own sample preparation, amplification, and quality-control steps, which is why the process takes longer than a single-marker stool test like FIT.

The sample also needs to be in good condition when it reaches the lab. Cologuard kits include a preservative buffer that stabilizes DNA during shipping, but extreme temperatures or prolonged transit can occasionally degrade the sample enough that the lab has to request a new one. If you are asked to recollect, that adds another full cycle to the timeline.

What Your Results Will Say

Cologuard results come back as one of three outcomes: negative, positive, or invalid. A negative result means no significant DNA changes or blood were detected. For people at average risk of colorectal cancer, this is the most common outcome, and the recommended screening interval after a negative result is three years.

A positive result does not mean you have cancer. It means the test found DNA markers or blood signals that warrant further investigation, and your doctor will recommend a diagnostic colonoscopy to look directly at the colon lining. The test’s sensitivity for detecting actual colorectal cancer is high, around 94% in a head-to-head comparison with the simpler FIT test, which caught about 67% of cancers in the same study. For advanced precancerous lesions, Cologuard detected roughly 43% compared to 23% for FIT.⁵ The tradeoff is that Cologuard also has more false positives, meaning some people will be sent for a colonoscopy that turns out to find nothing worrisome. That tradeoff between catching more problems and flagging more false alarms is a core feature of how the test is designed.

An invalid result means the lab could not process the sample, usually because of a collection or shipping issue. In that case, a new kit is sent and you start over.

If You Get a Positive Result, Timing of Follow-Up Matters

Waiting weeks for your Cologuard results can feel stressful, but the more consequential timing issue happens after a positive result. The interval between a positive stool-based screening test and the follow-up colonoscopy has a measurable effect on outcomes. A large study looking at patients who tested positive on FIT found that delays beyond six months were associated with worse outcomes at the time of eventual diagnosis. Specifically, waiting 10 to 12 months was linked to higher rates of being diagnosed with colorectal cancer and with more advanced-stage disease, and delays beyond a year were associated with even higher risks across multiple cancer stages.⁶

The researchers concluded that getting a colonoscopy within six months of a positive stool test may minimize the risk of a precancerous lesion progressing, and getting one within three months provides an extra safety margin.⁶ That study looked at FIT rather than Cologuard specifically, but the principle is the same: a positive noninvasive screening test is a referral to colonoscopy, not a final diagnosis, and the value of catching problems early depends on acting on the referral promptly.

If your Cologuard comes back positive, do not treat the follow-up colonoscopy as optional or something to schedule “eventually.” The whole point of screening is catching problems before they become dangerous, and that only works if the chain of events keeps moving. Your doctor’s office should help you schedule the colonoscopy fairly quickly after a positive result. If they do not bring it up proactively, ask.

Factors That Can Delay Results Beyond the Typical Window

Several things can push the timeline beyond the typical two-week lab window:

Shipping delays: The sample ships via standard carrier services, so holidays, severe weather, and regional disruptions can slow transit. Samples collected on a Friday may not move until Monday.
Sample quality issues: If the preservative buffer was not added correctly, the sample container leaked, or the stool was exposed to extreme heat or cold for too long, the lab may flag it as invalid and request a recollection. This resets the clock entirely.
High lab volume: The testing is centralized at Exact Sciences’ laboratories, and during periods of heavy kit returns, throughput can slow slightly. March and April, for example, often see a bump as people act on New Year’s screening resolutions or respond to outreach campaigns.
Provider communication lag: Even after the lab reports results, there can be a gap before your doctor’s office contacts you. Some practices batch their patient callbacks, some rely on portal messages you might not check, and some wait for your next scheduled visit unless the result is positive.

If you want to minimize delays on your end, collect the sample early in the week, ship it the same day, and make sure you have patient portal access set up so you can see results as soon as your provider releases them.

Cologuard Versus Other Screening Options on Speed

If turnaround time is a major concern, it helps to know how Cologuard compares to alternatives. A standard fecal immunochemical test (FIT) involves a much simpler sample, and results often come back within a few days to a week because the lab analysis is less complex. FIT only looks for blood in the stool and does not involve DNA extraction or methylation analysis. The tradeoff, as noted above, is lower sensitivity for both cancer and precancerous lesions.

A screening colonoscopy gives you results essentially in real time: the gastroenterologist can see and remove polyps during the procedure, and preliminary findings are usually discussed with you the same day. Biopsy results from removed tissue take a few additional days. The downside is the prep, the sedation, and the need to take a day off. Colonoscopy is recommended every 10 years for average-risk adults if results are normal, compared to every three years for Cologuard.

Blood-based screening tests for colorectal cancer are a newer category and are beginning to enter the market. Some promise faster turnaround because blood samples are easier to ship and process, but their sensitivity for precancerous lesions is generally lower than stool DNA testing at this stage. They are not yet as widely recommended by major guidelines for routine average-risk screening.

Who Is and Is Not a Good Candidate for Cologuard

Cologuard is approved for adults 45 and older who are at average risk for colorectal cancer. That means no personal history of colorectal cancer or certain polyp types, no inflammatory bowel disease like Crohn’s or ulcerative colitis, and no known hereditary syndromes that raise colorectal cancer risk. If you fall into any of those higher-risk categories, colonoscopy is the recommended screening method, and stool DNA testing is not an appropriate substitute.

People sometimes assume a negative Cologuard result means they can skip screening for a decade the way they might after a clean colonoscopy. That is not the case. The recommended rescreening interval is three years, and sticking to that schedule is part of what makes the test effective over time. The repeat adherence data is encouraging on this front: among people returning for their second round, about 80% completed the test.² That is a meaningfully higher rate than first-time users, suggesting that once people get through the initial unfamiliarity, the process becomes routine.

Disparities in Who Completes the Test

Not everyone who receives a Cologuard kit ends up using it, and the gaps are not random. Research has identified disparities in completion rates across demographic groups. One study found that Black patients had significantly lower odds of completing the test compared to other groups, while Asian patients had notably higher completion rates. Patients who had previously completed any form of colorectal cancer screening were also more likely to follow through.³

Insurance type also plays a role. Patients with Medicare had the highest repeat screening adherence at roughly 85%, while those on Medicaid had the lowest at about 66%.² These gaps matter because colorectal cancer is highly treatable when caught early, and screening tests only save lives if people actually use them. If you are a provider or a patient advocate, understanding these disparities is part of making at-home screening work for the populations that need it most.

When to Call Your Doctor’s Office

There is no universal tracking system that lets you watch your Cologuard sample move through the lab the way you track a package. Some patients receive a shipping confirmation when the lab receives the kit, but not all do. If you have been waiting and are unsure whether to be concerned, a reasonable rule of thumb is to contact your provider if more than three weeks have passed since you mailed the sample and you have not heard anything. Before that point, the wait is within normal range.

If you are checking your patient portal repeatedly and feeling anxious, that is completely normal. Waiting for any medical test result is stressful, and the at-home nature of Cologuard can make it feel more uncertain because there is no clinic visit anchoring the process. Remind yourself that the vast majority of Cologuard results are negative, and that even a positive result is not a cancer diagnosis but a signal to investigate further. The test exists to find things early, when they are most treatable.