Getting tested for prostate cancer typically starts with a simple blood draw called a PSA test, often combined with a physical exam. From there, your doctor may recommend imaging or a biopsy depending on the results. The process is straightforward, but knowing when to start, what each step involves, and how to prepare can help you make informed decisions.
The PSA Blood Test
The first step in prostate cancer screening is a prostate-specific antigen (PSA) test. PSA is a protein produced by your prostate, and small amounts of it naturally end up in your blood. The test itself takes less than five minutes: a healthcare provider draws a small blood sample from your arm, which is then sent to a lab to measure the PSA concentration in nanograms per milliliter (ng/mL).
A higher PSA level doesn’t automatically mean cancer. Infections, an enlarged prostate, recent physical activity, and even ejaculation can temporarily raise your PSA. To get the most accurate reading, you should avoid ejaculation for at least 24 hours before the test. Some guidelines recommend abstaining for three days. Vigorous exercise, particularly cycling, can also affect results.
What counts as a “normal” PSA depends on your age. Established upper limits for reference are roughly 2.5 ng/mL for men in their 40s, 3.5 ng/mL in their 50s, 4.5 ng/mL in their 60s, and 6.5 ng/mL in their 70s. These thresholds aren’t hard cutoffs. A PSA of 3.0 in a 45-year-old is more concerning than the same number in a 65-year-old.
The Digital Rectal Exam
Your doctor may also perform a digital rectal exam (DRE), usually at the same visit as the blood draw. During this exam, the doctor inserts a gloved, lubricated finger into the rectum to feel the back surface of the prostate. They’re checking for unusual size, hard spots, or nodules in the tissue. The exam reaches about 7 to 8 centimeters into the rectum and takes under a minute.
A DRE can catch some cancers that don’t raise PSA levels, and a PSA test can flag cancers too deep for a finger to reach. Neither test alone is definitive, which is why they’re often used together.
When to Start Screening
For men at average risk, the U.S. Preventive Services Task Force recommends discussing PSA screening with a doctor between ages 55 and 69. This is framed as a personal decision because screening catches some slow-growing cancers that may never cause harm, and follow-up procedures carry their own risks. For men 70 and older, routine PSA screening is generally not recommended.
If you’re at higher risk, screening should start earlier. Black men develop prostate cancer at higher rates, and research suggests the disease begins forming 3 to 9 years earlier in Black men than in the general population. Most guidelines recommend Black men consider starting screening around age 45. The same applies if you have a father or brother who was diagnosed with prostate cancer, especially if they were diagnosed young. A strong family history or known genetic mutations can push that conversation even earlier.
How Often to Get Tested
If your PSA comes back below 2.5 ng/mL, the American Cancer Society suggests retesting every two years. If your PSA is 2.5 ng/mL or higher, annual screening is recommended. Your doctor may adjust this schedule based on your age, risk factors, and how your PSA trends over time. A PSA that rises steadily over several years can be more informative than any single reading.
What Happens if Your PSA Is Elevated
An elevated PSA doesn’t send you straight to a biopsy anymore. Doctors now have several intermediate steps to figure out whether a biopsy is actually needed. One of the most common is a multiparametric MRI, a specialized scan of the prostate that highlights suspicious areas. Radiologists score each area on a scale called PI-RADS, from 1 (very unlikely to be cancer) to 5 (very likely). A low score may mean you can skip the biopsy entirely and simply monitor with repeat testing.
There are also secondary biomarker tests that help refine the picture when PSA results fall into a gray zone. These include blood tests like the Prostate Health Index (PHI) and the 4Kscore, as well as urine-based tests like SelectMDx and ExoDx. These tests combine multiple markers with clinical information like your age, PSA level, and prostate size to estimate your individual probability of having a cancer that actually needs treatment. They’re designed to reduce unnecessary biopsies by identifying men who can safely wait and watch.
The Biopsy
If imaging or biomarker tests suggest a significant cancer is likely, the next step is a prostate biopsy. A doctor uses a thin needle to collect small tissue samples from the prostate, which a pathologist then examines under a microscope. This is the only way to definitively confirm prostate cancer and determine how aggressive it is.
There are two main approaches. The traditional method, called transrectal biopsy, inserts the needle through the rectal wall. It’s effective under local anesthesia, but because the needle passes through the rectum, it carries a 2 to 5 percent risk of infection, including serious bloodstream infections. The newer approach, transperineal biopsy, accesses the prostate through the skin between the scrotum and rectum, which virtually eliminates rectal contamination. A large meta-analysis found that severe infections like sepsis were 65 percent less likely with the transperineal approach. Many centers have shifted to this method as the default.
The tradeoff is comfort. Transperineal biopsy tends to cause more discomfort during and immediately after the procedure, with patients reporting roughly twice the odds of significant pain compared to the transrectal method. By one week after the procedure, pain levels between the two approaches are no longer meaningfully different. Most transperineal biopsies are performed under local anesthesia, though some centers use general or spinal anesthesia.
After either type of biopsy, you can expect some blood in your urine, semen, or stool for a few days to a couple of weeks. Results typically come back within a week or two, and your doctor will walk you through what the tissue samples showed and what, if anything, comes next.
Putting the Steps Together
The path from first screening to diagnosis follows a logical sequence: PSA blood test and possibly a DRE, then secondary biomarker tests or an MRI if something looks borderline, then a biopsy only if there’s genuine suspicion of clinically significant cancer. Not every man with an elevated PSA will need a biopsy, and not every biopsy will find cancer. The goal of modern screening is to catch dangerous cancers early while avoiding unnecessary procedures for cancers that would never cause problems. Starting that conversation with your doctor at the right age, based on your personal risk, is the most important first step.