A prostate exam typically involves two parts: a physical exam where a doctor feels the prostate through the rectum, and a blood test that measures a protein produced by the prostate. Together, these tests help detect prostate cancer, an enlarged prostate, or other issues early. The whole process takes only a few minutes, and while it can feel awkward, it’s one of the simplest screening tools in medicine.
The Two Parts of a Prostate Exam
When people say “prostate exam,” they usually mean one or both of these tests:
- Digital rectal exam (DRE): Your doctor inserts a gloved, lubricated finger into your rectum to physically feel the prostate gland, which sits just in front of the rectum. They’re checking for unusual bumps, hard spots, or enlargement.
- PSA blood test: A standard blood draw that measures prostate-specific antigen, a protein your prostate naturally produces. Higher-than-normal levels can signal cancer, infection, or a benign enlarged prostate.
Neither test alone is definitive. A normal PSA doesn’t guarantee you’re cancer-free, and an abnormal one doesn’t mean you have cancer. The two tests work best as a combined first look.
What the Physical Exam Feels Like
For the DRE, you’ll be asked to stand and lean forward over the exam table, or lie on your side with one knee bent toward your chest. Your doctor will apply lubricant and gently insert one finger. The exam itself lasts roughly 10 to 15 seconds.
Most people feel pressure and a brief urge to urinate. It shouldn’t be painful, though it can be uncomfortable. If you experience significant pain during the exam, that’s worth mentioning to your doctor, as it could point to inflammation or another issue. The discomfort ends the moment the exam does, and there’s no recovery time. You can go right back to your day.
How to Prepare
If your visit includes a PSA blood test, your doctor may ask you to avoid ejaculation for 48 hours beforehand. Ejaculation temporarily raises PSA levels and could skew your results. Certain medications and even vigorous exercise can also affect PSA, so let your provider know about anything unusual in the days before your appointment. No special preparation is needed for the physical exam itself.
What Normal and Abnormal Results Look Like
During the DRE, your doctor is feeling for a smooth, walnut-sized gland. Abnormal findings might include hard nodules, asymmetry, or a prostate that’s noticeably larger than expected. None of these findings on their own confirm cancer. An enlarged prostate is extremely common in older men and is often benign.
For the PSA blood test, what counts as “normal” shifts with age. According to Johns Hopkins Medicine guidelines, a PSA above 2.5 ng/mL is considered elevated for men in their 40s and 50s, while for men in their 60s the threshold rises to 4.0 ng/mL. A PSA that jumps more than 0.35 ng/mL in a single year may also warrant further testing, even if the total number looks normal. PSA levels fluctuate for many reasons that have nothing to do with cancer, including prostate infections, recent ejaculation, and normal age-related prostate growth.
What Happens if Something Looks Abnormal
An abnormal PSA or DRE doesn’t mean you have prostate cancer. It means your doctor needs more information. The next step is usually a referral to a urologist, who may order imaging or a biopsy.
An MRI is commonly used to get a detailed picture of the prostate and identify suspicious areas. A specialized version called multiparametric MRI scores regions of the prostate on a 1-to-5 scale, with 1 meaning cancer is very unlikely and 5 meaning it’s very likely. This helps doctors decide whether a biopsy is necessary and, if so, exactly where to target it.
If a biopsy is needed, a doctor uses ultrasound, MRI, or a combination of both to guide a thin needle into the prostate and collect small tissue samples, typically around 12 from different areas. The needle can go through the rectal wall or through the skin between the scrotum and anus. The tissue samples are then examined under a microscope. A biopsy is the only way to confirm a prostate cancer diagnosis.
When to Start Screening
The U.S. Preventive Services Task Force recommends that men between 55 and 69 make a personal, informed decision about PSA screening after discussing the tradeoffs with their doctor. There is no blanket recommendation to screen everyone in this age group. For men 70 and older, the Task Force recommends against routine PSA screening, as the risks of overdiagnosis tend to outweigh the benefits at that age.
For men at higher risk, including Black men and those with a family history of prostate cancer, the conversation may need to start earlier. These groups face a higher likelihood of developing prostate cancer and dying from it. The Task Force acknowledges this increased risk but stops short of setting a specific screening age, instead encouraging early, informed discussions with a doctor.
The Tradeoff: Early Detection vs. Overdiagnosis
Screening can catch aggressive cancers before they spread, which may lower the chance of dying from the disease. For some men, simply knowing their status provides peace of mind. But screening also finds slow-growing cancers that would never have caused symptoms or shortened a person’s life. This is called overdiagnosis, and it’s the central tension in prostate screening.
Men diagnosed with these slow-growing cancers often face a difficult choice: treat a cancer that may never have harmed them (and deal with potential side effects like urinary problems or sexual dysfunction), or monitor it closely and accept the uncertainty. False positives are also common, particularly in older men. An elevated PSA that turns out to be benign can still lead to anxiety, additional testing, and an unnecessary biopsy.
This is why guidelines emphasize shared decision-making rather than automatic screening. The “right” choice depends on your age, risk factors, family history, and how you personally weigh the possibility of early detection against the chance of unnecessary treatment.