How Is Prostate Cancer Diagnosed?

Hearing that your PSA is elevated or being told you need additional testing can be stressful. Many men wonder what comes next and whether cancer is actually present.

If you’re asking, “How is prostate cancer diagnosed?” the process usually begins with screening tests such as PSA blood work and may include imaging and a biopsy. While screening can identify signs that something may be wrong, a biopsy is the only way to confirm prostate cancer.

What Tests Are Used to Diagnose Prostate Cancer?

For many men, the process starts with prostate cancer screening. Screening tests can help identify signs that something may be wrong, but they can’t confirm whether cancer is present.

PSA Blood Test

PSA stands for prostate-specific antigen, a protein made by the prostate gland. Small amounts of PSA normally circulate in the blood. Higher levels can sometimes indicate a problem.

An elevated PSA doesn’t automatically mean you have prostate cancer. PSA levels can also rise because of:

Benign prostatic hyperplasia (BPH)
Prostate inflammation
Infection
Recent ejaculation
Normal age-related changes

In many cases, doctors begin investigating further when PSA levels reach about 4 ng/mL. But your age, symptoms, family history, and PSA trend may lead to earlier testing.

Digital Rectal Exam (DRE)

A PSA test is often paired with a digital rectal exam (DRE). During this brief exam, your doctor inserts a gloved finger into the rectum to feel the prostate.

The goal is to check for:

Firm areas
Lumps or nodules
Irregular shapes or textures

An abnormal PSA test or DRE doesn’t diagnose cancer, but it may indicate the need for additional testing.

What Happens After an Abnormal PSA Test?

If screening results raise concerns, your doctor will review your medical history, symptoms, and risk factors.

You may be asked about:

Changes in urinary frequency
Weak urine flow
Urgency
Blood in the urine or semen
Pelvic discomfort
Erectile dysfunction (ED)
Family history of prostate cancer

This information helps your doctor determine which tests should come next.

Is MRI Used to Diagnose Prostate Cancer?

Many urologists recommend imaging before moving forward with a biopsy.

What Is a Multiparametric MRI (mpMRI)?

A multiparametric MRI uses several imaging methods to create detailed images of the prostate and nearby tissue.

It helps doctors evaluate:

Whether suspicious areas are present
How concerning an abnormal area appears
Whether cancer may have spread beyond the prostate

An mpMRI can’t diagnose prostate cancer by itself. However, it can help identify which areas may need closer evaluation and may sometimes help avoid an unnecessary biopsy.

What Is Transrectal Ultrasound (TRUS)?

Transrectal ultrasound uses sound waves to create real-time images of the prostate.

During the procedure, a small probe is placed into the rectum. Ultrasound can help:

Measure the prostate
Identify suspicious areas
Guide needle placement during a biopsy

How Is Prostate Cancer Confirmed?

A prostate biopsy is the only way to definitively diagnose prostate cancer.

PSA tests, physical exams, and imaging studies can identify areas of concern. However, only a biopsy can confirm whether cancer cells are present.

During a biopsy, your urologist removes small tissue samples from the prostate using a thin needle. A pathologist then examines those samples under a microscope.

Most biopsies collect about 12 tissue samples from different parts of the prostate.

The procedure is usually performed on an outpatient basis using local anesthesia.

Two common approaches include:

Transrectal biopsy, where the needle passes through the rectal wall
Transperineal biopsy, where the needle passes through the skin between the scrotum and anus

What Is an MRI Fusion Biopsy?

If an MRI identifies a suspicious area, your doctor may recommend an MRI fusion biopsy.

This technique combines MRI images with real-time ultrasound images during the procedure. By matching the two image sets together, your urologist can target suspicious areas more precisely.

MRI fusion biopsy can improve accuracy, especially when evaluating higher-risk lesions.

Are Additional Prostate Cancer Tests Sometimes Needed?

In some cases, your doctor may recommend additional testing.

These tests may use blood, urine, or previously collected tissue samples to provide more information about your cancer risk.

Genetic testing may also be recommended if you:

Have a strong family history of prostate cancer
Carry a known inherited mutation, such as BRCA
Develop prostate cancer at a younger age
Have a more aggressive form of the disease

What Happens After a Prostate Cancer Diagnosis?

Not all prostate cancers behave the same way.

After a diagnosis, your doctor will determine the cancer’s grade and stage.

Grade describes how abnormal the cancer cells look under a microscope. Doctors often use the Gleason score or Grade Group system. Lower-grade cancers usually grow more slowly. Higher-grade cancers are more likely to grow and spread.

Stage describes how far the cancer has spread. It shows whether the cancer is still inside the prostate or has reached nearby tissue, lymph nodes, or other parts of the body.

These details help your doctor recommend the treatment plan that’s most appropriate for your situation.