Prostate biopsy reports

Transrectal vs Transperineal — How the Route Changes Your Results

The route used to take your prostate biopsy affects what was sampled and your risk of infection afterwards. Understanding which route was used helps you ask the right questions about what was found — and what may not have been looked at.

Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026

Route affects detection — Transperineal sampling reaches the front of the prostate that transrectal approaches frequently miss.
Sepsis risk differs — Transrectal biopsies carry a higher risk of serious infection because the needle passes through the bowel wall.
Gleason scoring stays the same — How your Gleason score is calculated does not change with the route — the grading system is identical either way.
A negative result is not always final — A transrectal biopsy that finds nothing does not rule out cancer in areas the route cannot reliably reach.

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The route used for your biopsy affects both what was sampled and your risk of infection. Transperineal biopsies reach the anterior part of the prostate that transrectal sampling frequently misses. Transperineal also carries a lower risk of sepsis. Which route was used does not change how your Gleason score is calculated.

Does the biopsy route change what the report shows?

Yes, in two ways: what was sampled, and how safely it was sampled.

The prostate has a front portion, called the anterior zone, that is difficult to reach when the needle enters through the rectum. Transrectal biopsies can miss cancers that sit in this area. Transperineal biopsies, where the needle enters through the skin between the scrotum and the anus, reach the anterior zone more reliably.

The Gleason grading system itself does not change. If cancer is found in a core, it is graded the same way regardless of which route the urologist used. What the route changes is the likelihood that all significant areas were sampled in the first place.

What to check on your prostate biopsy report

Which route was used — transrectal or transperineal — and whether MRI was used to guide any cores
How many cores were taken in total, and from which zones of the prostate
How many cores came back positive, and whether any zone was not sampled
The Gleason grade given for each positive core, not just the overall combined grade
Whether any core shows perineural invasion or high-grade PIN — your urologist will explain what these mean for your situation
The percentage of each positive core that contained cancer — your urologist uses this alongside the grade

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Terms you will see on a prostate biopsy report

Transrectal (TRUS) biopsy: The needle enters through the wall of the rectum. It has been the standard approach for decades, but carries a higher post-procedure infection risk and has limited reach into the anterior zone.
Transperineal biopsy: The needle enters through the skin of the perineum — the area between the scrotum and the anus. It avoids the bowel wall entirely, reducing sepsis risk, and gives better access to the front of the prostate.
Anterior zone: The front portion of the prostate. Cancers here are more likely to be missed on a transrectal approach, and this is the main reason a transperineal or MRI-targeted repeat biopsy is sometimes recommended after a negative result.
Systematic biopsy: Cores taken from a mapped grid of positions across the prostate. It samples a representative spread rather than a specific lesion, and is often done alongside targeted cores.
Targeted biopsy: Cores taken specifically from a lesion identified on MRI before the procedure. Often done alongside systematic cores so both suspicious and unsuspected areas are sampled.
Core: A single thin cylinder of tissue taken by the needle. A standard biopsy takes multiple cores from different parts of the prostate. Each is examined and reported separately.
Positive core: A core that contains cancer cells. The report states how many of the cores taken were positive, and gives the Gleason grade for each.
Perineural invasion: Cancer cells seen growing along a nerve sheath in the biopsy sample. Your urologist will explain what this finding means in the context of your full report.

Did you know?

The European Association of Urology notes that transperineal biopsy is associated with a substantially lower rate of serious post-procedure infection than the transrectal route, because the needle does not pass through the bowel wall.

This has made transperineal the preferred approach at many centres, particularly for repeat biopsies after a previous negative result.

Source: EAU Guidelines on Prostate Cancer, European Association of Urology

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Common questions

Frequently asked questions

Does the biopsy route change my Gleason score?

No. The Gleason grading system is applied the same way regardless of whether the cores were taken transrectally or transperineally. What changes between routes is the coverage — which parts of the prostate were actually sampled. The route affects whether a cancer was found at all, not how it is graded once it is found. If you have questions about what your Gleason grade means, that conversation belongs with your urologist who knows your full case.

Which route is better at finding anterior tumours?

Transperineal biopsy has better access to the anterior zone — the front portion of the prostate — because the needle approaches from below rather than through the rectum. Anterior tumours are one of the main reasons a repeat biopsy is sometimes recommended after a transrectal biopsy comes back negative, particularly when an MRI scan has identified a suspicious area at the front of the gland that may not have been reliably sampled the first time.

How much greater is the infection risk with transrectal biopsy?

The transrectal route passes through the bowel wall, which carries bacteria. EAU guidance acknowledges this as a meaningful difference between the two approaches, with transperineal carrying a lower risk of serious post-procedure infection, including sepsis. The exact risk varies by centre and antibiotic protocol. If your biopsy was transrectal, your team would have given you antibiotics beforehand. If you develop a fever, chills, or feel unwell in the days after any biopsy, contact your team or go to a hospital the same day — do not wait.

If my transrectal biopsy was negative, do I need a transperineal one?

That depends on your PSA level, your MRI findings, and your urologist's assessment. A negative transrectal biopsy does not conclusively rule out cancer in the anterior zone. If your MRI showed a suspicious lesion in an area that may not have been well sampled, or if your PSA continues to rise, your urologist may recommend a transperineal or MRI-targeted biopsy as a next step. This is a clinical decision that requires your full history — ask your urologist directly.

What does 'MRI-targeted' mean on my report?

It means that some or all of the cores were taken from a specific area identified as suspicious on an MRI scan done before the biopsy. MRI-targeted cores are usually taken alongside systematic cores, which sample a broader grid. Your report may list targeted and systematic cores separately with their individual Gleason grades. MRI guidance can be used with either a transrectal or transperineal approach, and does not change how the cores are graded.

What should I ask my urologist about the route used?

Ask which zones were sampled and whether any area of the prostate was not covered. If your result is negative, ask whether the route used gives reliable access to all parts of your prostate — particularly the anterior zone — and whether your MRI identified any area that may need targeted sampling. Ask also how many cores were taken and from where. These questions help you understand what the biopsy can and cannot tell you, before any decisions are made about next steps.

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