A prostate biopsy is the only way to confirm or exclude prostate cancer. Understanding what the report means — Gleason grade, cores involved, tumour volume — determines what happens next.
Your urologist has recommended a prostate biopsy. Perhaps your PSA is elevated, or the MRI scan showed a suspicious area. The word "biopsy" is alarming for most patients — it signals that cancer is being seriously considered. Understanding what the procedure involves, and how to read the results, removes much of the fear associated with it.
1. Why a biopsy is recommended
A prostate biopsy is recommended when the combination of PSA, clinical examination, and mpMRI suggests a meaningful risk of clinically significant prostate cancer. It is the only way to obtain tissue — and tissue is the only definitive way to diagnose or exclude cancer.
The decision to biopsy is not taken lightly. A urologist will weigh the PSA level, PSA density, PSA velocity, MRI findings (PIRADS score), digital rectal examination, age, and overall health before recommending biopsy. A PIRADS 4 or 5 lesion on MRI with elevated PSA density is a strong indication. A PIRADS 1–2 MRI may allow deferral with close monitoring.
2. Types of prostate biopsy
Transrectal Ultrasound-guided. Needle passes through rectal wall. Systematic cores from 12 zones. Higher infection risk due to rectal route.
Needle passes through skin of perineum — between scrotum and rectum. Significantly lower infection risk. Better access to anterior prostate. Now the preferred route.
MRI-targeted versus systematic biopsy
Modern prostate biopsy should be MRI-informed. If an mpMRI identified a suspicious lesion, targeted biopsies of that specific area are taken in addition to the systematic samples. This is called MRI/ultrasound fusion biopsy — software overlays the MRI onto the real-time ultrasound image to guide the needle precisely to the suspicious zone.
Anterior tumours — in the front of the prostate — are routinely missed by traditional systematic TRUS biopsy. MRI-targeted transperineal biopsy detects these tumours and reduces false-negative results. It is the standard of care at specialist centres.
3. What the procedure involves
A transperineal prostate biopsy is performed under local anaesthetic (office-based) or short general/spinal anaesthetic. Here is what to expect:
Preparation
A bowel preparation enema is not required for the transperineal route. Antibiotics are given before the procedure. A urine flow test and residual check may be done at the same visit.
Positioning and anaesthesia
You lie in the lithotomy position (legs in supports). Local anaesthetic is injected into the perineal skin and the space around the prostate (periprostatic nerve block). This adequately numbs the area for most patients.
Ultrasound probe and biopsy
A small ultrasound probe is placed in the rectum (internally, you feel pressure but no pain). Biopsy needles are passed through the perineal skin using a template grid. Typically 12–20 cores are taken, including targeted samples if an MRI lesion was identified.
After the procedure
You will see some blood in the urine and semen for 2–4 weeks — this is expected and not alarming. Some bruising in the perineum is normal. Most men can return to light activities the following day.
If you develop a fever above 38°C, rigors (uncontrolled shivering), difficulty passing urine, or heavy bright red bleeding after biopsy — attend the emergency department immediately. Infection after biopsy, though uncommon with the transperineal route, requires prompt antibiotic treatment.
4. Reading your biopsy report
Results are typically available within 7–10 working days. The pathology report contains several key pieces of information:
Gleason score and Grade Group
The Gleason score describes how abnormal the cancer cells look under the microscope — and how likely the cancer is to grow and spread. It is expressed as two numbers added together (e.g., 3+4=7), representing the most common and second most common patterns seen. Modern reporting uses Grade Groups (1–5) which map directly to Gleason scores.
Other key report elements
- Number of cores positive: How many of the biopsy needles found cancer (e.g., 4 of 12 cores positive).
- Percentage involvement per core: How much of each core contains cancer (e.g., 60% of core). High involvement suggests greater tumour volume.
- Perineural invasion: Cancer cells found along nerve fibres — suggests more aggressive behaviour.
- Location: Which zones of the prostate are involved — left, right, anterior, posterior. This informs nerve-sparing decisions in surgery.
5. If cancer is found
A positive biopsy is the beginning of a conversation — not the end of one. The grade, extent, and location determine the treatment options. The next steps typically include staging (CT and bone scan, or PSMA PET, to check for spread) and a multidisciplinary discussion of treatment options: active surveillance, robotic surgery, or radiation.
Except in high-risk disease, prostate cancer does not require decisions made within days. Take time to understand your options, seek a second opinion if needed, and ask about all available treatments before deciding.
6. If cancer is not found
A negative biopsy is reassuring but does not guarantee the complete absence of cancer — it means no cancer was found in the cores taken. If the MRI showed a suspicious lesion and the biopsy was negative, close follow-up with repeat PSA and possible repeat biopsy may be recommended.
A negative biopsy with a normal or low-suspicion MRI is genuinely reassuring, and PSA monitoring alone may be appropriate going forward. Your urologist will advise on the appropriate follow-up interval.
- Will my biopsy be MRI-targeted — or systematic only?
- Is it transperineal or transrectal — and why?
- How many cores will be taken, and from which zones?
- If cancer is found — what staging investigations will I need?
- What does my Gleason grade mean for my treatment options?
- If no cancer is found — what follow-up will I need?
This article is for general patient education only. Prostate biopsy recommendations, technique, and result interpretation require individual assessment by a qualified urologist. Do not make decisions based on this article alone.