From PSA Test to Diagnosis: The MRI-Before-Biopsy Pathway Explained

Medically reviewed by Mr Maneesh Ghei, Consultant Urological Surgeon (GMC: 5208045)

A prostate MRI scan now sits between PSA testing and any biopsy in the modern UK pathway, and that single change has reshaped how prostate cancer is diagnosed over the last decade. Multiparametric MRI (mpMRI) lets your urologist see suspicious areas inside the prostate before deciding whether a biopsy is needed at all. It reduces unnecessary biopsies, improves the accuracy of those that are performed and gives you a clearer picture of what is happening before you make any treatment decisions.

This is the pathway Jeremy Clarkson described in his June 2026 prostate cancer announcement on Clarkson’s Farm. PSA blood test, then MRI, then targeted biopsy, then treatment. It is the pathway every patient at Urocare London follows.

Why The Pathway Changed

Until around 2015, men with a raised PSA usually went straight to biopsy. The standard technique took 10 to 12 random samples from across the prostate and relied on chance to hit any cancer present. It missed clinically significant cancers in roughly a fifth of cases and picked up clinically insignificant low-grade disease that may never have needed treatment.

The PROMIS trial published in 2017, followed by the PRECISION trial in 2018, changed everything. Both showed that performing a multiparametric MRI before deciding on biopsy:

• Reduced the number of biopsies needed by around 25 to 30%
• Increased the detection rate of clinically significant cancers by around 18%
• Reduced overdiagnosis of low-grade cancers that did not need treatment

NICE updated its guidance in 2019. NHS England rolled the pathway out across the country. Today the MRI-before-biopsy approach is standard of care in every NHS trust and every private clinic with a consultant urologist worth seeing. It is what NICE recommends and what BAUS expects.

What Is A Multiparametric MRI Scan?

Multiparametric MRI, or mpMRI, is a specialised MRI scan of the prostate that combines three different imaging techniques in one appointment:

1. T2-weighted imaging. Shows the anatomy of the prostate in detail. Highlights zonal structure and the prostate capsule
2. Diffusion-weighted imaging (DWI). Detects restricted water movement in cancerous tissue, which behaves differently to normal tissue
3. Dynamic contrast-enhanced imaging. A small dose of contrast dye is given through a vein, showing how blood flows through the prostate. Cancers tend to take up contrast faster and lose it faster than benign tissue

Together these three sequences let a specialist uroradiologist build a picture of the prostate, identify any suspicious areas and grade them. The scan itself takes around 30 to 45 minutes. You lie still on your back inside the MRI scanner – there is no pain or prep apart from avoiding food / drink for a few hours prior.

What Is PI-RADS Scoring?

The Prostate Imaging Reporting and Data System, or PI-RADS, is a standardised scoring system that grades how suspicious any lesion looks on mpMRI. The radiologist assigns a score from 1 to 5 to each suspicious area identified:

This is why MRI before biopsy matters so much. If your PSA is raised but your MRI shows PI-RADS 1 or 2 lesions, you usually avoid biopsy entirely. You move to active monitoring instead. If the MRI shows PI-RADS 4 or 5, the biopsy that follows is targeted directly at the suspicious area rather than guessing where to sample.

What A Targeted Biopsy Involves

If MRI flags a suspicious area, the next step is a targeted prostate biopsy. There are two routes:

• Transperineal biopsy. Now the preferred route in modern UK practice. Needles pass through the perineum (the skin between the scrotum and anus) under local or general anaesthetic. Lower infection rate than the older route
• Transrectal biopsy (TRUS). The older route, through the rectal wall under local anaesthetic. Still used but now less common because of higher infection risk

Modern biopsies use software that fuses the MRI images with real-time ultrasound, allowing the urologist to direct the biopsy needle precisely at the MRI-flagged area. The procedure typically takes 20 to 30 minutes. Most men go home the same day and return to normal activity within 24 to 48 hours.

Gleason Score Explained

If the biopsy finds cancer, the tissue is sent to a pathologist who assigns a Gleason score. The pathologist examines the cells under a microscope and grades the two most common patterns, each from 3 to 5 (grades 1 and 2 are rarely reported in modern practice). The two numbers are added together to give a total Gleason score and a Grade Group from 1 to 5.

The order of the two numbers matters. A 3+4 cancer has mostly Grade 3 cells with some Grade 4. A 4+3 cancer has mostly Grade 4 cells with some Grade 3. The 4+3 is treated more aggressively even though both have the same total of 7.

Jeremy Clarkson described his cancer as aggressive but caught really early, and said it was still contained within the prostate when diagnosed. He has not publicly disclosed a specific Gleason score or Grade Group. An aggressive cancer caught while still inside the prostate capsule has very high cure rates with treatment.

What Happens After Diagnosis?

If a cancer is confirmed, the next step is staging. This determines whether the cancer is still contained within the prostate capsule or has spread to surrounding tissue, lymph nodes or distant organs. Staging uses a combination of:

• The MRI results already in hand
• A bone scan or PET-CT scan in higher-risk cases
• Blood tests including PSA velocity and the free-to-total PSA ratio

Treatment decisions are then based on grade, stage, age, general health and personal preference. Options include:

• Active surveillance for low-risk disease that may not need treatment
• Radical prostatectomy, surgical removal of the prostate, often performed robotically
• External beam radiotherapy, often combined with hormone therapy for intermediate or high risk
• Brachytherapy, radioactive seeds implanted in the prostate
• Focal therapy, treating only the cancerous portion of the gland in selected cases

Each option has different side effect profiles around urinary continence, erectile function and bowel symptoms. Your urologist will explain each in detail before any decision is made.

How Long Does The Private Pathway Take?

From first phone call to having a treatment decision in hand, the typical private timeline at Urocare London is:

• Day 1. Phone or online booking
• Within 7 days. Initial consultation with Mr Ghei. PSA blood test taken at the same visit
• Day 10 to 12. PSA result reviewed with Mr Ghei by phone
• Days 14 to 21. Multiparametric MRI scan performed if PSA result needs further investigation
• Days 21 to 28. MRI result reviewed. Targeted biopsy planned if PI-RADS 3, 4 or 5
• Days 28 to 35. Biopsy performed. Tissue sent for pathology
• Days 35 to 42. Pathology result, Gleason score, staging and treatment discussion

The equivalent NHS pathway can take 4 to 6 months and sometimes even longer.

Frequently Asked Questions

What is a prostate MRI scan?

A prostate MRI scan, specifically a multiparametric MRI (mpMRI), is a specialised imaging test that combines three different MRI sequences to produce detailed pictures of the prostate. It identifies suspicious areas before any biopsy is considered. The scan takes around 30 to 45 minutes, is painless and involves no preparation beyond avoiding food and drink for a few hours.

What does PI-RADS mean on a prostate MRI report?

PI-RADS stands for Prostate Imaging Reporting and Data System. It is a standardised scoring system from 1 to 5 that grades how suspicious any lesion looks on multiparametric MRI. PI-RADS 1 or 2 usually means no biopsy needed. PI-RADS 3 is borderline. PI-RADS 4 or 5 means a targeted biopsy is recommended.

Do I need a prostate biopsy if my MRI is clear?

In most cases, no. If your multiparametric MRI scores PI-RADS 1 or 2, the likelihood of clinically significant cancer is very low and most urologists will recommend continuing PSA monitoring rather than proceeding to biopsy. The negative predictive value of modern mpMRI is over 90%.

How much does a private prostate MRI scan cost in London?

A private multiparametric prostate MRI at Urocare London starts from £737. The full PSA-to-MRI pathway, including consultation and PSA test, totals around £1,033 if MRI is needed. Most major UK health insurers cover the cost when clinically indicated.

What is a Gleason score?

The Gleason score grades the appearance of prostate cancer cells under the microscope. The pathologist scores the two most common cell patterns each from 3 to 5 and adds them together. Scores range from 6 to 10, with higher numbers indicating more aggressive cancer. Modern reporting now uses Grade Groups from 1 to 5 alongside the Gleason score.

How long does the private prostate cancer pathway take?

The full pathway at Urocare London, from first booking to treatment discussion, typically takes 4 to 6 weeks. The equivalent NHS pathway often takes 3 to 6 months. Same-week consultation, MRI within 1 to 2 weeks if needed, and biopsy and pathology within 3 to 4 weeks total.

Is a targeted biopsy more accurate than a random biopsy?

Yes. A targeted biopsy guided by mpMRI directs the needle at the specific area the MRI identified as suspicious. The PRECISION trial showed targeted biopsy detects around 18% more clinically significant cancers than the older systematic random biopsy approach, while reducing detection of clinically insignificant low-grade disease.

About the Author

Mr Maneesh Ghei, Consultant Urological Surgeon (GMC: 5208045)

Mr Maneesh Ghei is a consultant urological surgeon with NHS and private practice across four London hospitals. He specialises in the diagnosis and management of prostate conditions including BPH, prostatitis and prostate cancer, as well as urinary symptoms, kidney stones and male sexual health. Mr Ghei sees new patients privately with same-week availability. Both self-funded and insured patients are welcome. No GP referral is required. Book a prostate screening consultation.