Red Flags in Primary Care: When to Refer for Suspected Urological Cancer
The urological cancers most likely to present through general practice — prostate, kidney and bladder — are often detectable at a stage where treatment options are meaningful. The referrals that matter most are the ones where a GP recognises a red flag early and moves on it.
This guide focuses on the cancer-relevant triggers that warrant urological assessment, what to include, and when to move urgently.
Haematuria
Visible haematuria warrants urological assessment. A single episode is enough. The absence of pain does not reduce concern — painless macroscopic haematuria is a classic presentation of bladder cancer.
Anticoagulation and other potential explanations should not delay evaluation. Patients on anticoagulants can and do harbour underlying malignancy, and haematuria in this context still needs to be properly assessed rather than attributed.
Recurrence of haematuria after treatment of a UTI should also prompt referral. A UTI may coexist with an underlying lesion.
For microscopic haematuria, persistent findings on two or more occasions without an identified benign cause — particularly in patients over 40, smokers, or those with occupational exposure to aromatic amines — warrant assessment. The risk is lower than with macroscopic haematuria, but it is not zero.
What to include: MSU results, renal function, any imaging already performed, medication list including anticoagulants, smoking history and occupational history.
Elevated or rising PSA
PSA interpretation requires context — but a rising PSA or one above the age-adjusted threshold is not something to watch indefinitely without a plan.
Referral is appropriate when:
PSA is elevated above the age-adjusted threshold without a clear benign explanation
PSA is rising on serial testing, even if still within the normal range
PSA velocity is rapid (a rise of more than 0.75 ng/mL per year in older men warrants attention; lower thresholds apply in younger men)
There is an abnormal DRE finding regardless of PSA level
The patient has a significant family history — first-degree relative with prostate cancer, particularly early-onset — and is approaching screening age
Where possible, send a PSA trend rather than a single value. A PSA of 4.2 that has risen from 1.8 over two years tells a different story to a PSA of 4.2 that has been stable for five.
Note that 5-alpha reductase inhibitors (finasteride, dutasteride) approximately halve PSA values. If a patient is taking these medications, the reported PSA should be interpreted accordingly — a value that appears normal may represent a significantly higher true level.
What to include: PSA history with dates, DRE findings, current medications, family history, urinary symptoms.
Incidental renal mass
Incidental renal masses are found with increasing frequency as CT and ultrasound become more common in general practice. The key questions are enhancement, size and imaging characteristics.
Any enhancing renal mass on CT warrants urological review. Enhancement indicates vascularity and significantly raises the probability of renal cell carcinoma.
For cystic lesions, Bosniak classification guides urgency. Bosniak I and II lesions are generally low risk and can be monitored; Bosniak IIF, III and IV warrant specialist input. If a radiology report does not classify a cystic lesion, it is reasonable to request clarification or refer.
For solid masses, size is relevant but not the only determinant. Small renal masses under four centimetres may be candidates for active surveillance rather than immediate surgery — but that decision benefits from specialist assessment, particularly where patient age and comorbidities are relevant.
What to include: CT or ultrasound report and images, renal function, relevant comorbidities, smoking history.
Testicular mass
Any solid, painless testicular mass should be referred promptly for ultrasound and urological assessment. Testicular cancer predominantly affects younger men and is highly treatable when caught early — delay has real consequences.
Acute scrotal pain where torsion cannot be confidently excluded requires emergency assessment, not a routine referral.
Unexplained hydronephrosis or ureteric obstruction
New unilateral hydronephrosis found incidentally — particularly without an obvious cause such as a known stone — warrants investigation. Ureteric obstruction from an undetected transitional cell carcinoma of the ureter or renal pelvis is an important diagnosis not to miss, and one that can be clinically silent until relatively advanced.
If the obstruction is associated with infection, this becomes urgent.
When to move quickly
These presentations warrant urgent or semi-urgent referral rather than routine:
Macroscopic haematuria with clots, or haematuria causing retention
Rapidly rising PSA or a level significantly above the age-adjusted threshold
Renal mass with systemic symptoms — weight loss, constitutional features
Ureteric obstruction with associated infection (this is an emergency)
Solid testicular mass in a young man
New unexplained hydronephrosis
When in doubt, call the rooms. A brief conversation about triage is always welcome.
What makes a referral easy to act on quickly
The referrals I find easiest to triage are the ones that include:
The specific clinical concern and relevant history
PSA trend with dates — not just the most recent value
Imaging reports and where possible the images themselves
Relevant pathology (MSU, renal function)
Current medications including anticoagulants and 5-alpha reductase inhibitors
Any urgency flags clearly stated
A referral that says "haematuria — please review" is workable but slow. A referral that says "65-year-old, two episodes macroscopic haematuria, non-smoker, USS bladder normal, no UTI, PSA 2.1" allows same-day triage and a faster appointment.
A note on my practice
My practice focuses on urological cancer surgery and complex urological conditions, with a particular focus on robotic prostate, kidney and bladder cancer surgery. I am happy to discuss cases prior to referral where the picture is unclear, or where you are unsure whether a finding warrants specialist input.
For urgent referrals — confirmed or strongly suspected cancer, rapidly rising PSA, symptomatic obstruction — contact the rooms directly and we will prioritise accordingly.
Referral details, clinic locations and contact information are on the For Physicians page. Further information on specific cancers and procedures is available on the Prostate Cancer, Kidney Cancer and Bladder Cancer pages.
Clinical note: This article is intended for healthcare professionals and reflects general referral principles. Individual clinical decisions should be based on the full clinical picture and local guidelines.
Last reviewed: May 2026
About the author: Dr Deanne Soares is a Melbourne-based urologist with a subspecialist focus in robotic prostate, kidney and bladder cancer surgery.
