In short
If kidney cancer is possible, a GP arranges urine tests and refers you for imaging. CT of the kidneys is the usual way a mass is characterised. MRI is used if CT is not suitable. A biopsy is not always required before an operation. Blood tests check kidney function. This is general information, not a personal diagnosis.
Visible blood in the urine in adults often triggers a two-week-wait urology referral in the NHS. The scan is what finds a kidney mass.
What scans are used?
CT urogram or a dedicated kidney CT shows size, enhancement and whether the cancer has grown into veins or nearby organs. Chest imaging looks for spread.
When is a biopsy done?
If the plan is to watch a small mass, or if surgery would be high risk, a needle biopsy can confirm the type. Many people go straight to surgery when imaging is typical.
Help a patient afford cancer care
Gifts go to the Cancer Emergency Appeal’s wider fund for patients who cannot pay. They do not buy a guaranteed treatment or result.
Donate to cancer careWhat about cystoscopy?
If blood in the urine might be coming from the bladder, a camera test of the bladder is often added. Kidney and bladder pathways overlap on that symptom.
Key takeaways
- CT is the main diagnostic scan for a kidney mass.
- A biopsy is not always needed before surgery.
- Blood in the urine can also need a bladder check.
Care like this is out of reach for millions
The diagnosis, screening and treatment described here are routine in the UK. In Pakistan, Indonesia and Malaysia, poverty can put them out of reach. The Cancer Emergency Appeal raises funds towards clinically recommended care for patients who cannot pay; gifts go to the wider fund and do not buy a guaranteed treatment or result.
Frequently asked questions
Will I need contrast dye?
Often yes, unless kidney function or allergy makes it unsafe. The radiology team explains the plan.
Can ultrasound diagnose kidney cancer?
It can find a mass. CT or MRI usually characterises it.
Does WAN run scans in the UK?
No. We fund overseas treatment bills.
Editorial summary of published sources. A named oncology clinician has not signed off this guide. Use it to prepare questions for your healthcare team, not to diagnose symptoms or choose treatment. Editorial responsibility: Kaiser Khan. Updated 4 October 2026.
What are the sources for this guide?
Follow the original guidance for its evidence, dates and limitations. General background references are not a clinical review of this page.