Introduction: Who Should Seek Diagnostic Testing

If you notice blood in your urine, even if it happens just once and doesn’t hurt, you should speak with a doctor without delay. This symptom, known as hematuria (which simply means blood in the urine), is the most common warning sign of bladder cancer and appears in about 85 to 90 percent of people who have this disease.^[14] The blood might be visible to the naked eye, making your urine look pink, red, or cola-colored, or it might only show up under a microscope during routine testing.^[1]

Adults who are 35 years old or older and notice blood in their urine should undergo diagnostic evaluation with specific tests including cystoscopy, kidney function tests, and imaging of the upper urinary tract.^[9] This age guideline exists because bladder cancer typically affects older adults, with most people diagnosed around age 73, and about 90 percent of cases occurring in people over 55.^[9][13] However, younger people should also be evaluated if they have blood in their urine along with other concerning symptoms.

Beyond visible blood, other symptoms warrant medical attention and diagnostic testing. These include frequent urination, painful urination, or back pain.^[1] Sometimes people experience what doctors call irritative voiding symptoms—a feeling of needing to urinate urgently or more often than usual—particularly when high-grade tumors are present.^[14] If you have any combination of these symptoms, especially if they persist or worsen, seeking medical evaluation is important.

People with certain risk factors should be especially vigilant about symptoms and may benefit from earlier or more frequent evaluation. Cigarette smoking is the strongest risk factor for bladder cancer and is thought to cause about half of all cases.^[9][14] Men are three to four times more likely than women to develop the disease, though women often have more advanced disease at diagnosis because they may not be aware of the symptoms.^[2][9] Other risk factors include working in chemical or textile industries, prior pelvic radiation treatment, use of certain medications like cyclophosphamide, and chronic bladder infections or irritation.^[9][13][14]

Classic Diagnostic Methods

Once you see a doctor about concerning symptoms, several diagnostic tests help determine whether cancer is present and, if so, what type and how far it has spread. The diagnostic process typically involves multiple steps, each providing different pieces of information that together create a complete picture.

Cystoscopy: Looking Inside the Bladder

The most important test for diagnosing bladder cancer is called cystoscopy, which allows doctors to look directly inside your bladder. This procedure should be performed in all patients with visible blood in their urine, all patients 35 years and older who have microscopic blood in their urine, and all patients with symptomatic microscopic hematuria regardless of age.^[9] During a cystoscopy, the doctor inserts a thin tube with a tiny camera on the end through your urethra (the tube that carries urine out of your body) and into your bladder.^[7]

This visual examination lets the doctor see the inside lining of your bladder and identify any abnormal growths, tumors, or areas that look suspicious. If anything unusual is found, the doctor can take small tissue samples called biopsies during the same procedure. Sometimes doctors use a special technique called blue light cystoscopy, which involves putting a light-sensitive drug into the bladder before the exam. Under blue light, cancer cells glow differently than normal cells, making them easier to spot.^[2]

Transurethral Resection of Bladder Tumor (TURBT)

If cystoscopy reveals a tumor, the next step is usually a procedure called transurethral resection of the bladder tumor, often shortened to TURBT. This procedure serves three purposes at once: it provides tissue for definitive diagnosis, helps determine the stage of the cancer (how deeply it has grown into the bladder wall), and serves as the primary treatment for many bladder cancers.^[9]

During TURBT, the surgeon uses a special instrument inserted through the urethra to cut away the tumor along with some surrounding normal tissue. This tissue is then examined under a microscope by a specialist called a pathologist, who can identify the exact type of cancer cells, determine whether they are low-grade or high-grade (how aggressive they look), and see how deeply the tumor has grown into the layers of the bladder wall.^[7][10]

Imaging Tests: Seeing the Bigger Picture

Because cancer can develop anywhere along the urinary tract, imaging tests that create pictures of your kidneys, ureters (tubes connecting kidneys to bladder), and bladder are an essential part of the initial evaluation. These tests help doctors look for tumors in areas that cystoscopy cannot reach.^[9]

The preferred imaging test is computed tomography urography, also called a CT urogram. This is a special type of CT scan that focuses on the urinary system. Before the scan, you receive an injection of contrast dye that travels through your bloodstream to your kidneys and urinary tract, making these structures show up more clearly on the images.^[9] The scan creates detailed cross-sectional pictures that can reveal tumors, blockages, or other abnormalities throughout your urinary system.

Other imaging tests may be used depending on your situation. A regular CT scan of your abdomen and pelvis can show whether cancer has spread beyond the bladder to nearby lymph nodes or other organs. Magnetic resonance imaging (MRI) may be used in some cases to get more detailed pictures of the bladder and surrounding tissues. For checking whether cancer has spread to bones or other distant sites, doctors might order a bone scan or other specialized imaging.^[7]

Urine Tests

Several urine tests can provide helpful information, though they are not used alone to diagnose bladder cancer. Urine cytology involves examining urine under a microscope to look for cancer cells. This test is particularly good at detecting high-grade tumors and a type of flat cancer called carcinoma in situ, with sensitivity greater than 90 percent for these aggressive cancers.^[9] However, urine cytology and other urine tumor marker tests should not be performed routinely for initial evaluation because they can miss lower-grade cancers and are best used in patients with a high likelihood of disease.^[9]

A standard urinalysis checks for blood, infection, or other abnormalities in your urine. While finding blood in urine is an important warning sign, the absence of blood doesn’t rule out cancer, and the presence of blood doesn’t confirm it—many other conditions can cause hematuria.^[3]

Blood Tests and Kidney Function

Blood tests help assess your overall health and kidney function, which is important for treatment planning. Tests that measure creatinine and other markers show how well your kidneys are working. These are particularly important because treatment decisions may depend on kidney function, and bladder cancer can sometimes affect how well the kidneys drain urine if tumors block the ureters.^[9]

Determining Grade and Stage

After tissue is obtained through TURBT, pathologists examine it carefully to determine two crucial characteristics: grade and stage. The grade describes how abnormal the cancer cells look under a microscope. Bladder cancers are generally classified as either low-grade or high-grade. Low-grade cancers have cells that look more like normal bladder cells and tend to grow slowly. High-grade cancers have cells that look very abnormal and tend to grow and spread more aggressively.^[7][10]

The stage describes how deeply the cancer has grown into the bladder wall and whether it has spread beyond the bladder. Doctors divide bladder cancer into several categories based on stage. Non-invasive cancer is only in the innermost lining of the bladder. Non-muscle-invasive cancer has grown into deeper layers but hasn’t reached the thick muscle layer of the bladder wall. Muscle-invasive cancer has grown into or through the muscle layer and sometimes into surrounding fatty tissue or nearby organs.^[2][5]

Most bladder cancers—about 90 percent—are a type called urothelial carcinoma (also known as transitional cell carcinoma), which starts in the cells that line the inside of the bladder.^[3][4] Other less common types include squamous cell carcinoma, adenocarcinoma, and small cell carcinoma. Some urothelial cancers have variant features with different types of cells mixed in, which typically makes them more aggressive.^[7][10]

Diagnostics for Clinical Trial Qualification

Clinical trials test new treatments for bladder cancer and other urinary tract cancers, but they have specific requirements about who can participate. These requirements help ensure that the trial can accurately measure whether a new treatment works and is safe. The diagnostic tests and criteria used to determine eligibility for clinical trials are often more detailed and standardized than those used in routine clinical care.

Confirming Diagnosis and Disease Characteristics

Before you can enroll in a bladder cancer clinical trial, doctors need clear confirmation of your diagnosis through tissue examination. This means you must have had a biopsy or TURBT that proves you have bladder cancer, along with a pathology report that describes the type of cancer cells and their grade. The pathology may need to be reviewed by the trial’s designated experts to confirm the diagnosis meets the trial’s criteria.

Clinical trials typically specify exactly what types and stages of bladder cancer they are studying. For example, a trial might only accept patients with non-muscle-invasive high-grade disease, or it might focus on muscle-invasive cancer that hasn’t spread to distant organs. Some trials target specific subtypes, such as urothelial carcinoma with certain variant features. Your medical records and test results must clearly document that your cancer fits these specifications.^[7][10]

Staging and Extent of Disease

Accurate staging is crucial for clinical trial eligibility. Trials need to know precisely how far your cancer has spread, so you’ll need complete staging workup including imaging studies. This typically includes CT scans of your chest, abdomen, and pelvis to check whether cancer has spread to lymph nodes or other organs. Some trials may require MRI scans for more detailed assessment of the bladder and surrounding tissues, or PET scans to look for cancer throughout the body.^[7]

The staging must be documented according to standardized systems that doctors around the world use. For bladder cancer, this is usually the TNM system, where T describes the depth of tumor growth into the bladder wall, N indicates whether cancer is in lymph nodes, and M shows whether it has spread to distant sites.^[11] Your staging results need to match what the clinical trial is studying.

Baseline Function Tests

Clinical trials carefully monitor how treatments affect your body, so they need baseline measurements of your health before treatment starts. Blood tests checking kidney function are especially important for bladder cancer trials because many treatments affect the kidneys or are processed through them. Tests measuring creatinine levels and calculating glomerular filtration rate (how well kidneys filter blood) help determine whether your kidneys can handle the trial treatment.^[9][11]

Liver function tests, complete blood counts, and other standard blood work establish baseline values for comparison. If the trial involves chemotherapy or other drugs that can affect specific organs, you may need additional tests like echocardiograms to check heart function or pulmonary function tests to assess lung capacity.

Performance Status and Overall Health

Trials assess your overall health and ability to carry out daily activities using standardized scales called performance status measures. The most common are the Eastern Cooperative Oncology Group (ECOG) scale and the Karnofsky Performance Status scale. These ratings help ensure trial participants are healthy enough to tolerate the treatment being studied and that results can be compared across different groups of patients.

Your doctor will also review your complete medical history and current medications to identify any conditions or treatments that might interfere with the trial or make participation unsafe. Some trials exclude people with certain other health conditions or those who have received specific prior treatments.

Molecular and Genetic Testing

Some modern clinical trials, especially those testing targeted therapies or immunotherapies, require specific molecular or genetic tests on your tumor tissue. These tests look for particular characteristics of cancer cells that might predict whether a treatment will work. For example, some trials test whether your tumor has certain genetic mutations or whether it produces specific proteins on its surface that a targeted drug can attack.^[8]

Testing might also include analysis of how many immune cells are present in and around your tumor, or whether your tumor has certain features that suggest it will respond to immunotherapy. These specialized tests are performed on tissue samples obtained during your biopsy or TURBT and may take several weeks to complete.

Quality of Life and Symptom Assessments

Many clinical trials systematically measure quality of life and specific symptoms before and during treatment. Before enrolling, you may be asked to complete detailed questionnaires about urinary symptoms, pain levels, emotional well-being, and how cancer and its symptoms affect your daily life. These baseline assessments help researchers understand how treatments affect not just survival but also patients’ day-to-day experience and overall well-being.

Documentation Requirements

Clinical trials require thorough documentation of all diagnostic test results. This means copies of pathology reports, imaging reports, laboratory test results, and medical records must be available for review by the research team. Some trials have independent radiology or pathology review, where experts working with the trial examine your scans or tissue samples themselves to confirm the findings meet trial criteria.

The timeline of your tests matters too. Most trials require that certain tests be performed within a specific window before enrollment—for example, staging scans might need to be done within 4 to 6 weeks of starting treatment. If your diagnostic tests are too old, you may need to repeat them to participate in a trial.