Testicular cancer is typically diagnosed through a combination of physical examination, scrotal ultrasound, blood tests for tumor markers, and surgical removal of the affected testicle. Unlike most cancers, a needle biopsy is not used. Instead, the testicle itself is removed through a groin incision, and that tissue provides the definitive diagnosis. The process usually moves quickly from the first sign of a lump to a clear answer.
What Happens During the Physical Exam
Most cases begin when a person notices a lump, swelling, or hardening in one testicle. Sometimes there’s pain, but often there isn’t. During the exam, a doctor feels both testicles for any lumps, changes in size or firmness, and tenderness. They also check the abdomen, groin, and lymph nodes for signs that cancer may have spread beyond the testicle.
Several non-cancerous conditions can cause scrotal swelling or lumps, including fluid buildup around the testicle, cysts, and infections of the tube behind the testicle (epididymitis). These need to be ruled out before cancer is suspected. If an alternative diagnosis can’t be confirmed, the next step is imaging.
Ultrasound: The First Imaging Step
A scrotal ultrasound with Doppler is the standard imaging test when a suspicious mass is found. It’s painless, takes about 15 to 20 minutes, and uses sound waves to create a detailed picture of the tissue inside the scrotum.
On ultrasound, testicular tumors typically appear as well-defined, darker masses compared to the surrounding normal tissue. They may also show internal calcification or small cystic areas. The Doppler component measures blood flow to the area, though increased blood flow alone isn’t enough to confirm cancer. What the ultrasound does well is distinguish between a solid mass inside the testicle (which raises concern for cancer) and a fluid-filled cyst or a problem outside the testicle (which usually doesn’t). If the ultrasound shows a mass suspicious for malignancy, the diagnostic path moves to blood work and surgery.
Blood Tests for Tumor Markers
Before any surgery, doctors draw blood to measure three proteins that testicular cancers often produce in abnormal amounts. These tumor markers help with diagnosis, guide treatment decisions, and serve as a baseline for monitoring after treatment.
- Alpha-fetoprotein (AFP): Normal levels are below 10 micrograms per liter. An elevated AFP points specifically to a non-seminoma type of testicular cancer, since pure seminomas do not produce this protein. If AFP is elevated, the tumor has a non-seminoma component regardless of what it looks like under a microscope.
- Human chorionic gonadotropin (HCG): Normal levels are below 5 IU per liter. Both seminomas and non-seminomas can produce HCG. Levels above 5,000 IU/L usually indicate a non-seminoma, and higher levels are associated with a worse prognosis.
- Lactate dehydrogenase (LDH): Normal levels are generally below 250 U per liter. LDH is less specific to testicular cancer than the other two markers, but elevated levels correlate with a larger overall tumor burden in seminomas and with recurrence risk in non-seminomas.
Not all testicular cancers produce elevated markers. Some tumors, particularly pure seminomas, may show normal AFP and only mildly elevated or normal HCG. So normal blood work does not rule out cancer. These markers are most useful when they are elevated, because they provide strong clues about the cancer type and help doctors track response to treatment later on.
Radical Inguinal Orchiectomy: The Definitive Diagnosis
Testicular cancer is not diagnosed with a needle biopsy. The concern is that piercing the testicle through the scrotum could allow cancer cells to spread into surrounding tissues or alter the natural drainage pattern of the tumor. Instead, the entire testicle is removed through a small incision in the groin. This procedure is called a radical inguinal orchiectomy, and it serves as both the primary treatment and the way to get a definitive diagnosis.
The surgery is performed under general anesthesia and typically takes under an hour. The surgeon accesses the testicle by cutting through the groin rather than the scrotum, which allows the spermatic cord (the bundle of vessels and tubes connecting the testicle to the body) to be clamped early, reducing any risk of cancer cells entering the bloodstream during the procedure. Recovery takes one to two weeks for most people, with restrictions on heavy lifting for several weeks afterward.
Once removed, the testicle goes to a pathologist who examines it under a microscope. This is where the specific cancer type is identified. The two broad categories are seminoma and non-seminoma, and the distinction matters because treatment approaches differ. The pathologist also determines how deeply the tumor has invaded surrounding structures, which directly feeds into staging.
How Testicular Cancer Is Staged
Staging determines how far the cancer has spread and shapes the entire treatment plan. Testicular cancer uses the TNM system, which evaluates three things: the primary tumor (T), nearby lymph nodes (N), and whether cancer has spread to distant sites (M). Tumor marker levels after surgery also factor into the final stage grouping, which is unique to testicular cancer compared to most other cancers.
For the primary tumor, staging ranges from T1 (cancer confined to the testicle without invading blood or lymph vessels) through T4 (cancer that has grown into the scrotum). The key dividing line is whether the tumor has invaded the blood or lymph vessels, because that significantly increases the risk of spread even when the cancer appears localized.
Lymph node involvement is assessed primarily through CT scans of the abdomen and pelvis, since testicular cancer spreads first to lymph nodes along the back of the abdominal cavity. Nodes are classified by size: N1 means nodes 2 centimeters or smaller, N2 means nodes between 2 and 5 centimeters, and N3 means nodes larger than 5 centimeters. A chest CT or X-ray checks for spread to the lungs, the most common distant site.
What Staging Means for Prognosis
Testicular cancer has one of the highest cure rates of any cancer, but prognosis varies by stage and type. An international classification system groups metastatic cases into good, intermediate, and poor prognosis categories based on where the cancer started, where it has spread, and tumor marker levels.
For non-seminomas in the good prognosis group (AFP below 1,000, HCG below 5,000, LDH less than 1.5 times the upper limit of normal, no spread beyond the lungs), the five-year survival rate is 96%. Seminomas fare similarly, with 95% five-year survival in the good prognosis group. Even in the poor prognosis category for non-seminomas, which includes very high marker levels or spread to organs other than the lungs, the five-year survival rate is still 67%. Seminomas are never classified as poor prognosis.
The Typical Diagnostic Timeline
From the moment you notice a lump to a confirmed diagnosis, the process often moves within a few weeks. A doctor’s visit leads to an ultrasound, usually scheduled within days. If the ultrasound shows a suspicious solid mass, blood is drawn for tumor markers, and surgery is typically scheduled within one to two weeks. Pathology results come back within about a week after surgery, at which point you know the exact type and stage of the cancer. Staging scans (CT of the abdomen, pelvis, and chest) are often completed before or shortly after surgery.
The speed of this process reflects how treatable testicular cancer is when caught early. Most cases are diagnosed at an early stage, and the combination of physical exam, ultrasound, blood markers, and surgical pathology provides a highly reliable diagnostic picture with relatively few ambiguous results.