High-grade B-cell lymphoma requires specialized testing to confirm the diagnosis and determine the best treatment approach. Understanding what tests are needed and when to seek medical attention can help patients and their families navigate this challenging time.

Introduction: When to Seek Diagnostic Testing

If you notice certain warning signs in your body, it may be time to talk to your doctor about diagnostic tests. High-grade B-cell lymphoma can develop quickly, so recognizing symptoms early matters. People who experience persistent swollen lymph nodes, especially in the neck, underarms, or groin area, should consider getting evaluated. These swollen areas may feel like firm lumps under the skin and don’t go away after a few weeks.^[2]

Other symptoms that suggest you should seek diagnostic testing include drenching night sweats that soak through your clothes and bedding, unexplained tiredness that doesn’t improve with rest, and pain in your belly that persists. Some people also notice an enlarged spleen or liver, though these changes might not cause obvious symptoms at first. If you develop any combination of these signs, especially if they last for more than two weeks, it’s important to schedule an appointment with your healthcare provider.^[2][11]

Not everyone with high-grade B-cell lymphoma experiences symptoms right away. Sometimes, this condition is discovered during routine tests or examinations for unrelated health issues. This is why regular check-ups can be valuable, particularly if you have risk factors that might increase your chances of developing lymphoma.^[2]

Diagnostic Methods for High-Grade B-Cell Lymphoma

Diagnosing high-grade B-cell lymphoma involves several different types of tests and procedures. Each test provides specific information that helps doctors understand what’s happening in your body and confirm whether lymphoma is present.

Physical Examination

The diagnostic process often starts with a thorough physical exam. Your doctor will check for swollen lymph nodes by gently feeling areas of your neck, underarms, and groin. They’ll also examine your abdomen to see if your spleen or liver feels larger than normal. During this exam, your doctor will ask about your symptoms, when they started, and whether anything makes them better or worse.^[13]

Blood Tests

Blood tests play an important role in the diagnostic process, though they cannot diagnose high-grade B-cell lymphoma on their own. These tests can sometimes show whether lymphoma cells are present in your bloodstream. Doctors also use blood tests to check for certain viruses that might be connected to lymphoma, including Epstein-Barr virus (a common virus that causes infectious mononucleosis), HIV (human immunodeficiency virus), and hepatitis C virus.^[13]

Another important blood test measures levels of lactate dehydrogenase, often called LDH. This substance is frequently found at higher levels in people with lymphoma. When LDH levels are elevated, it can provide doctors with additional evidence that lymphoma might be present and help them understand how active the disease is.^[13]

Imaging Tests

Imaging tests create detailed pictures of the inside of your body, allowing doctors to see where lymphoma is located and how far it has spread. Several types of imaging may be used during the diagnostic process.^[13]

Computed tomography, commonly known as a CT scan, uses X-rays and computer technology to create cross-sectional images of your body. This test can show enlarged lymph nodes and whether lymphoma has affected organs like your liver, spleen, or other tissues.^[13]

Magnetic resonance imaging, or MRI, uses powerful magnets and radio waves to create detailed pictures of soft tissues in your body. MRI scans are particularly useful for examining certain areas and can provide different information than CT scans.^[13]

Positron emission tomography, called a PET scan, involves injecting a small amount of radioactive sugar into your bloodstream. Cancer cells, which use more energy than normal cells, absorb more of this sugar and show up as bright spots on the scan. PET scans help doctors determine the extent of lymphoma throughout your body.^[13]

Biopsy: The Definitive Test

A biopsy is the most important test for diagnosing high-grade B-cell lymphoma. This procedure involves removing a sample of tissue so it can be examined under a microscope in a laboratory. Without a biopsy, doctors cannot definitively confirm whether you have lymphoma or determine what type it is.^[13]

For lymphoma diagnosis, doctors usually perform a lymph node biopsy. This means removing all or part of a swollen lymph node. In some cases, depending on your symptoms and where abnormalities appear on imaging tests, a biopsy may be taken from other areas of your body.^[13]

Once the tissue sample reaches the laboratory, specialists examine it to look for cancer cells. They perform various tests on the sample to understand the characteristics of any abnormal cells they find. This information is crucial because high-grade B-cell lymphoma has specific features that distinguish it from other types of lymphoma.^[13]

Molecular and Genetic Testing

For high-grade B-cell lymphoma specifically, doctors need to perform specialized molecular tests on the biopsy sample. These tests look for specific changes in the genes within the lymphoma cells. High-grade B-cell lymphoma is characterized by rearrangements, which means parts of genes have switched places within the chromosomes (the structures that contain genetic information).^[1]

The diagnosis of high-grade B-cell lymphoma requires finding rearrangements in particular genes. One rearrangement must involve the MYC gene, and another must involve either the BCL2 gene or the BCL6 gene. When both of these gene changes are present, the condition used to be called “double-hit lymphoma.” If rearrangements are found in all three genes (MYC, BCL2, and BCL6), it was called “triple-hit lymphoma.” Today, both types are classified as high-grade B-cell lymphoma.^[1][14]

These molecular tests are performed by examining the chromosomes under a microscope using special techniques. The presence of these specific gene rearrangements is what allows doctors to confirm a diagnosis of high-grade B-cell lymphoma and distinguish it from other similar types of lymphoma, such as diffuse large B-cell lymphoma (DLBCL) without gene rearrangements or Burkitt lymphoma without these particular changes.^[1]

Bone Marrow Testing

Bone marrow aspiration and biopsy are procedures used to collect cells from your bone marrow, which is the soft, spongy tissue inside your bones where blood cells are made. Bone marrow testing has two parts: aspiration involves using a needle to collect a sample of the liquid portion of bone marrow, while biopsy uses a needle to remove a small amount of the solid tissue. Most often, these samples are taken from your hip bone.^[13]

The samples are sent to a laboratory for testing. In high-grade B-cell lymphoma, bone marrow testing helps doctors determine whether lymphoma cells have spread to the bone marrow. This information is important for understanding the extent of the disease and planning treatment.^[13]

Diagnostics for Clinical Trial Qualification

If you’re considering participating in a clinical trial for high-grade B-cell lymphoma, you’ll need to undergo specific tests to determine whether you qualify. Clinical trials have strict eligibility criteria that help researchers ensure the study will provide reliable results and that participants are likely to be safe during the trial.

The standard tests used for clinical trial qualification typically include all the diagnostic tests mentioned earlier: physical examination, blood tests, imaging studies, biopsy with molecular testing, and bone marrow evaluation. However, clinical trials may require additional or more frequent testing than what’s typically done in standard care.^[1]

Many clinical trials require confirmation that you have the specific type of lymphoma being studied. For high-grade B-cell lymphoma trials, this means your biopsy must show the characteristic gene rearrangements involving MYC and either BCL2 or BCL6. The molecular tests that identify these genetic changes must be performed at a qualified laboratory, and the results must be clearly documented.^[1]

Clinical trials often have specific requirements about the stage of your disease. You may need recent imaging tests, typically within a few weeks before enrolling in the trial, to document exactly where lymphoma is present in your body. These baseline images will later be compared to new images taken during and after treatment to measure how well the experimental therapy is working.

Blood tests are particularly important for trial qualification. Researchers need to know that your organs are functioning well enough to handle the experimental treatment. Tests of your kidney function, liver function, and blood cell counts are usually required. If these values fall outside certain ranges, you might not be eligible for a particular trial because the treatment could be unsafe for you.

Some clinical trials have specific requirements about previous treatments. You might need documentation showing what treatments you’ve already received, how your lymphoma responded, and when those treatments were given. This information helps researchers understand whether the experimental therapy being tested is appropriate for your situation.

Your overall health status, called performance status, is another factor that clinical trials evaluate. Doctors use standardized scales to assess how well you can perform daily activities. This assessment helps determine whether you’re strong enough to tolerate the experimental treatment and participate fully in the study.

For high-grade B-cell lymphoma specifically, clinical trials may require testing to check whether lymphoma has spread to your central nervous system (brain and spinal cord). This might involve imaging of your brain or a lumbar puncture (also called a spinal tap), where a small amount of fluid is collected from around your spinal cord and tested for lymphoma cells. High-grade B-cell lymphoma has a higher risk of spreading to the central nervous system compared to some other lymphomas, so this testing helps researchers understand the full extent of your disease.^[9]