Understanding how Non-Hodgkin’s lymphoma is diagnosed involves learning about physical examinations, imaging tests, biopsies, and other procedures that help doctors identify this group of blood cancers and determine the best approach to care.

Introduction

Non-Hodgkin’s lymphoma is a group of blood cancers that develop in the lymphatic system, which is part of your body’s defense against infections and disease. The lymphatic system includes lymph nodes, spleen, thymus, bone marrow, and other organs that work together to protect you from germs. When doctors suspect someone might have Non-Hodgkin’s lymphoma, they use several different diagnostic methods to confirm the presence of cancer and understand its characteristics.^[1]

People who should consider seeking diagnostic evaluation include those who notice painless swelling in their neck, armpits, or groin that persists for several weeks. This swelling indicates enlarged lymph nodes in these areas. Other warning signs include persistent tiredness that doesn’t improve with rest, unexplained fevers, night sweats so intense they soak your sheets, and unintentional weight loss where you lose about ten percent of your body weight over six months without trying.^[1]

It’s important to understand that many common conditions can cause these same symptoms. Having one or more of these signs doesn’t necessarily mean you have Non-Hodgkin’s lymphoma. However, it’s advisable to contact a healthcare provider anytime you notice changes in your body that last for several weeks, especially if symptoms worsen or new ones appear.^[3]

Healthcare providers pay special attention to what are called B symptoms, which include fever, night sweats, and unexplained weight loss. These symptoms help doctors classify the type and severity of Non-Hodgkin’s lymphoma. Additional symptoms depend on where the lymphoma cells are located in the body. For example, if the cancer affects the chest area, you might experience chest pain, coughing, or trouble breathing. If it affects the abdomen, you might feel belly pain, swelling, or feel full even when you haven’t eaten much.^[1]

About two-thirds of patients with Non-Hodgkin’s lymphoma present with swollen lymph nodes when they first see a doctor. Less common ways the disease shows itself include skin rashes, increased sensitivity to insect bites, generalized fatigue, itching all over the body, unexplained fevers, or fluid buildup in the abdomen or around the lungs. Some people may have no symptoms at all and discover they have lymphoma only during routine medical examinations or tests done for other reasons.^[2]

Diagnostic Methods

Physical Examination

The diagnostic process typically begins with a thorough physical examination. During this exam, a healthcare professional checks for swollen lymph nodes in your neck, underarms, and groin by gently feeling these areas. The doctor also examines your abdomen to check whether your spleen or liver is enlarged, as these organs can become swollen when affected by lymphoma. This hands-on examination provides important clues about whether further testing is needed.^[12]

The physical exam is non-invasive and painless. Your doctor will ask about your symptoms, how long you’ve had them, and whether they’ve changed over time. They’ll also ask about your medical history, including any previous illnesses, treatments you’ve received, and whether anyone in your family has had cancer or immune system problems.^[3]

Blood and Urine Tests

Blood tests and urine tests are routine diagnostic procedures used to help rule out infections or other diseases that might explain your symptoms. These laboratory tests can provide valuable information about your overall health and how well your organs are functioning. While blood tests alone cannot definitively diagnose Non-Hodgkin’s lymphoma, they can reveal abnormalities that suggest the presence of cancer or other conditions.^[12]

During a blood test, a small sample of blood is drawn from a vein in your arm. The blood is then analyzed in a laboratory to check various components, including blood cell counts, liver and kidney function, and levels of certain proteins. These results help doctors understand whether your body is showing signs of disease and guide them in deciding what additional tests might be needed.^[1]

Imaging Tests

Imaging tests create detailed pictures of the inside of your body, allowing doctors to look for lymphoma cells in different organs and tissues. Several types of imaging tests may be used to diagnose Non-Hodgkin’s lymphoma and determine how far it has spread throughout the body.^[12]

Computed Tomography (CT) scans use X-rays taken from multiple angles to create cross-sectional images of your body. These detailed pictures help doctors see swollen lymph nodes, enlarged organs, and other abnormalities that might indicate lymphoma. CT scans are particularly useful for examining the chest, abdomen, and pelvis.^[3]

Magnetic Resonance Imaging (MRI) scans use powerful magnets and radio waves instead of radiation to create detailed images of soft tissues in your body. MRI scans are especially helpful for looking at certain areas like the brain, spinal cord, and bone marrow. The procedure involves lying still inside a large tube-shaped machine for about thirty to sixty minutes.^[3]

Positron Emission Tomography (PET) scans involve injecting a small amount of radioactive sugar into your bloodstream. Cancer cells, which use sugar for energy more rapidly than normal cells, show up as bright spots on the scan. PET scans are particularly useful for determining whether lymphoma has spread to other parts of the body and for evaluating how well treatment is working.^[12]

X-rays may also be used, particularly chest X-rays, to look for swollen lymph nodes or other abnormalities in the chest area. While X-rays provide less detail than CT or MRI scans, they are quick, widely available, and useful for initial evaluation.^[2]

Lymph Node Biopsy

A biopsy is the most definitive way to diagnose Non-Hodgkin’s lymphoma. This procedure involves removing a sample of tissue from a swollen lymph node or other affected area and examining it under a microscope in a laboratory. The biopsy allows doctors to determine whether cancer cells are present and, if so, what specific type of Non-Hodgkin’s lymphoma you have.^[12]

There are different types of lymph node biopsies. An excisional biopsy removes an entire lymph node through a small incision. This is often preferred because it provides the most tissue for analysis. A needle biopsy uses a needle to remove a smaller sample of tissue and can often be done in a doctor’s office with local anesthesia. The type of biopsy performed depends on which lymph nodes are enlarged and where they’re located in your body.^[12]

Once the tissue sample is obtained, specialized laboratory tests examine the cells to look for specific characteristics. These tests can identify the type of lymphocyte involved, whether it’s a B-cell or T-cell lymphoma, and whether the lymphoma is aggressive or indolent. This detailed information is crucial for determining the most appropriate treatment approach.^[1]

Bone Marrow Tests

Bone marrow testing involves collecting samples of bone marrow to check whether lymphoma cells have spread to the bone marrow. The bone marrow is the soft, spongy tissue inside larger bones where new blood cells are made. Two procedures are typically performed together: bone marrow aspiration and bone marrow biopsy.^[12]

During bone marrow aspiration, a needle is used to withdraw a sample of the liquid portion of the bone marrow. A bone marrow biopsy uses a larger needle to remove a small core of bone and marrow. Both samples are usually taken from the back of the hip bone. The procedure is done with local anesthesia to minimize discomfort, though you may feel pressure and a brief, sharp pain when the samples are taken.^[12]

The bone marrow samples are examined in a laboratory to look for lymphoma cells. Finding cancer cells in the bone marrow indicates that the disease has spread beyond the lymph nodes, which affects both the stage of the cancer and the treatment plan. Bone marrow testing provides essential information about the extent of the disease throughout your body.^[2]

Diagnostics for Clinical Trial Qualification

When patients are being considered for enrollment in clinical trials, additional diagnostic tests and procedures may be required beyond those used for standard diagnosis. Clinical trials often have specific entry criteria that must be met, and comprehensive testing ensures that participants are appropriate candidates for the experimental treatments being studied.^[4]

The staging of Non-Hodgkin’s lymphoma is particularly important for clinical trial qualification. Staging describes how much cancer is in the body and where it’s located. Many clinical trials are designed for patients at specific stages of disease, whether early stage or advanced stage. Staging involves combining information from physical examinations, imaging tests, biopsies, and bone marrow tests to create a complete picture of the disease.^[4]

Clinical trials may require documentation of the specific subtype of Non-Hodgkin’s lymphoma through detailed pathology reports from biopsies. Some trials focus on particular subtypes, such as diffuse large B-cell lymphoma or follicular lymphoma, and participants must have confirmed diagnoses of these specific types. Laboratory tests examine the cancer cells for specific genetic changes, protein markers, or chromosomal abnormalities that may indicate whether a patient is likely to respond to a particular experimental treatment.^[1]

Blood tests measuring organ function are commonly required for clinical trial participation. These tests ensure that a patient’s liver, kidneys, heart, and bone marrow are healthy enough to tolerate experimental treatments. Trials may specify acceptable ranges for blood cell counts, liver enzymes, kidney function tests, and other laboratory values. Patients whose organs aren’t functioning within the required ranges may not be eligible for certain trials because the treatments could pose too great a risk.^[2]

Imaging tests such as CT scans, PET scans, or MRI scans are typically required at the beginning of a clinical trial to establish a baseline measurement of the cancer. These baseline scans document the size and location of all tumors before treatment begins. Throughout the trial, repeat scans at scheduled intervals allow researchers to measure how the cancer responds to the experimental treatment. This standardized approach to measuring treatment response is essential for determining whether new therapies are effective.^[4]

Some clinical trials require specialized tests that aren’t part of routine diagnosis. For example, trials testing targeted therapies may require genetic testing of the cancer cells to look for specific mutations that the treatment is designed to target. Trials evaluating immunotherapies may require analysis of proteins on the surface of cancer cells or tests measuring immune system function. These specialized tests help researchers select patients who are most likely to benefit from experimental treatments.^[4]

Documentation of previous treatments is another critical component of clinical trial qualification. Many trials are designed specifically for patients whose lymphoma has returned after initial treatment or who haven’t responded to standard therapies. Detailed records of all previous medications, radiation therapy, surgeries, and other treatments must be provided. Some trials exclude patients who have received certain types of therapy, while others specifically require prior treatment history.^[4]

Performance status assessment is commonly used in clinical trials to evaluate a patient’s overall health and ability to perform daily activities. Healthcare providers use standardized scales to rate whether patients are fully active, capable of light work, or require significant assistance with self-care. Clinical trials often specify minimum performance status requirements because patients who are very weak or ill may not be able to safely participate in studies involving intensive treatments.^[2]