Your doctor checks for swollen lymph nodes, including in your neck, underarm and groin, as well as for a swollen spleen or liver.
Blood and urine tests may help rule out an infection or other disease.
 Your doctor may recommend imaging tests to look for signs of lymphoma cells elsewhere in your body. Tests may include CT, MRI and positron emission tomography (PET).
Your doctor may recommend a lymph node biopsy procedure to remove all or part of a lymph node for laboratory testing. Analyzing lymph node tissue in a lab may reveal whether you have non-Hodgkin’s lymphoma and, if so, which type.
A bone marrow biopsy and aspiration procedure involve inserting a needle into your hipbone to remove a sample of bone marrow. The sample is analyzed to look for non-Hodgkin’s lymphoma cells.
If there’s a concern that the lymphoma may affect the fluid around your spinal cord, your doctor might recommend a procedure to remove some of the fluid for testing. During a spinal tap, the doctor inserts a small needle into the spinal canal in your lower back.
