Lymph Node Enlargement Evaluation and Referral

Initial Assessment and Referral Criteria

Patients with lymph node characteristics such as size (nodes >1.5 cm in long axis or >1.0 cm in short axis), consistency (hard or matted nodes), and distribution across multiple anatomical regions should be referred to hematology-oncology for evaluation of potential lymphoma or systemic malignancy, with consideration for surgical consultation if excisional biopsy is needed for definitive diagnosis, as recommended by the American College of Physicians 1, 2
The presence of B symptoms, such as fever, night sweats, or unintentional weight loss, strongly suggests lymphoma and necessitates expedited referral with PET-CT imaging, according to the American Society of Clinical Oncology 1, 3
A history of immunosuppression, such as HIV status, organ transplantation, or immunosuppressive therapy, significantly alters the differential diagnosis toward post-transplant lymphoproliferative disorders, as noted by the Infectious Diseases Society of America 1, 3

The American College of Radiology recommends CT chest/abdomen/pelvis for comprehensive nodal and extranodal assessment in patients with suspected lymphoma 1
Laboratory studies, including complete blood count with differential, comprehensive metabolic panel including LDH, and β2-microglobulin, should be obtained before or concurrent with referral to expedite diagnosis, as suggested by the College of American Pathologists 1
The American Society for Clinical Pathology recommends that excisional biopsy remains the gold standard for definitive diagnosis of lymphoma, as it preserves nodal architecture necessary for accurate classification 1

The hematology-oncology team will coordinate multidisciplinary evaluation, including pathology review, flow cytometry, immunohistochemistry, and molecular studies necessary for lymphoma classification, as recommended by the American Society of Hematology 4, 1
The College of American Pathologists suggests that if excisional biopsy is required, fresh tissue should be sent in saline (not formalin) for flow cytometry and additional studies 5