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Nonmalignant disorders of lymphocytes
1Department of Pathology, University of Utah School of Medicine, Salt Lake City 84132, USA. Karen_Brown@medschool.med.utah.edu
Insights
Nonmalignant lymphocyte disorders involve changes in lymphocyte counts, such as lymphocytosis or lymphocytopenia. Laboratory findings are crucial for identifying the cause of these immune system variations.
Area of Science:
- Immunology
- Hematology
- Clinical Pathology
Background:
- Lymphocytes play a critical role in immune responses.
- Nonmalignant disorders of lymphocytes encompass quantitative and qualitative variations.
- Understanding these disorders is essential for diagnosing various health conditions.
Purpose of the Study:
- To review the etiology, pathophysiology, clinical features, and laboratory findings of nonmalignant lymphocyte disorders.
- To highlight the significance of laboratory assessment in diagnosing these conditions.
Main Methods:
- Review of current literature.
- Author determination of study selection and data extraction.
Main Results:
- Quantitative disorders include increased (lymphocytosis) or decreased (lymphocytopenia) lymphocyte counts.
- Common causes of lymphocytosis include infectious mononucleosis and cytomegalovirus.
- Lymphocytopenia can result from stress, therapy, nutrient deficiencies, or acquired immunodeficiency syndrome.
- Clinical and laboratory findings aid in determining the etiology of lymphocyte disorders.
Conclusions:
- Nonmalignant lymphocyte disorders present as benign quantitative or qualitative variations.
- Reactive lymphocytosis often indicates viral or bacterial infections.
- The clinical laboratory is vital for distinguishing reactive lymphocytosis from malignant processes.
- Benign lymphocytopenia requires laboratory characterization.
Objective:
To review the etiology, pathophysiology, clinical features, and laboratory findings in nonmalignant disorders of lymphocytes.
Data Sources:
Current literature.
Study Selection:
Determined by author.
Data Extraction:
Determined by author.
Data Synthesis:
Assessing qualitative and quantitative changes in lymphocytes provides important information regarding immune reactions, disease conditions, and responses to therapy. Quantitative nonmalignant disorders encompass those conditions in which the total number of lymphocytes may be either increased (lymphocytosis) or decreased (lymphocytopenia). Frequently encountered disorders with a lymphocytosis include infectious mononucleosis and cytomegalovirus infection. Lymphocytopenia is not detected as often or as easily in the clinical laboratory, but may be induced by several causes such as stress, certain types of therapy, nutrient deficiencies, or premature destruction of lymphocytes as occurs in acquired immunodeficiency syndrome. Clinical and laboratory findings provide significant clues in defining the etiology of a nonmalignant disorder of lymphocytes.
Conclusion:
Disorders of lymphocytes include both benign and malignant quantitative and qualitative variations. A reactive lymphocytosis is commonly associated with many viral and certain bacterial infections. The clinical laboratory plays an important role in differentiating reactive and malignant lymphoproliferative processes. Benign lymphocytopenia, although not a frequent finding, must also be characterized by the laboratory.