Lymphocytes - Normal, High, Low

The reference range of lymphocytes is:

Conventional Units

Percent (mean)   34%
Absolute count (per microliter): 1000-4800

SI Units

Mean number fraction:  0.34
Absolute count X 109 per liter:  1.0-4.8

A low value(lymphocytopenia) may indicate:

  • Autoimmune disorders (e.g., lupus, rheumatoid arthritis)
  • Infections (e.g., HIV, viral hepatitis, typhoid fever, influenza)
  • Bone marrow damage (e.g., chemotherapy, radiation therapy)
  • Corticosteroids

A high value(lymphocytosis) may indicate:

  • Acute viral infections (e.g., chicken pox, cytomegalovirus (CMV), Epstein-Barr virus (EBV), herpes, rubella)
  • Certain bacterial infections (e.g., pertussis (whooping cough), tuberculosis (TB))
  • Toxoplasmosis
  • Chronic inflammatory disorder (e.g., ulcerative colitis)
  • Lymphocytic leukemia, lymphoma
  • Stress (acute)


* The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.