Reactive Lymphocytes
Reactive or atypical lymphocytes are enlarged, activated T cells responding to viral infection or other antigenic stimulation. They are classically seen in infectious mononucleosis (EBV) and also appear with CMV, viral hepatitis, HIV seroconversion, toxoplasmosis, and drug reactions. Quantity and morphology help guide further workup.
1 providers include this
Complete Blood Count (CBC)
0-3% of WBC
What is Reactive Lymphocytes?
Reactive or atypical lymphocytes are enlarged, activated T cells responding to viral infection or other antigenic stimulation. They are classically seen in infectious mononucleosis (EBV) and also appear with CMV, viral hepatitis, HIV seroconversion, toxoplasmosis, and drug reactions. Quantity and morphology help guide further workup.
Why It Matters
Often elevated in viral infections like mononucleosis (EBV), CMV, hepatitis, and other viral illnesses. These activated immune cells indicate the body is mounting an immune response to infection.
Which Providers Test Reactive Lymphocytes?
Full Provider Comparison
| Provider | Includes | Annual Cost | Biomarkers |
|---|---|---|---|
 Superpower | — | $199 | 100+ (150 with ratios) |
 WHOOP Advanced Labs | — | $349 | 65 |
 Labcorp OnDemand | — | $398 | 40+ |
| — | $486 | 40+ | |
| — | $449 | 288 | |
| — | $349 | 100+ | |
| — | $829 | 54 | |
 Function Health | — | $365 | 160+ |
| — | $250 | 65 | |
| — | $495 | 80+ | |
| — | $895 | 100+ | |
| — | $1950 | 130+ | |
| — | $375 | 95+ | |
| — | $Varies | 75+ | |
| ✓ | $190 | 100+ | |
| — | $99 | 50 | |
| — | $124 | 60 | |
| — | $349 | 130+ | |
| — | $349 | 80+ | |
| — | $375 | 85 | |
| — | $700 | 128 | |
| — | $99 | 100+ |
Frequently Asked Questions
What is Reactive Lymphocytes?
Reactive or atypical lymphocytes are enlarged, activated T cells responding to viral infection or other antigenic stimulation. They are classically seen in infectious mononucleosis (EBV) and also appear with CMV, viral hepatitis, HIV seroconversion, toxoplasmosis, and drug reactions. Quantity and morphology help guide further workup.
What is the optimal range for Reactive Lymphocytes?
The standard reference range for Reactive Lymphocytes is 0-3% of WBC. Optimal ranges may differ based on individual health goals and expert recommendations.
Which blood test providers include Reactive Lymphocytes?
1 out of 22 blood testing providers include Reactive Lymphocytes in their panels. This biomarker has limited availability.
What category does Reactive Lymphocytes fall under?
Reactive Lymphocytes is categorized under Complete Blood Count (CBC). This category includes biomarkers that help assess related aspects of health and wellness.
Medical Disclaimer
This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider about your specific health needs.
Last reviewed:2026-04-12