Lymphocytes
Lymphocytes include B cells that make antibodies, T cells that coordinate adaptive immunity, and natural killer cells that target virus-infected and tumor cells. Elevated counts occur with viral infection, chronic inflammation, or lymphocytic leukemia; low counts appear in HIV, steroid therapy, chemotherapy, and severe stress responses.
Optimal range: who says what
No institution or named practitioner we track states an optimal target for Lymphocytes. How we verify ranges.
- General guidance, no named sourceWithin referenceNo separate optimal established
- Published reference interval20-40% (1000-4000/μL)Medscape
- Lab reference interval20-40% or 1.0-4.0 x10^9/LWhat a lab report flags against. A lab interval is not an optimal target.
20 of 21 itemized panels
Complete Blood Count (CBC)
Why Lymphocytes matters
Critical for adaptive immunity. Low in HIV, immunosuppression. High in viral infections, leukemia. B-cells make antibodies; T-cells coordinate immune response.
Reading a Lymphocytes result
The absolute lymphocyte count (ALC) is the total WBC count multiplied by the lymphocyte percentage. Lymphocytes are normally about 20 to 40% of white cells. StatPearls defines lymphocytosis in adults as an ALC above 4,000/µL; a percentage above 40% with a normal absolute count is only a relative lymphocytosis, for example when another cell type has fallen.
Common causes of a high result
- Viral infection, such as mononucleosis, mumps or measles
- Infectious hepatitis
- Tuberculosis and other chronic bacterial infections
- Autoimmune disease or hyperthyroidism
- Lymphocytic leukemia (CLL)
Common causes of a low result
- HIV/AIDS
- Corticosteroid use
- Chemotherapy or radiation
- Sepsis
- Aging
What to check next
- A repeat CBC with differential to see whether a high count persists
- If lymphocytosis persists: a blood smear and flow cytometry, which ARUP says are generally enough to diagnose CLL
- CLL requires at least 5 x 10^9/L monoclonal B cells for at least 3 months (ARUP); smaller clones are called monoclonal B lymphocytosis
Sources: MedlinePlus: Blood differential test; StatPearls: Lymphocytosis (Hamad, Mangla); StatPearls: Leukocytosis (Mank, Killeen); ARUP Consult: Chronic lymphocytic leukemia. Checked against these sources 2026-09-23. General information, not medical advice; your lab's reference interval and your clinician's reading take precedence.
Which Providers Test Lymphocytes?
Cheapest: Oura Health Panels at $99/year. Most comprehensive: Function Health, 160+ biomarkers for $365/year.
20 panels that include it, cheapest first
| Provider | Annual Cost | Total Biomarkers | $/Biomarker |
|---|---|---|---|
| $99 | 50 | $1.98 | |
| $190 | 100+ | $1.90 | |
| $250 | 65 | $3.85 | |
| $297 | 100+ | $2.97 | |
 Labcorp OnDemand | $338 | 50+ | $6.76 |
 Superpower | $349 | 100+ | $3.49 |
| $349 | 75+ | $4.65 | |
 WHOOP Advanced Labs | $349 | 65 | $5.37 |
 Function Health | $365 | 160+ | $2.28 |
| $365 | 100+ | $3.65 | |
| $375 | 108 | $3.47 | |
| $449 | 83 | $5.41 | |
| $495 | 80+ | $6.19 | |
| $499 | 100+ | $4.99 | |
| $700 | 138 | $5.07 | |
| $829 | 54 | $15.35 | |
| $895 | 100+ | $8.95 | |
| $1188 | 70+ | $16.97 | |
| $1198 | 40+ | $29.95 | |
| $1950 | 130+ | $15.00 |
$/Biomarker is annual cost divided by the panel's advertised biomarker count, not the price of this one test. We track 23 blood test providers (32 plans); 21 of those plans are itemized marker by marker. Compare all of them.
1 itemized panel does not include Lymphocytes
11 providers not itemized in our matrix
We have not itemized these marker by marker (some sell tests one at a time), so this page cannot say whether they offer Lymphocytes. Check with them directly.
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Frequently Asked Questions
What is the optimal range for Lymphocytes?
No institution or named practitioner we track states an optimal target for Lymphocytes. General guidance without a named source: Within reference (No separate optimal established). Published reference intervals: 20-40% (1000-4000/μL) (Medscape). Lab reference interval: 20-40% or 1.0-4.0 x10^9/L. That is what a lab report flags against, not an optimal target.
Which blood test providers include Lymphocytes?
20 of the 21 blood testing panels we itemize marker by marker include Lymphocytes in their panels. This biomarker is widely available across major providers.
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 Sep 23, 2026 · First published Nov 30, 2025