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Lymphocytes (Absolute)

Absolute count of T, B, and natural killer cells that support immune defense and memory. Influenced by recent infection, stress, strenuous exercise, and corticosteroids.
Also known as:
Absolute lymphocyte countLYMabsLymphocyte countALCLYM#LYM (Abs)Lymphs (Abs).
Do not confuse with lymphocyte percentage (LYM), which reports the proportion of white blood cells.

Lymphocytes (Absolute) ranges

Interpret your result
Normal reference range: 0.8–3.9 x10^9/L
0.8
3.9
According to OptimalDX, Lymphocytes (Absolute) should be between 1.44 and 2.54 x10^9/L:
1.44
2.54
Higher all-cause mortality was associated with Lymphocytes (Absolute) below 1.25 x10^9/L:
1.25
1.45
Optimal range
Optimal range for Lymphocytes (Absolute) appears to be between 1.5 and 3.5 x10^9/L:
0
1
1.5
3.5
3.9
6.2
Why this optimal range?
Preliminary range is based on functional health organizations including but not limited to those listed above.

What a low value may mean:

Common reasons for low Lymphocytes (Absolute):

  • Temporary changes: Recent viral illness, physical stress, or recovery after strenuous exercise can temporarily lower circulating lymphocytes.

    Medications: Corticosteroids, other immunosuppressants, and chemotherapy can reduce lymphocyte counts.

    Nutrition and alcohol: Protein-energy malnutrition, zinc deficiency, and excessive alcohol intake can contribute.

    Other causes: Chronic infections such as HIV or tuberculosis, autoimmune disease such as lupus, chronic kidney disease, lymphoma, and rare inherited immunodeficiencies.

    Persistent low counts: Interpret repeat measurements after recovery from acute illness. Persistent unexplained lymphopenia deserves further assessment, especially with recurrent or unusual infections.

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What a high value may mean:

Common reasons for high Lymphocytes (Absolute):

  • Infection: A reactive increase during viral illness, especially Epstein-Barr virus or cytomegalovirus infection, is common. Pertussis and some chronic infections can also raise the count.

    Smoking: Smoking can cause a mild persistent increase.

    Temporary changes: Acute stress or strenuous exercise can briefly increase circulating lymphocytes.

    Other causes: Drug hypersensitivity reactions and previous splenectomy.

    Persistent high counts: Unexplained elevation can reflect a lymphoproliferative disorder, such as chronic lymphocytic leukemia, particularly in older adults.

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Images:

The lowest lymphocyte-count decile had the highest all-cause mortality

The lowest lymphocyte-count decile had the highest all-cause mortality

477,401 participants
UK adults aged 37–73 years with differential leukocyte counts
Dataset: UK Biobank
Prospective population-based cohort study
Absolute lymphocyte counts showed a small decline with age

Absolute lymphocyte counts showed a small decline with age

Figure S3. Age explained 0.7% of the variation in absolute lymphocyte count (R² = 0.007).
108,136 participants
White adults of Danish descent, aged 20–100 years
Dataset: Copenhagen General Population Study
Prospective population-based cohort study
About 95% of lymphocyte counts were between 1.1 and 3.7 × 10⁹/L

About 95% of lymphocyte counts were between 1.1 and 3.7 × 10⁹/L

Figure S4. Red lines mark the 2.5th and 97.5th percentiles.
108,136 participants
White adults of Danish descent, aged 20–100 years
Dataset: Copenhagen General Population Study
Prospective population-based cohort study
Low absolute lymphocyte counts were associated with higher all-cause mortality

Low absolute lymphocyte counts were associated with higher all-cause mortality

Figure 1. Adjusted all-cause mortality HR; Reference count: 2.1 × 10⁹/L.
108,136 participants
White adults of Danish descent, aged 20–100 years
Dataset: Copenhagen General Population Study
Prospective population-based cohort study

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I am particularly interested in research on biomarkers associated with all-cause mortality and on defining optimal reference ranges.