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Monocytes (Absolute)

White blood cells that clear microbes and debris and coordinate inflammation. Can develop into tissue macrophages.
Also known as:
Absolute monocyte countMONOabsMonocyte countAMCMONO#.
Do not confuse with monocyte percentage, which reports the proportion of white blood cells.

Monocytes (Absolute) ranges

Interpret your result
Normal reference range: 0.1–0.95 x10^9/L
0.1
0.95
According to OptimalDX, Monocytes (Absolute) should be between 0.2 and 0.4 x10^9/L:
0.2
0.4
Optimal range
Optimal range for Monocytes (Absolute) appears to be between 0.2 and 0.5 x10^9/L:
0
0.1
0.2
0.5
0.8
1.8
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 Monocytes (Absolute):

  • Temporary changes: Recent infections and acute physical stress can temporarily lower circulating monocytes.

    Medications: Corticosteroids and chemotherapy can reduce counts, sometimes alongside other white blood cells.

    Less common: Bone marrow failure, hairy cell leukemia, HIV, and rare inherited immune disorders. Persistent unexplained low counts warrant assessment, especially with recurrent infections or other abnormal blood counts.

    ,,

What a high value may mean:

Common reasons for high Monocytes (Absolute):

  • Recent illness and physical stress: Infection, recovery after illness or bone marrow suppression, and strenuous exercise can cause temporary increases.

    Lifestyle and chronic inflammation: Smoking, obesity, and metabolic syndrome are associated with higher counts. Persistent increases also occur with chronic infections, rheumatoid arthritis, and inflammatory bowel disease.

    Less common: Bone marrow disorders, including chronic myelomonocytic leukemia. Persistent unexplained monocytosis warrants assessment, especially when other blood counts are abnormal.

    ,,,,

Images:

Mortality rose steeply at high monocyte counts and slightly at the lowest

Mortality rose steeply at high monocyte counts and slightly at the lowest

Figure C, panel A. Adjusted HRs with 95% CIs; reference: fifth sex-specific decile. Added absolute cutoffs from supplementary Table I; observational associations do not establish an optimal target.
477,401 participants
UK adults aged 37–73 years with differential leukocyte counts
Dataset: UK Biobank
Prospective population-based cohort study
Monocyte counts were higher in men and rose after age 60

Monocyte counts were higher in men and rose after age 60

Figure 1A. Means with standard deviations by age group; cross-sectional comparisons, not individual trajectories.
144,676 participants
Community-dwelling adults aged 18 years and older in the Netherlands
Dataset: Lifelines
Population-based cohort with nested case-control study
The monocyte-count distribution was shifted higher in men

The monocyte-count distribution was shifted higher in men

Figure 1B, absolute-count panel. Violin width shows relative density. The 0.5 × 10⁹/L line marks a study classification threshold, not a normal or optimal limit.
431,531 participants
UK Biobank adults with CBC and exome data, excluding baseline hematologic malignancy
Dataset: UK Biobank
Population-based observational cohort study

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Zsolt Szabo
Zsolt Szabo Founder, Longevity-tools.com
Precision health consultant for labs and clinics

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