Leukocyte Count and Cardiovascular Disease Risk

Leukocyte count, a routine component of the complete blood count, has emerged as a readily available marker of systemic inflammation and an independent predictor of cardiovascular disease (CVD) risk. Elevated levels of total white blood cells and specific subpopulations—including neutrophils, monocytes and lymphocytes—contribute to endothelial activation, atheroma formation and plaque destabilisation. Neutrophils release proteolytic enzymes and reactive oxygen species, monocytes differentiate into lipid‐laden foam cells and lymphocytes modulate chronic inflammatory responses. Epidemiological studies across diverse populations have linked higher leukocyte subtypes with incident coronary artery disease, stroke and heart failure, while dynamic changes in counts may reflect responses to lifestyle interventions or therapeutic agents. Integration of leukocyte indices into risk stratification offers the potential to enhance prediction beyond classical factors, guide anti‐inflammatory strategies and inform personalised prevention at the global scale.

Research from Nature Portfolio

Recent studies have examined the association between pre‐diagnostic complete blood counts and long‐term cardiovascular outcomes. A large European cohort demonstrated that individuals in the highest tertiles of total white blood cell, neutrophil, lymphocyte and monocyte counts faced a markedly increased incidence of CVD over more than a decade of follow‐up. Although the addition of leukocyte indices to traditional risk models yielded only modest improvements in 10‐year risk prediction, the findings reinforce the role of low‐grade inflammation in disease initiation and support further research on targeted anti‐inflammatory interventions. These data underscore the value of differential leukocyte profiling in refining risk assessment in ostensibly healthy populations.

Leukocyte Count and Cardiovascular Disease Risk publication trend

The graph below shows the total number of articles in leukocyte count and cardiovascular disease risk across all publications each year (not limited to Nature Index journals).

Technical terms

Leukocyte count: The total number of white blood cells in peripheral blood, reflecting overall inflammatory activity.

Neutrophil-to-lymphocyte ratio (NLR): The ratio of neutrophils to lymphocytes, used as a composite marker of systemic inflammation.

Absolute neutrophil count (ANC): The total number of neutrophils per unit volume of blood, indicative of acute inflammatory response.

Mendelian randomisation: A genetic epidemiology method using genetic variants as proxies for modifiable exposures to assess causal relations.

Systemic inflammation: A chronic, low‐grade immune activation state characterised by elevated circulating inflammatory cells and mediators.

References

1. Associations Between Leisure-Time Physical Activity Level and Peripheral Immune Cell Populations in the US General Population, Analysis of the National Health and Nutrition Examination Survey Data, 1999–2018. Sports Medicine - Open (2023).
2. High absolute neutrophil count with type 2 diabetes is associated with adverse outcome in patients with coronary artery disease: A large-scale cohort study. Frontiers in Endocrinology (2023).
3. Potential causal and temporal relationship between plasma triglyceride levels and circulating leukocyte. Journal of Lipid Research (2024).
4. Elements of the complete blood count associated with cardiovascular disease incidence: Findings from the EPIC-NL cohort study. Scientific Reports (2018).