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Blutwerte · Marker

Leukozyten

White Blood Cells · WBC · Weiße Blutkörperchen

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Einheit:
x10^9/L
Abbreviation
WBC

The WBC test quantifies the total number of white blood cells in the blood, reflecting immune system activity.

Reference Ranges

Reference
411x10^9/L
4
11
LowNormalHigh
Reference
Unit · x10^9/L

Reference ranges may vary slightly based on laboratory standards and individual factors such as age and sex.

Overview

Übersicht

White blood cells (WBCs), also known as leukocytes, are a critical component of the immune system, responsible for defending the body against infections and foreign invaders. They are produced in the bone marrow and circulate throughout the bloodstream and lymphatic system. WBCs are categorized into several types, including neutrophils, lymphocytes, monocytes, eosinophils, and basophils, each playing distinct roles in immune response. Clinically, WBC counts are essential for diagnosing and monitoring various conditions, such as infections, inflammatory diseases, and hematological disorders. Elevated WBC counts, or leukocytosis, can indicate infections, inflammation, stress, or leukemia, while low counts, or leukopenia, may suggest bone marrow disorders, autoimmune diseases, or the effects of certain medications. For athletes and biohackers, maintaining optimal WBC levels is crucial for ensuring robust immune function and recovery from physical stress. However, factors such as intense exercise, stress, and infections can transiently alter WBC counts. Researchers have observed that time of day, recent physical activity, and nutritional status can influence WBC measurements, necessitating standardized testing conditions to ensure accurate results.

Klinische Bedeutung

Elevated WBC counts may indicate infections, inflammation, or stress, while reduced counts can suggest bone marrow suppression, autoimmune disorders, or the effects of certain medications.

Dynamics

Trend Interpretation

Rising Values

Progressively rising WBC counts may suggest an ongoing infection or inflammatory process. Re-testing is recommended if values remain elevated.

Falling Values

Progressively falling WBC counts could indicate bone marrow suppression or recovery from an infection.

Re-test Interval

4 weeks if outside optimal range

Etiology

Causes — High & Low

Cause

Elevated Levels

  • Infections
  • Inflammation
  • Stress
  • Leukemia
  • Allergic reactions
Cause

Low Levels

  • Bone marrow disorders
  • Autoimmune diseases
  • Viral infections
  • Chemotherapy
  • Radiation therapy
Protocol

How to Optimize

Lever

Lifestyle

  • Regular moderate exercise
  • Adequate sleep
  • Stress management
Lever

Nutrition

  • Balanced diet rich in fruits and vegetables
  • Adequate protein intake
  • Hydration
Lever

Supplementation

  • Vitamin C
  • Zinc
  • Echinacea
  • Probiotics

Note:

Consult a healthcare provider before making significant lifestyle changes, especially if underlying health conditions are present.

Testing Guidelines

Fasting Not Required
🕐Time-Sensitive

WBC counts can vary throughout the day; morning samples are typically preferred for consistency.

Testing Frequency

Annually for healthy adults, more frequently if monitoring a specific condition.

Interfering Factors

  • Recent intense exercise
  • Emotional stress
  • Infections

Open Research Questions

Current research suggests that the reference ranges for white blood cell (WBC) counts, particularly in post-COVID-19 syndrome and following acute stressors like electrical weapon exposure, remain debated, with a need for standardized definitions of leukopenia and leukocytosis. Researchers have not yet established the optimal WBC targets for various clinical contexts, such as osteoarthritis and hemodialysis. Unanswered clinical questions include the long-term implications of altered WBC counts on patient outcomes and the mechanisms driving these changes.

35 Research Publications

557

Total Citations

23

Human/RCT

2.3

Avg. Influence

2025

Latest

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#01

DNA methylation in white blood cells: association with risk factors in epidemiologic studies.

ReviewInfluence9.0
333
Researchers explored the association between DNA methylation in white blood cells and various health outcomes. They found emerging evidence linking changes in WBC methylation patterns to several cancers and other diseases, although more extensive studies are needed.
View on PubMed
#02

Digital image analysis of blood cells.

Review
42
This study examined the use of digital image analysis for counting various blood cells, including white blood cells (WBCs). Researchers found that automated microscopy analyzers can provide accurate WBC differential counts, potentially replacing manual microscopy, but the expertise of cytologists remains essential for certain cases.
View on PubMed
#03

Hypoxemia during hemodialysis.

Human
37
This study assessed the impact of hemodialysis on blood oxygen levels and white blood cell counts. Researchers found that WBC counts decreased significantly during dialysis, suggesting a link between leuko-agglutination and hypoxemia in patients undergoing this treatment.
View on PubMed
#04

Leukocytosis in rheumatoid arthritis.

HumanInfluence1.0
29
This study examined the prevalence of leukocytosis in patients with rheumatoid arthritis. Researchers found that leukocytosis was present in 27% of patients, primarily due to increased neutrophils, and was associated with more active arthritis.
View on PubMed
#05

Hepatic Steatosis Is Associated with High White Blood Cell and Platelet Counts.

Human
15
Researchers investigated the relationship between white blood cell (WBC) and platelet counts with hepatic steatosis in a large cohort. They found significant associations between higher WBC counts and the severity of hepatic steatosis, suggesting that WBC counts may be useful in identifying at-risk individuals.
View on PubMed
#06

White Blood Cell and Platelet Counts Are Not Suitable as Biomarkers in the Differential Diagnostics of Dementia.

Human
14
This study evaluated the role of white blood cell (WBC) and platelet counts in diagnosing dementia. Researchers found no significant differences in WBC counts between demented and non-demented patients, suggesting these are not suitable biomarkers.
View on PubMed
#07

Haematological and biochemical blood reference values for Canary Island camels (Camelus dromedarius), an endangered dromedary species.

AnimalInfluence2.0
12
This research aimed to develop reference values for blood parameters in Canary Island camels. Researchers reported a white blood cell (WBC) count range of 7.35 - 18.36 X103/µL, with variations based on age and sex.
View on PubMed
#08

Cytokine expression profiles in white blood cells of patients with small fiber neuropathy.

Human
9
This study analyzed cytokine expression profiles in white blood cells (WBCs) of patients with small fiber neuropathy (SFN). Researchers found higher expression levels of pro-inflammatory cytokines IL-2, IL-8, and TNF in SFN patients compared to healthy controls, which may aid in diagnostics.
View on PubMed
#09

A Clinical Diagnostic Study: Fibulin-2 is a Novel Promising Biomarker for Predicting Infection.

HumanInfluence2.0
9
This clinical study assessed fibulin-2 as a potential biomarker for early infection diagnosis. Researchers found that fibulin-2 levels were elevated in infected patients compared to non-infected individuals, outperforming traditional biomarkers like WBC in diagnostic ability.
View on PubMed
#10

Hematological and biochemical reference intervals of wild-caught and inhouse adult Indian rhesus macaques (Macaca mulatta).

Animal
8
This study established reference values for hematological parameters in Indian rhesus macaques. Researchers found that wild-born macaques had higher white blood cell (WBC) counts compared to inhouse animals, indicating differences based on origin.
View on PubMed

Publication Trend

Research publications about Leukozyten over time

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