Leukozyten

White blood cells (WBCs), also known as leukocytes, are a critical component of the immune system, responsible for defending the body against infectious disease and foreign invaders. They are produced in the bone marrow and circulate throughout the blood 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 count is a fundamental part of a complete blood count (CBC) and serves as an indicator of immune system activity. Elevated WBC counts can indicate infection, inflammation, stress, or hematological disorders, while low counts may suggest bone marrow suppression, autoimmune conditions, or viral infections. In the context of athletic performance and biohacking, maintaining an optimal WBC count is crucial for recovery and resistance to infections, which can impact training outcomes and overall health. However, factors such as intense physical exertion, stress, and circadian rhythms can influence WBC levels. Researchers have noted that certain conditions, like post-COVID-19 syndrome, can cause persistent alterations in WBC counts, emphasizing the need for careful interpretation of results. Confounders such as recent infections, medications, and physiological stressors should be considered when evaluating WBC levels. Testing is typically performed without fasting, although consistency in testing conditions is advised for accurate longitudinal assessment.