Leukocytes are critical components that enhance the body's immune response against pathogens, particularly bacterial infections, parasitic infections, and toxins. However, an increase in leukocyte count can signify serious underlying conditions.

Leukopenia can be caused by inherited autoimmune diseases, immune system deficiency, some diseases, or using certain medications that cause side effects.

Blood viscosity is determined by red blood cells and protein components in plasma. Measuring blood viscosity is highly valuable in assessing thrombotic disorders.