Used in immunological research to quantify levels of mannose-binding lectin (MBL) in human serum or plasma. Helps assess MBL deficiency, which is linked to increased susceptibility to infections, especially in infants and immunocompromised individuals. Applied in studies of innate immunity, autoimmune diseases, transplant rejection, and genetic disorders. Supports research into the role of MBL in activating the complement system via the lectin pathway. Commonly used in clinical laboratories and biomedical research settings for diagnostic development and patient stratification.