Used in research settings to detect and quantify antibodies against Human polyomavirus BK (BKV) in human serum or plasma samples. Helps in studying BK virus infections, particularly in immunocompromised individuals such as organ transplant recipients. Supports investigation of viral reactivation, monitoring of immune response, and assessment of disease progression related to BKV, such as polyomavirus-associated nephropathy in kidney transplant patients. Not intended for diagnostic use.