Solid phase assay measuring C4d deposition to determine complement fixation by HLA-specific antibodies

The definition of HLA-specific antibodies in solid organ transplant patients is a necessary tool for recipient selection prior to transplantation and monitoring for rejection post transplant. Solid phase assays can detect both complement fixing and non-complement fixing HLA-specific antibodies. Here we describe a method for determining the presence of complement fixing HLA-specific antibodies using a sensitive solid phase assay.