The Human PD-ECGF (platelet-derived endothelial cell growth factor, also known as thymidine phosphorylase) ELISA kit is an in vitro enzyme-linked immunosorbent assay for the quantitative measurement of human PD-ECGF in serum (human PD-ECGF concentration is low in normal serum and plasma samples, and may not be detectable in this assay), plasma and cell culture supernatants.