The bead-based NexaTag Human Beta-defensin 103 (DEFB-3/BD-3) qIPCR ELISA Kit merges the specificity of sandwich-based ELISA, the sensitivity of real-time PCR, and the easy manipulation of microspheres to detect even the lowest levels of DEFB-3/Beta-defensin 103/BD-3 in serum, plasma, and cell culture supernatant samples.