immunoelectrophoresis

ˌɪmjʊnəʊɪˌlɛktrə(ʊ)fəˈriːsɪs
ɪˌmjuːnəʊɪˌlɛktrə(ʊ)fəˈriːsɪs

noun

a technique for the identification of proteins in serum or other fluid by electrophoresis and subsequent immunodiffusion.