immunoreactive
/ˌɪmjʊnəʊrɪˈaktɪv/ /ɪˌmjuːnəʊrɪˈaktɪv/Medicine and Biology
adjective
1Capable of reacting with a specific antibody; detected or measured by means of an immunological assay or technique.
2Participating in an immune response; capable of such participation.
Origin
1960s; earliest use found in The Lancet. From immuno- + reactive.