serodiagnosis

noun, plural se·ro·di·ag·no·ses [seer-oh-dahy-uh g-noh-seez] /ˌsɪər oʊˌdaɪ əgˈnoʊ siz/. Medicine/Medical.

1. a diagnosis involving tests on blood serum or other serous fluid of the body.

n. pl. se•ro•di•ag•no•ses (-sēz)

1. Diagnosis of disease based on reactions in the blood serum.