se·rol·o·gy 
(sĭ-rŏlə-jē)
(sĭ-rŏlə-jē)n. pl. se·rol·o·gies
1. The science that deals with the properties and reactions of serums, especially blood serum.
2. The characteristics of a disease or organism shown by study of blood serums: the serology of acquired immune deficiency syndrome; the serology of mammals.
se′ro·logic (sîr′ə-lŏjĭk), se′ro·logi·cal (-ĭ-kəl) adj.
se′ro·logi·cal·ly adv.
se·rolo·gist n.