noun
serology
Medical and laboratory field studying blood serum, especially immune responses and antibodies.
血清学の検査で抗体の有無を調べる。
We test for the presence of antibodies using serological examination.
免疫学 is the broader field of immunology, while 血清学 focuses specifically on serum and antibody reactions.
Compound of 血清 (blood serum) and 学 (study, -ology).