serology

noun

1. 1

   The science that studies the blood serum, and especially the reaction between antigens and antibodies in serum.

2. 2

   The characteristics of the blood serum in a particular disease or organism.

3. 3

   A blood test to detect the presence of, and often to measure the amount of, various components of the serum (such as electrolytes, antibodies, and antigens).