serologist

/sɪˈrɑlədʒɪst/
noun
  1. A scientist or medical professional who studies blood serum, especially to diagnose diseases or understand immune responses.
    • The hospital hired a new serologist to help with the growing number of blood tests.
    • The serologist examined the blood samples to check for antibodies.
    • A serologist often works in a laboratory testing for infections like HIV or hepatitis.