autoantibody

noun

1. An antibody formed in response to an agent (autoantigen) produced by the organism itself.

   “In addition to having a relative with Type 1, people in that subgroup had insulin autoantibody levels equal to or greater than 80 milliunits per milliliter.”

   “The current study investigates autoantibodies against steroid synthesis enzymes in dogs with spontaneous hypoadrenocorticism.”