In House M.D., what disease does Thirteen eventually test positive for?

In House M.D., Thirteen eventually tests positive for Huntington’s disease.

Thirteen, whose real name is Remy Hadley, learns that she carries the genetic mutation associated with Huntington’s disease. The condition is an inherited neurodegenerative disorder that can affect movement, cognition, and behavior over time.

The diagnosis gives the character a long-running personal storyline. Her mother died from Huntington’s, and Thirteen worries about the disease’s progression while continuing to work as a physician. The uncertainty influences her relationships, treatment decisions, and views about the future.

Huntington’s disease is caused by a mutation in the HTT gene and is typically inherited in an autosomal dominant pattern. The show’s storyline is fictional, but the family-history and genetic-testing elements reflect the real importance of inherited risk. Thirteen’s diagnosis should not be confused with a symptom-based diagnosis in one of House’s individual patient cases.