Which specialty did House study alongside nephrology in House M.D.?

In House M.D., Gregory House studied infectious disease alongside nephrology.

The character is presented as a board-certified diagnostician with expertise in both nephrology and infectious disease. Those fields help explain the wide range of cases handled by his department: kidney disorders, systemic infections, and illnesses affecting several organs can overlap in difficult diagnostic problems.

House’s professional history is revealed gradually rather than explained in the pilot. The show emphasizes his ability to move between specialties, although his methods are often controversial and his bedside manner is famously poor. His specialty background supports the series’ premise that he can recognize patterns beyond the boundaries of one organ system.

This fact is sometimes reduced to “House is a nephrologist,” which is incomplete. Nephrology is one of his specialties, but infectious disease is the other specialty explicitly paired with it in the character’s biography. The answer is therefore the field, not a hospital department or a general description such as diagnostics.