Dr. House’s medical specialties in House M.D. are infectious disease and nephrology.
Nephrology is the medical specialty focused on the kidneys, kidney function, fluid balance, and related disorders. The show identifies House as a board-certified diagnostician with expertise in both nephrology and infectious disease, which helps explain why he is consulted on baffling cases involving many different body systems.
House usually works with a diagnostic team rather than treating patients only within his own specialties. His knowledge of kidney disease and infections often contributes an important clue, while the team performs tests and considers alternatives.
A common mix-up is confusing nephrology with urology. Nephrology is primarily a medical specialty dealing with kidney function and disease; urology is a surgical specialty involving the urinary tract and male reproductive system. House is not described as a urologist.