Urology is the health care segment that cares for the male and female urinary tract, including kidneys, ureters, bladder, and urethra. It also deals with the male sex organs. Urologists have knowledge of surgery, internal medicine, pediatrics, gynecology, and more.
Within urology, there are several areas of subspecialty, including the following:
- Pediatric urology
- Urologic oncology
- Renal transplant
- Male infertility
- Calculi
- Female urology
- Neurourology
(definition from here)