Which procedure involves the examination of urine?

Urinalysis is the procedure that specifically involves the examination of urine to assess various parameters, including its chemical composition, physical characteristics, and presence of any abnormal substances. This examination can provide valuable information about a person's health, including the detection of infections, metabolic disorders, and kidney function issues.

The process of urinalysis often includes visual inspection, chemical testing using dipsticks, and microscopic examination of urine sediment. By analyzing these components, healthcare practitioners can make informed decisions regarding diagnosis and treatment.

The other procedures listed do not primarily focus on examining urine. Urinary drainage refers to the process of removing urine from the bladder, often using a catheter. A urological assessment may encompass a broader range of examinations related to urinary tract health but does not specifically target urine analysis itself. Urethral testing often involves examining the urethra for issues like blockages or infections, which again does not center on analyzing urine directly.