Which of the following is a test of the urinary system?

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Testing how well the kidneys filter waste is what this item is about. Creatinine clearance directly evaluates renal function by measuring how effectively the kidneys remove creatinine from the blood into the urine, usually using a timed urine collection along with a serum creatinine level. The calculation combines the amount of creatinine in urine, the urine volume collected, and the serum creatinine, giving an estimate of the kidneys’ glomerular filtration rate in milliliters per minute. This is a true test of the urinary system because it reflects the kidneys’ ability to clear waste from the bloodstream into urine.

The other options aren’t measures of urinary function: cholinesterase is an enzyme assessed in blood for different purposes, creatine kinase is a muscle or heart injury marker measured in blood, and pleuracentesis is a procedure to remove fluid from the space around the lungs, not a test of the urinary system.