The 24-hour creatinine clearance test measures kidney function by assessing how well the kidneys filter creatinine, a waste product, from the blood. It involves collecting all urine produced in a 24-hour period and also requires a blood sample for creatinine levels. The test calculates the clearance rate, which reflects the efficiency of the kidneys. Patients are usually instructed to start the collection after a specific time, ensuring all urine is collected in a provided container. Factors like diet, medications, and hydration can impact results. The test is useful for diagnosing kidney disorders, monitoring kidney function over time, and adjusting treatments. Accurate collection and adherence to instructions are crucial for reliable results.
Frequently Asked Questions
The test assesses kidney function by measuring how effectively the kidneys filter creatinine from the blood over a 24-hour period.
Follow your healthcare provider’s instructions, which may include avoiding certain medications, maintaining a normal diet, and ensuring proper hydration.
Start the collection after a specific time, discard the first urine of the day, and keep all subsequent urine in the container for 24 hours.
Normal ranges vary by age, sex, and body size, but typical values are generally between 90 and 140 mL/min for adults.
The test calculates creatinine clearance by measuring the creatinine concentration in both the urine and blood, along with the volume of urine collected over 24 hours.
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