Creatinine (24 hour urine test)

We remind you that independent interpretation of the results is unacceptable, the information provided below is for reference purposes only.

Creatinine in 24-hour urine is the total amount of creatinine excreted in the urine over a 24-hour period. Creatinine is a final product of muscle metabolism. It is produced relatively constantly and is eliminated predominantly by the kidneys.

Measuring creatinine in urine collected over 24 hours allows the assessment of daily creatinine excretion and, together with blood creatinine and other parameters, can be used to evaluate kidney function. The test may also be used to calculate the creatinine clearance rate, as recommended by a physician.

The result should be interpreted in the context of muscle mass, diet, age, and other laboratory parameters.

Indications

• assessment of urinary creatinine excretion;
• evaluation of kidney function together with blood creatinine and other parameters;
• calculation of creatinine clearance rate, as recommended by a physician;
• monitoring kidney function in certain conditions;
• assessment of the completeness of 24-hour urine collection as part of diagnostic investigations.

Procedure

The test requires collecting all urine passed over a 24-hour period in a special, clean container of sufficient volume.

In the morning, at the beginning of the collection period, the first urine sample should not be collected, but the time should be recorded. From that point onward, all urine passed must be collected, including urine passed during the night. The following morning, the first urine sample should be added to the container at the same time the collection began on the previous day.

During the collection period, the container should be stored according to the laboratory's instructions, usually in a cool place.

At the end of the 24-hour collection period, the container should be delivered to the laboratory as soon as possible, in accordance with the instructions provided.

Sources:

https://www.urmc.rochester.edu/encyclopedia/content.aspx?contenttypeid=167&contentid=creatinine_urine
https://www.mayocliniclabs.com/test-catalog/overview/610603
https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/creatinine-urine-level

IMPORTANT!

It is essential to remember that the information provided in this section is not intended for self-diagnosis or self-treatment. If you experience any symptoms or a worsening of your condition, it is crucial to consult a healthcare professional for proper diagnostic tests and treatment. Only a qualified specialist can make an accurate diagnosis and determine appropriate treatment. To ensure the most accurate and consistent evaluation of test results, it is recommended to have them conducted at the same laboratory. Different laboratories may employ varying methods and units of measurement for similar tests.