What is a 24-hour urine collection?

A 24-hour urine collection involves collecting all your urine over a 24-hour period. This allows for a more accurate measurement of creatinine excreted in your urine.

Why might my doctor order a creatinine test and 24-hour urine collection?

There are several reasons your doctor might order these tests:

• To assess your kidney function, especially if you have symptoms like fatigue, swelling, or frequent urination.
• To monitor existing kidney disease.
• To diagnose or monitor other conditions that can affect kidney function, such as diabetes or high blood pressure.
• To investigate muscle problems that might cause abnormally high or low creatinine levels.

What happens during a 24-hour urine collection?

• Your doctor will provide you with a special container and instructions on how to collect your urine over 24 hours.
• It's crucial to collect all your urine during the entire period, including the first urination in the morning after the 24 hours are complete.
• You will need to keep the urine collection container refrigerated throughout the day.
• Once finished, you'll return the container to your doctor's office or lab as instructed.

What do the creatinine test results mean?

High creatinine levels in your blood or urine can indicate reduced kidney function. However, other factors can also affect creatinine levels. Your doctor will interpret your results based on your medical history and other tests performed.

Are there any risks associated with these tests?

A 24-hour urine collection might be inconvenient but has no risks. A blood draw for serum creatinine involves minimal discomfort from the needle prick.

How should I prepare for these tests?

Your doctor will provide specific instructions on any preparations needed. Generally, you might need to:

• Avoid certain medications or supplements that can affect creatinine levels.
• Discuss your diet and any strenuous exercise plans with your doctor beforehand.