What's this test for?

This test is ideal if you're experiencing unexplained fatigue, swelling, changes in urination, or if you've been told your kidney function needs a closer look. It's also used to confirm that a 24-hour urine collection was done correctly when checking other substances like protein. If you have muscle-related concerns or a condition that affects your kidneys, this test helps track how well your body is filtering waste.

What's included in this test?

This test measures how much creatinine your body clears into urine over a full day, which reflects how efficiently your kidneys are filtering waste and how much muscle mass you have. Because creatinine output stays fairly steady day to day in healthy people, this single measurement gives a reliable snapshot of kidney filtering ability and also helps verify that a 24-hour urine sample was collected properly.

What happens after I get my results?

Your results will show up in your account with the normal range clearly explained next to your value. If your number falls outside the expected range, the report will note simple next steps, such as adjusting your protein intake, staying well hydrated, or retesting after a few weeks to confirm the result. You can download a standard lab report from your account at any time, and the trends feature lets you compare this result to future tests so you can see how your kidney health changes over time. If a result is significantly abnormal, seek medical care promptly.

How can I naturally support kidney function?

Staying well hydrated throughout the day helps your kidneys flush out waste more effectively. Cutting back on excess salt, processed foods, and very high protein intake can ease the workload on your kidneys. Regular light exercise and maintaining a healthy weight also support long-term kidney health, and limiting alcohol can make a noticeable difference too.

When will I get my results?

Results are typically ready within about 7 days of your lab visit. Once processed, they'll be uploaded directly to your secure online account, where you can view your value alongside the normal range and download the full report.

Who should consider this test?

People with a family history of kidney disease, those with diabetes or high blood pressure, and anyone experiencing swelling, fatigue, or changes in urine output should consider this test. It's also useful for people monitoring muscle mass changes or confirming the accuracy of a 24-hour urine collection for other tests. Athletes and bodybuilders sometimes use it to understand how muscle breakdown affects their results.

What symptoms indicate I may need this test?

Watch for symptoms like persistent swelling in the legs or feet, unusual fatigue, foamy or discolored urine, or a noticeable drop in how often you urinate. Muscle cramps, unexplained weight changes, or a known history of kidney issues are also good reasons to check your creatinine levels. If you notice any of these along with feeling generally unwell, it's worth getting tested.

What does high creatinine excretion mean?

Higher than expected creatinine in a 24-hour urine sample can reflect greater muscle mass, recent intense exercise, or in some cases a diet very high in meat. It generally isn't a red flag on its own, but if it's paired with other unusual results, it may be worth a retest along with a broader kidney health check. Staying hydrated and moderating protein intake before retesting can help clarify the picture.

What does low creatinine excretion mean?

Lower than expected creatinine excretion can point to reduced kidney filtering ability, lower muscle mass, or an incomplete urine collection. If your levels come back low, double-check that the full 24-hour collection was done correctly before assuming it reflects kidney function. Retesting with careful attention to collection instructions is often the first practical step.

How often should I retest?

If your first result is within the normal range and you have no ongoing symptoms, retesting once a year or as part of a routine wellness check is generally enough. If you're managing a kidney-related condition or your result was outside the normal range, retesting every few months can help you track whether lifestyle changes are making a difference. Always retest sooner if new symptoms appear.

Getting your blood test with us is easy, private & backed by the power of science.Long story short: In the test options, use the filters or search box to narrow your choices and find the test you want. If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test. Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout. If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want. When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system. Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy! If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

How do I know which test to get?

In the test options, find the test you want. If you’re not sure which test to get, we can lend a hand in finding the right option. Just text or call us at 754-799-7833, email us at support@privatemdlabs.com, and we'll gladly help you. We've got your back and reply quickly.

When will my lab results be available?

Most test results will be available within 1–3 business days. Once they're ready, we'll send an email and text message to let you know. After your blood draw, just hang tight and don't worry – we'll keep you updated and in the loop! If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com, and we'll gladly help you.

Is it possible to make changes to my lab order if I made a mistake with the name, date of birth, or any other details?

Absolutely! We totally understand that errors can happen. No worries, we're here to help you. Just reach out to us via text at 754-799-7833 or shoot us an email at support@privatemdlabs.com. Remember to include your order number and let us know the correct information you’d like to update. Our awesome team will jump right in and make sure everything is sorted out and accurate for you. There are no changes necessary if your address is wrong on the requisition though. We don’t mail anything out. Our lab requires an address to be listed to generate an order.

Do you accept health insurance?

Only HSA & FSA is accepted. Our services are strictly self-pay and cannot be submitted to your health insurance provider except for Health Savings Accounts or Flexible Savings Accounts. This policy applies to all insurance companies, including federal health insurance programs like Medicare. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com.

Can I cancel my order?

Yes. We get it – sometimes your needs change. As long as your samples haven’t been collected yet, we’re happy to help you cancel your order. If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com. You can read more about our cancellation policy here.

How can I find a lab location near me?

During the ordering process, you’ll be able to select a specific lab near you, with no strings attached! You can switch it up later easily and visit any of our authorized locations as long as it’s the same lab company you selected your test for (Quest Diagnostics or Labcorp). Before you proceed with your order, feel free to browse through all our lab locations here. This will give you the peace of mind of knowing that there's a lab nearby your home, office or your favorite gym. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

24-Hour Urine Creatinine Test - Kidney Function Check

Getting your blood test with us is easy, private & backed by the power of science.

Long story short:

In the test options, use the filters or search box to narrow your choices and find the test you want.
If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test.
Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout.
If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want.
When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system.
Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way.
You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!

754-799-7833

[email protected]