What's this test for?

This test is ideal if you're concerned about kidney health, have risk factors like diabetes or high blood pressure, or want to catch kidney problems early before symptoms appear. It measures cystatin-C, a more accurate marker of kidney function than standard tests, especially useful for people with low muscle mass or older adults. Many people use this test when they want a precise assessment of how well their kidneys are filtering waste and maintaining overall health.

What happens after I get my results?

You'll receive detailed doctor notes in simple language explaining what your kidney function levels mean for your overall health and wellness. These notes include personalized recommendations like dietary changes, hydration strategies, or whether you should follow up with a nephrologist or your primary care doctor. You'll also get the standard lab report and can track your kidney function over time using our trends feature to monitor any changes or improvements.

What's included in this test?

This test measures Cystatin-C and eGFR (estimated glomerular filtration rate). Cystatin-C is a protein that provides a more accurate picture of kidney function than traditional tests, especially for people with different muscle masses or body types. The eGFR calculation uses your cystatin-C level to estimate how efficiently your kidneys are filtering waste from your blood, giving you a precise measure of kidney health and early warning of potential issues.

How should I prepare for this test?

No fasting is needed for this test. You can eat and drink normally before your blood draw. Just arrive at the lab during their operating hours and bring your test requisition form. It's a simple blood draw that takes just a few minutes.

Who should consider getting this test?

This test is especially valuable for people with diabetes, high blood pressure, or a family history of kidney disease who need accurate kidney monitoring. It's also ideal for older adults, people with low muscle mass, bodybuilders, or those on certain medications where standard kidney tests might not be as accurate. Anyone wanting an early and precise assessment of kidney health should consider this test.

What symptoms indicate I may need this test?

Common signs include swelling in your legs, ankles, or feet, frequent urination especially at night, foamy or bubbly urine, or persistent fatigue. You might also notice changes in urine color, difficulty concentrating, poor appetite, or muscle cramps. However, early kidney problems often have no symptoms, which is why preventive testing is so important if you have risk factors.

How can I naturally support my kidney health?

Supporting kidney health starts with staying well-hydrated by drinking plenty of water throughout the day. Limit processed foods high in sodium and focus on fresh fruits, vegetables, and whole grains. Regular exercise, maintaining a healthy weight, and managing blood pressure and blood sugar levels are crucial. Avoid overuse of pain medications like ibuprofen and limit alcohol consumption.

What is Cystatin-C and why does it matter?

Cystatin-C is a small protein produced by all cells in your body at a constant rate. Your kidneys filter it out of your blood, so the level in your blood reflects how well your kidneys are working. Unlike creatinine (the standard kidney test), cystatin-C isn't affected by muscle mass, age, or diet, making it a more accurate and reliable marker of kidney function for most people.

What does high Cystatin-C mean?

High cystatin-C levels indicate that your kidneys aren't filtering waste as efficiently as they should. This could mean early kidney disease, reduced kidney function, or that your kidneys are under stress from conditions like diabetes or high blood pressure. It's an important early warning sign that allows you to take action before more serious kidney damage occurs.

How often should I retest my kidney function?

If you have risk factors like diabetes or high blood pressure, testing every 6-12 months is recommended to catch changes early. If your results are normal but you have a family history of kidney disease, annual testing is wise. People with known kidney issues or on medications that affect the kidneys may need testing every 3-6 months as directed by their healthcare provider.

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.

Kidney Function Test - Cystatin-C & eGFR 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]

Blood Test for Kidney Function and Health

Cystatin-C

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

What's this test for?

How should I prepare for this test?

What's included in this test?

Here’s why 1,000,000+ customers chose us for affordable hassle-free private blood testing.

Blood Test for Kidney Function and Health

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

1,000,000+ blood tests later, here's what our customers say