Creatinine with Estimated Glomerular Filtration Rate (eGFR)
Your core measure of how well the kidneys are filtering waste from the blood.
Consider this test if:
- Diabetes, high blood pressure, or a family history of kidney disease
- Establishing a kidney-function baseline to track over time
- Taking medications that are cleared by or can affect the kidneys
- Following up an abnormal creatinine or eGFR to confirm a trend
- Swelling, changes in urination, or fatigue being worked up alongside other causes
- HSA/FSA eligible
- Typical results in 1 day · Reviewed by a real clinician
- Drawn at a CLIA/CAP-accredited lab near you ·
Pre-test considerations
A morning blood draw is typical. Fasting is not strictly required for creatinine and eGFR, though many labs request a 12-hour fast when this is drawn with glucose or a broader metabolic panel. A large protein or cooked-meat meal and intense exercise shortly before the draw can transiently raise creatinine, and creatine supplements can also nudge it up, so keep habits consistent when comparing results over time.
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What this test is for
Creatinine is a waste product of normal muscle metabolism that healthy kidneys clear at a steady rate, so a rising blood level signals reduced filtering capacity. The eGFR converts that creatinine value, along with your age and sex, into an estimate of filtration rate using the CKD-EPI 2021 equation, which no longer includes a race coefficient. A low eGFR or high creatinine points toward reduced kidney function and is the recommended first step in evaluating and monitoring chronic kidney disease, which often progresses quietly and is most common in people with diabetes, high blood pressure, or a family history of kidney disease. Creatinine reflects muscle mass as well as kidney function, so very muscular or very low-muscle individuals can have results that shift the estimate, which is why eGFR is read as an estimate rather than an exact filtration number.
This pairing is the standard serum-based kidney check. If your question involves early protein leakage, the Kidney Panel adds a urine albumin-to-creatinine ratio, and Creatinine Clearance uses a 24-hour urine collection for a more direct filtration measurement.
Biomarkers tested
Includes 2 biomarkers
Creatinine is a waste product released as your muscles break down creatine for energy, and your kidneys filter it out of the blood at a steady rate. When creatinine rises, it usually means the kidneys are filtering less efficiently, making it the core marker for kidney function and the basis for calculating eGFR. Test it as a baseline for kidney health, to monitor the impact of blood pressure, diabetes, high-protein diets, or supplements like creatine, or to investigate unexplained fatigue, swelling, or changes in urination.
- Specimen
- Serum or plasma
- Measures
- Mass concentration
- Specimen
- Serum, plasma, or blood
- Method
- Creatinine-based (CKD-EPI)
- Measures
- Ratio
What to expect
- 1 Book instantly
Click, book, done. Choose a convenient lab location near you. Transparent, up-front pricing.
- 2 Quick lab visit
Testing to fit your busy schedule, usually 15 minutes or less. Walk-in and appointments available.
- 3 Typical results in 1 day
Your results post straight to your dashboard as soon as the lab completes them.
- 4 Expert guidance
Included with Mito membership. A clinician reviews your results and your personalized action plan follows, with clear next steps.
Everything your health needs,
in one membership
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Every test at our cost
Members pay our cost on every test, with lab fees passed straight through. The full receipt is itemized, never padded.
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Continuous tracking, all in one place
Upload past labs and watch your trends over time. Every marker and visit lives in one longitudinal record, so all your care stays together.
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Year-round clinician support
Text anytime and get clinician-reviewed answers. When you want to go deeper, 1:1 consultations are available at affordable rates.
All for $9/month
Order any test or consult without joining. For $9/month, members unlock member prices, trend tracking, and year-round clinician guidance.
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$9 /mo
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Without membership
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Frequently asked questions
View all FAQsHow does pricing work?
Every test shows the member price next to the standard non-member price, so you can see what membership saves you. The member price is our cost — covering the lab and what it takes to run the service — never a profit on the test itself; Mito makes its money on the $9 membership, not on marking up your tests. Membership is $9/mo, and you still pay the lab’s order fee. Prices are itemized before you pay, with no hidden fees.
Where do I get tested?
Choose a partner lab (Quest, Labcorp, or BioReference) at checkout. If your cart spans multiple tests, we consolidate the whole order onto a single lab so you only make one visit.
Is this eligible for HSA/FSA?
Yes. This test is HSA/FSA eligible, and you can pay with your HSA/FSA card at checkout.
When will I get my results?
Your results post to your dashboard once your lab completes them, then a clinician reviews them and your full analysis and personalized action plan (with clear next steps) follow. Turnaround varies by test: specialty assays and at-home kits take longer, and each test shows its expected turnaround before you buy.
Do I need a doctor’s order?
No. Mito provides the lab order for you, so you can book and get tested without a separate doctor visit.
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