Cystatin C with Estimated Glomerular Filtration Rate (eGFR)
Currently unavailable in your state.
A kidney filtration marker that stays accurate when muscle mass throws off creatinine.
- Member pricing close to cost, no upsells
- Schedule online, typical results in 2-5 days
- Clear guidance, results reviewed by a real clinician
- Follow-up care available
HSA/FSA eligible
About this test
Cystatin C is a small protein produced by all nucleated cells at a steady rate and freely filtered by the kidneys, so its blood level rises as filtration falls. The eGFR derived from it (using the CKD-EPI cystatin C equation with age and sex) estimates how well your kidneys are clearing waste, and it tracks early kidney decline, chronic kidney disease, and changing function during illness. Unlike creatinine, cystatin C is not affected by muscle mass, diet, or most drugs, which makes it more reliable when creatinine misleads: very muscular or malnourished people, the very elderly, those with limb loss or paralysis, and rapidly changing kidney function. It also equilibrates faster than creatinine, so it reflects acute changes sooner. If your creatinine-based eGFR is borderline or seems inconsistent with your clinical picture, cystatin C is the standard way to confirm where filtration actually stands.
Consider it if
- Creatinine-based eGFR came back borderline and you want a second, independent estimate
- Diabetes, high blood pressure, or a family history of kidney disease and you want accurate baseline filtration
- Very high or very low muscle mass that can distort creatinine readings
- Tracking kidney function over time or checking how it responds to a medication or condition change
Why are there member and non-member prices?
Members get Mito's no-markup price on tests. The non-member price is the standard price.
Mito membership is $9/month and unlocks member pricing across the catalog. It's how Mito is supported, so we don't have to mark up your tests or earn more when you buy more. Your member savings are applied at checkout.
Video call with clinician
Speak with a real clinician to discuss your labs.
What's included
What's tested
Includes 2 biomarkers
- Cystatin C
- Glomerular filtration rate
Test details
- Sample type
- Blood sample (serum preferred)
- Collection
- Partner lab visit
- Preparation
- Fasting recommended (overnight preferred)
- Results in
- Typical results in 2-5 days
Pre-test considerations
A simple blood draw. Overnight fasting is preferred but not strictly required; cystatin C is unaffected by diet, body mass, and most medications, which is part of its advantage over creatinine.
Results in as little as 1-2 business days
- 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 Results in 1-2 business days
Your results post to your dashboard fast — then a clinician reviews them and your personalized action plan follows.
- 4 Expert guidance
Our clinicians will recommend next steps. Or book a same-day visit for comprehensive care.
Everything your health needs,
in one membership
-
Cost-plus on every test you order
Members pay close to 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.
Mito Membership
$9 /mo
cancel anytime
Without membership
$0
pay as you go
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AI health coaching to help you act on your results
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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. Your price is our cost plus a small amount 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. Members pay even less, applied at checkout (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 are typically visible within 1-2 business days of your lab visit. A clinician then reviews them, and your full analysis and personalized action plan — with clear next steps — follow once that review is complete. Specialty assays and at-home kits take longer; each test shows its 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.