Also known as: Cystatin C with eGFR, Cystatin C Kidney Function Test
Hospital Lab
$180
cash pay
Other Labs
$60
+ lab fees
TestWell
$36.99
+ $6 lab fee
Cystatin C is a protein produced at a constant rate by all cells in the body and filtered by the kidneys. Unlike creatinine, it's not significantly affected by muscle mass, diet, age, or gender, making it a more accurate marker of kidney function in many populations including the elderly, athletes, and those with very high or low muscle mass. The eGFR calculated from cystatin C is increasingly recommended as a complementary or alternative measure to creatinine-based eGFR.
Kidney and urinary testing evaluates how well your kidneys filter waste, balance electrolytes, and detect early signs of kidney damage from diabetes, hypertension, or medications.
Anyone with diabetes, high blood pressure, family history of kidney disease, or taking long-term NSAIDs or other kidney-impacting medications.
Sample Type
Blood draw
Fasting
Not required
Results In
2–4 business days
Performed At
Quest or Labcorp
Your Kidney Function Test (Cystatin C) results will include values for each of the 2 biomarkers tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 2–4 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you.
Your Kidney Function Test (Cystatin C) results will include values for each of the 2 biomarkers tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 2–4 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you.
No fasting required.
No fasting required.
TestWell Price
$36.99
+ $6 lab processing fee at checkout
No insurance needed · HIPAA compliant
Better value: the Kidney Health Panel
Save $36.97This test is part of the Kidney Health Panel — 4 tests · 36 biomarkers for $64.99, $36.97 less than à la carte.
$64.99$101.96
4 tests · 36 biomarkers
Frequently ordered together
Customers who ordered Kidney Function Test (Cystatin C) also added these for a more complete health picture.
Not sure where to start?
Kidney Function Test (Cystatin C)
$36.99