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Quest / Kidney Function
Cystatin C with Glomerular Filtration Rate, Estimated...
This test measures cystatin C, a protein filtered by the kidneys, and uses it to estimate glomerular filtration rate (eGFR) - a key marker of kidney function. Unlike creatinine, cystatin C is less affected by muscle mass, making it a reliable alternative for...
Coming Soon
What this lab measures
This test measures cystatin C, a protein filtered by the kidneys, and uses it to estimate glomerular filtration rate (eGFR) - a key marker of kidney function. Unlike creatinine, cystatin C is less affected by muscle mass, making it a reliable alternative for...
How testing works
Order online
Choose your marker and add a brief medical history so your result has context from the first draw.
Visit a partner lab
Take your order to a certified Quest location for a short blood draw.
Clinician review
A licensed clinician reviews your result and shares clear interpretation with next steps.
FAQ
After ordering, visit a certified Quest partner location for a short blood draw. No insurance is required.
Feelrx / Start here
Know your baseline.
Order a panel online, draw at a certified partner lab, and receive a clear clinician review.
Coming Soon