--- title: eGFR (Cystatin C) Test type: biomarker url: "https://www.test-well.com/biomarkers/egfr-cystatin-c" also_known_as: - egfr (cystatin c-based) - egfr cystatin c - egfr cys c - estimated gfr cystatin c category: Metabolic Health units: - mL/min/1.73m2 - mL/min order_price_usd: 23.99 order_item: Renal Panel order_url: "https://www.test-well.com/tests/renal-panel" reviewed_at: 2026-09-05 --- # eGFR (Cystatin C) > eGFR (Cystatin C) is measured with a standard blood draw; no fasting is needed. A typical reference range is 60.0 – 120 mL/min/1.73m2. At TestWell it's $23.99 all-in as Renal Panel, results in 2–4 business days, drawn at Quest or Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis. Also known as: egfr (cystatin c-based), egfr cystatin c, egfr cys c, estimated gfr cystatin c. ## Key facts | Fact | Value | | --- | --- | | Units | mL/min/1.73m2 / mL/min | | Sample | Blood draw | | Fasting | Not required | | Results | 2–4 business days | | Price | $23.99 | | Labs | Quest or Labcorp | ## What does eGFR (Cystatin C) measure? Estimated kidney filtration rate calculated from cystatin C. Often used to confirm creatinine-based eGFR. ## What is the normal range for eGFR (Cystatin C)? | Population | Reference range | | --- | --- | | age 18+ | 60.0 – 120 mL/min/1.73m2 | Reference intervals differ slightly between labs; the range printed on your report is the one to interpret against. Ranges are usually set so 95% of healthy people fall inside them. ## What does a low eGFR (Cystatin C) mean? Sustained values below 60 can indicate chronic kidney disease. ## How do you get tested for eGFR (Cystatin C)? | Order | Type | Price | Includes | | --- | --- | --- | --- | | [Renal Panel](https://www.test-well.com/tests/renal-panel) | Single test | $23.99 | This marker | | [Kidney Health Panel](https://www.test-well.com/tests/kidney-health-panel) | Panel | $64.99 | 4 tests | | [Total Body Panel](https://www.test-well.com/tests/total-body-panel) | Panel | $499.99 | 49 tests | ## Quest vs Labcorp vs BioReference | Lab | Available | Price | Notes | | --- | --- | --- | --- | | Quest Diagnostics | Yes | $23.99 | Choose Quest at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. | | Labcorp | Yes | $23.99 | Choose Labcorp at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. | | BioReference (NY & NJ) | No | — | Not available in NY/NJ for this test. | - [What a low eGFR (Cystatin C) means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/egfr-cystatin-c/low) ## Common questions about eGFR (Cystatin C) ### Do I need a doctor's order to test my egfr (cystatin c)? No. TestWell's licensed physician network reviews and approves your order — usually within minutes. You can place an order online without an in-person visit or a referral from your own doctor. ### How long does it take to get eGFR (Cystatin C) results? Most eGFR (Cystatin C) results are available in 1–3 business days after your specimen arrives at the lab. You'll get an email the moment your results are ready, with everything viewable in your TestWell portal. ### How much does a eGFR (Cystatin C) test cost? Our Renal Panel starts at $23.99. That's the all-in price — no copays, no insurance hoops, no surprise bills. HSA and FSA cards are accepted. ### Do I need to fast before my eGFR (Cystatin C) test? Fasting is not required for the eGFR (Cystatin C) test. You can have your blood drawn any time of day. ### Which lab will process my eGFR (Cystatin C) test? Your test will be processed by Quest Diagnostics, Labcorp, or BioReference depending on which is closest to you and which lab carries the test. All three are CLIA-certified and trusted by hospitals nationwide. You'll choose your lab during checkout from 4,000+ locations. ## Sources - [National Kidney Foundation](https://www.kidney.org/atoz/content/gfr) - [Testing.com (AACC) — Cystatin C Test: What It Measures and How It Works](https://www.testing.com/tests/cystatin-c/) ## Related biomarkers - [Glucose](https://www.test-well.com/biomarkers/glucose) - [Creatinine](https://www.test-well.com/biomarkers/creatinine) - [eGFR](https://www.test-well.com/biomarkers/egfr) - [BUN](https://www.test-well.com/biomarkers/bun) - [ALT](https://www.test-well.com/biomarkers/alt) - [AST](https://www.test-well.com/biomarkers/ast) - [Reference range lookup tool](https://www.test-well.com/tools/reference-range-lookup) - [Lab unit converter](https://www.test-well.com/tools/lab-unit-converter) - [All biomarkers](https://www.test-well.com/biomarkers) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-05. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/biomarkers/egfr-cystatin-c Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.