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Cystatin C blood test
A high creatinine result can be difficult to interpret when you lift regularly, have substantial muscle mass or use creatine. Add another filtration marker to the conversation.
Your results are reviewed with the health information you share.
Included in your package price. Choose an available Quest location.
See the complete package contents before you order.
Understand your testing options
Cystatin C and creatinine: why check both?
Cystatin C can add useful information when a creatinine-based kidney estimate is difficult to interpret. Muscle-related factors can affect creatinine. Your clinician can compare the two markers with your health history and earlier results.
Cystatin C and eGFR
This package includes serum cystatin C and the listed estimated filtration results. Your clinician uses them to add context to kidney function.
Creatinine and a CMP
The comprehensive metabolic panel includes creatinine, electrolytes and other measurements. See the complete list below to compare it with your clinician’s request.
Useful background
Share your exercise routine, creatine use, medicines, thyroid history and previous kidney results. These details help your clinician interpret the measurements together.
The complete package is $100 with Quest collection included. It also includes a CBC with differential. A price for cystatin C alone covers a different set of tests, so compare the complete contents before ordering.
Know what you are buying
What is included?
- Cystatin C, serum + estimated GFR
- CMP, including creatinine and electrolytes
- Complete blood count with differential
Add cystatin C and filtration estimates to metabolic and blood-count results when your clinician wants more context for kidney function.
All 53 included biomarkers and results
Exact package list. Includes calculated results and blood-count components; the marker count is different from the number of test panels ordered. Some differential components are reported only when indicated by the lab.
- Glucose (Blood)
- Creatinine
- Estimated Glomerular Filtration Rate
- Cystatin C, Serum
- Estimated GFR
- BUN/Creatinine Ratio
- Calcium
- Blood Urea Nitrogen
- Carbon Dioxide
- Chloride
- Potassium
- Sodium
- Albumin/Globulin Ratio
- Total Bilirubin
- Globulin (Calculated)
- Alkaline Phosphatase (ALP)
- Albumin
- Aspartate Aminotransferase (AST)
- Alanine Aminotransferase (ALT)
- Protein, Total
- Red Cell Distribution Width (RDW)
- Neutrophils (%)
- Monocytes (%)
- Lymphocytes (%)
- Eosinophils (%)
- Basophils (%)
- Platelet Count
- Mean Corpuscular Hemoglobin Concentration (MCHC)
- Mean Corpuscular Hemoglobin (MCH)
- Mean Corpuscular Volume
- Hematocrit
- Hemoglobin (HGB)
- Band Neutrophils
- Blasts
- Metamyelocytes
- Myelocytes
- Nucleated RBC
- Promyelocytes
- Band Neutrophils (%)
- Basophils
- Blasts (%)
- Eosinophils
- Lymphocytes
- Metamyelocytes (%)
- Monocytes
- Myelocytes (%)
- Neutrophils
- Nucleated RBC (%)
- Promyelocytes (%)
- Reactive Lymphocytes
- Mean Platelet Volume (MPV)
- White Blood Cell Count (WBC)
- Red Blood Cell Count (RBC)
Cystatin C test cost: $100 with collection included
The package price is $100, including Quest collection. There is no separate Quest collection fee. Choose an available Quest location using the instructions in your account.
This price covers cystatin C, the listed filtration estimates, a CMP and a CBC with differential. Collection at an available Quest location is included.
This lab package is HSA/FSA eligible and is offered as cash-pay testing. Confirm your collection choice, eligibility and final amount during ordering.
Before your blood draw
Share creatine use, muscle-building supplements, medicines, thyroid history and previous kidney results. Follow the collection and fasting instructions supplied for the package.
Availability depends on your location. Review the options shown for your address before paying. Results timing varies by test and collection date.
From order to interpretation
How it works
01 · Order your package
Continue through New Approach Health’s store and complete your health questionnaire.
02 · Arrange your draw
Follow the collection and preparation instructions in your account.
03 · Review your results
Your provider reviews the results and shares your wellness plan and next steps.
A more informed choice
Your questions,
answered.
What does a cystatin C test measure?
Cystatin C is a protein filtered by the kidneys. Its blood level can be used to estimate kidney filtration, providing another perspective alongside a creatinine-based estimate. Your provider interprets the result with your history and other kidney tests.
Why might it help when creatinine is high?
Creatinine is influenced by muscle-related factors. A cystatin C result may be useful when a creatinine-based estimate is unclear, including in some people with high muscle mass. It is not completely independent of other influences: thyroid conditions and steroid use can also matter.
Does this tell me whether creatine is safe for me?
The package supplies additional lab information; it does not automatically clear a supplement for use. Share the exact supplement, dose, medicines and prior results with your clinician before changing protein intake or continuing a supplement after an abnormal result.
How much does this cystatin C package cost?
The package is $100 and includes the listed cystatin C, filtration estimates, CMP and CBC results. Quest collection is included in the $100 price. Choose an available Quest location during ordering.
What other information helps with a kidney review?
Bring recent kidney results, medicines and supplements to your clinician. They may also recommend a urine albumin-to-creatinine ratio as part of a kidney evaluation.
Compare related options
Compare the included tests and choose the package that fits your question. Some packages share tests.
Information from New Approach Health. Prices and included markers checked November 7, 2026. Testing guide updated November 8, 2026.
Further reading: National Kidney Foundation: cystatin CNational Kidney Foundation: kidney tests