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If you are paying out of pocket, the cystatin C blood test cost can range from about $50 for a stand-alone cystatin C with eGFR test through some self-pay lab marketplaces to $200+ when cystatin C is bundled into a broader kidney panel. The number that matters is the total cost to the patient: the posted test price plus any required physician/order fee, specimen collection fee, mobile phlebotomy fee, shipping charge, or membership fee.
Cystatin C is a blood marker used to estimate kidney filtration. It is often ordered when creatinine-based eGFR may be less reliable, such as in people with unusually high or low muscle mass, or when a clinician wants a more accurate eGFR estimate near an important decision point. Current kidney guidance increasingly favors using creatinine and cystatin C together when both results are available, rather than relying on either marker alone.
Quick Take
- Typical self-pay range: about $50–$80 for a stand-alone cystatin C with eGFR order through lower-cost marketplaces; around $200+ when included in an expanded kidney panel.
- Specimen: blood draw, usually serum. Kidney panels may also require urine.
- What you may receive: cystatin C in mg/L, cystatin C-based eGFR, or a combined creatinine-cystatin C eGFR if creatinine is measured too.
- Best cost check: compare the final checkout total, not just the advertised test price.
- Most useful context: creatinine/eGFR, urine albumin-to-creatinine ratio, urinalysis, and blood pressure history often matter more than cystatin C alone.
Self-pay cystatin C prices and ordering options
The table below summarizes common direct-to-consumer or self-pay options that were publicly listed by the providers. Prices can change, availability can vary by state and zip code, and checkout screens may add location-specific fees. This is not a ranking and should not be read as a medical recommendation to order testing.
| Provider | Relevant cystatin C option | Advertised price | Required fees and collection notes | Availability and turnaround notes |
|---|---|---|---|---|
| Own Your Labs | Cystatin C With Glomerular Filtration Rate, Estimated (eGFR) | $48.50 | Own Your Labs says all testing costs, including the blood draw fee, are covered by the amount paid at checkout when you use a participating brick-and-mortar Labcorp location. Third-party or mobile phlebotomy may cost extra. | Own Your Labs states Labcorp blood-draw orders cannot be fulfilled for residents or testing in MA, MD, NJ, NY, or RI. Its FAQ says average results take a few days, and the shop listing says overnight fasting is preferred. |
| Ulta Lab Tests | Cystatin C Test with eGFR | $67.95 | Ulta lists a standard specimen collection fee of $12.95 unless a selected location shows a higher fee, making a common effective total about $80.90 before any promotions or location-specific changes. | Ulta lists specimen type as blood, collection as blood draw, and no preparation instructions on the cystatin C page. Its FAQ says testing is not available to residents of NY, NJ, and RI and typical results are 1–3 business days, with some complex tests taking longer. |
| Quest Health | Kidney Profile Test — Expanded | $200.00 | Quest Health lists a $6 physician service fee, making the listed total $206 before optional services. Optional Quest Mobile in-home collection, where available, is listed as an additional $79. | The expanded profile includes cystatin C plus creatinine/eGFR, urine albumin/creatinine ratio, urinalysis, CBC, and CMP. Quest lists blood and urine collection, age 18–100, 3–5 business day results for the expanded profile, and state/location restrictions at checkout. |
| Labcorp OnDemand | Kidney Health Test | $109.00 | Labcorp OnDemand states one transparent price for its OnDemand tests and in-person collection at a Labcorp location. | This consumer kidney test includes creatinine, creatinine-based eGFR, urine albumin, and albumin-creatinine ratio, but the public OnDemand product page does not list cystatin C. Labcorp’s professional test menu supports cystatin C when ordered through appropriate clinical channels. |
| HealthLabs | Testosteronology – Kidney Function panel | $203.00 | HealthLabs states that the price you see is the price you pay, with no shipping, taxes, or additional charges for the testing-center visit and results. | The panel includes cystatin C, CMP, and random urine albumin with creatinine ratio. HealthLabs lists 8-hour fasting for this panel and typical results in 1–3 business days. |
Why cystatin C pricing varies so much
A cystatin C price can look confusing because sellers are not always offering the same thing. One order may be a single cystatin C with eGFR assay. Another may be an expanded kidney panel that includes blood and urine markers. A third may be a physician-ordered Labcorp or Quest test billed through insurance or through a clinic’s cash-pay rate.
The biggest price drivers are:
- Stand-alone test versus panel: a single cystatin C with eGFR usually costs less than a panel that also includes CMP, CBC, urinalysis, and urine albumin-to-creatinine ratio.
- Order authorization: direct-access companies usually build clinician authorization into the order process, but some display it as a separate physician service fee.
- Specimen collection: some providers include the standard blood draw in the checkout price, while others add a draw fee after you choose a collection site.
- Lab network: some orders are performed through Quest, some through Labcorp, and some through referral laboratories.
- Mobile collection: in-home phlebotomy is convenient but often adds a separate fee.
- Promotions: some marketplaces advertise list price, sale price, coupon price, or subscription-linked discounts. Compare the final checkout total.
What the cystatin C test measures
Cystatin C is a small protein made by nucleated cells throughout the body. It is filtered from the blood by the glomeruli, the kidney’s filtering units. Mayo Clinic Laboratories describes cystatin C as a marker whose blood concentration is inversely related to glomerular filtration rate: when kidney filtration decreases, cystatin C tends to rise. The same Mayo test catalog lists serum as the specimen type and immunoturbidimetric testing as the method for its cystatin C with eGFR assay.
Many reports include both the cystatin C value and an estimated glomerular filtration rate, or eGFR. The eGFR is not a direct measurement of kidney filtration. It is a calculation based on a lab-measured marker and demographic variables used by the equation. The NIDDK explains that eGFR estimates can differ from measured GFR and are best interpreted with the clinical picture and trends over time.
Cystatin C vs creatinine: why order one when creatinine is cheaper?
Creatinine is still the workhorse kidney filtration marker. It is inexpensive, widely available, and included in common panels such as the basic metabolic panel and comprehensive metabolic panel. Most routine eGFR results are calculated from serum creatinine.
The limitation is that creatinine is partly a muscle-related waste product. Creatinine-based eGFR can be misleading when a person’s creatinine production is unusually high or low because of muscle mass, diet, supplements, frailty, amputation, spinal cord injury, or other factors. The NIDDK notes that creatinine measurement alone may give an incomplete picture in some patients and that serum or plasma cystatin C may be used when creatinine-based estimation is problematic.
Cystatin C is often less influenced by muscle mass than creatinine, which is why it can be helpful in certain situations. But cystatin C is not free from confounding. NIDDK lists steroid use, thyroid dysfunction, adiposity, and inflammation as factors that can raise cystatin C independent of GFR. The KDIGO 2024 CKD executive summary also discusses clinical settings where creatinine, cystatin C, or combined equations may be more or less accurate.
That is the main reason combined eGFR is attractive. Creatinine and cystatin C have different weaknesses. When both are measured, the combined creatinine-cystatin C equation often provides a more accurate estimate than either marker alone. NIDDK states that if both serum creatinine and serum cystatin C are measured, laboratories should use the combined creatinine-cystatin C equation.
What eGFR adds to the cystatin C result
A cystatin C number by itself is useful, but eGFR translates that marker into an estimated filtration rate reported as mL/min/1.73 m². Many patients are more familiar with eGFR because it is used in CKD staging and medication-related discussions.
Two people can have the same cystatin C value but different eGFR estimates depending on age, sex, and the equation used. That is why the equation matters. The National Kidney Foundation’s professional eGFR calculator supports creatinine-only, cystatin C-only, and combined creatinine-cystatin C estimates, and notes that these equations are valid only with standardized assays.
For consumers comparing tests, look for wording such as “Cystatin C with eGFR,” “Cystatin C With Glomerular Filtration Rate, Estimated,” or “eGFR creatinine-cystatin C.” A plain “Cystatin C” order may report only the cystatin C concentration, depending on the lab and ordering system.
Specimen, preparation, and collection details
Cystatin C is a blood test. In laboratory catalogs, the preferred specimen is commonly serum collected in a serum separator or red-top tube. Mayo Clinic Laboratories lists serum gel as preferred, red top as acceptable, a 0.5 mL specimen volume, and centrifugation within 2 hours for its cystatin C with eGFR test. Labcorp’s January 2025 diagnostic update listed serum as preferred or plasma as acceptable for its cystatin C test, with a 1 mL volume and gel-barrier or green-top heparin tube collection.
For the patient, this usually means a standard venipuncture at a patient service center. If the cystatin C test is part of a kidney panel, you may also be asked to provide a urine sample for albumin, urine creatinine, albumin-to-creatinine ratio, or urinalysis.
Preparation depends on the exact order:
- Stand-alone cystatin C with eGFR: many listings state no special preparation, although some platforms prefer fasting.
- Kidney panels: fasting may be required because the panel includes CMP, glucose, lipids, or other markers affected by food intake.
- Exercise: some kidney profile instructions advise avoiding vigorous exercise for 24 hours before collection, especially when urine albumin or creatinine-based markers are included.
- Medications: do not stop prescribed medications just to “improve” a lab result unless your clinician specifically tells you to. Steroids, thyroid disease, and other conditions may be relevant to interpretation, so they are worth discussing when results are reviewed.
How to read common result patterns
Cystatin C interpretation should be cautious. A lab result can support a kidney evaluation, but it does not diagnose the cause of kidney disease by itself.
High cystatin C with low cystatin C eGFR
A higher cystatin C level usually corresponds to a lower estimated filtration rate. This can be seen when kidney filtration is reduced, but it can also be influenced by non-GFR factors such as glucocorticoid exposure, thyroid dysfunction, adiposity, inflammation, smoking, severe illness, or certain cancer-related contexts. Clinicians usually interpret this pattern with creatinine, urine albumin-to-creatinine ratio, urinalysis, blood pressure, medications, and prior results.
Creatinine eGFR and cystatin C eGFR are similar
When creatinine-based and cystatin C-based estimates point in the same direction, clinicians may have more confidence that the eGFR category reflects kidney filtration. This is especially useful when results are near a threshold that could affect medication dosing, imaging contrast decisions, kidney referral, or CKD staging.
Creatinine eGFR is low, but cystatin C eGFR is higher
This can happen when creatinine is elevated for reasons partly unrelated to kidney filtration, such as higher muscle mass, heavy resistance training, creatine supplementation, high meat intake close to testing, or reduced tubular secretion from some medications. It does not prove kidneys are normal, but it gives a clinician a reason to look at the broader picture before labeling a person’s kidney function based only on creatinine.
Cystatin C eGFR is low, but creatinine eGFR is higher
This pattern may occur when creatinine is low because of low muscle mass or malnutrition, or when cystatin C is raised by non-GFR factors such as inflammation, steroid use, thyroid dysfunction, adiposity, or smoking. Combined creatinine-cystatin C eGFR may help, but in high-stakes decisions a clinician may consider measured GFR or repeat testing.
When a bundled kidney panel may be worth the higher price
A stand-alone cystatin C with eGFR test can be cost-effective if you already have recent creatinine, urine albumin-to-creatinine ratio, and urinalysis results. If you do not, a panel may provide better context.
Kidney evaluation is not only about filtration. It also asks whether there is evidence of kidney damage. The National Kidney Foundation states that CKD is defined by abnormalities of kidney structure or function present for more than 3 months, and that albuminuria is one of the key markers. NKF also notes that an eGFR below 60 for 3 months or more, or eGFR above 60 with kidney damage such as albumin in the urine, can indicate CKD.
That is why many kidney panels include urine albumin-to-creatinine ratio, often abbreviated uACR or ACR. ACR can detect albumin leakage that may not be obvious on a routine blood panel. A CMP can add electrolytes, calcium, albumin, liver markers, BUN, and creatinine. A urinalysis can add information about protein, blood, glucose, ketones, cells, and signs of urinary tract inflammation. A CBC can help identify anemia or inflammation patterns that may matter in a broader health evaluation.
The tradeoff is cost and complexity. More markers can be useful, but they also increase the number of results that may need professional interpretation.
How to choose where to order
Start with the medical question. If the purpose is to clarify an unexpected creatinine-based eGFR result, a cystatin C with eGFR order may be enough to discuss with your clinician. If the purpose is a broader kidney screen, a panel that includes urine ACR may be more informative than cystatin C alone.
Then compare the practical details:
- Total cost: add the test price, physician/order fee, blood draw fee, mobile collection fee, and any membership or shipping cost.
- Panel contents: confirm whether the order includes cystatin C only, cystatin C with eGFR, creatinine, combined eGFR, uACR, CMP, CBC, or urinalysis.
- Specimen: know whether you need blood only or blood plus urine.
- Preparation: follow the requisition, especially if the panel includes fasting markers.
- State restrictions: direct-access testing rules vary. Some providers exclude NY, NJ, RI, MD, MA, AZ, HI, or PR depending on their lab network and product.
- Results access: check whether results go to the provider portal, Quest/MyQuest, Labcorp Patient, or another account.
- Clinical review: understand what type of result support is included and when you should bring results to your own healthcare professional.
If you have symptoms such as swelling, shortness of breath, chest pain, confusion, severe weakness, greatly reduced urination, blood in urine, or very high blood pressure, self-ordering a lab is not a substitute for timely medical care.
Frequently asked questions
How much does a cystatin C blood test cost without insurance?
Self-pay cystatin C testing commonly ranges from about $50 to more than $200 depending on whether you buy a stand-alone cystatin C with eGFR test or a larger kidney panel. The effective cost depends on the advertised test price plus any physician/order fee, blood draw fee, mobile collection fee, shipping charge, or membership requirement.
Is cystatin C better than creatinine?
Cystatin C is not simply better in every situation. Creatinine is inexpensive and widely used, but it can be affected by muscle mass, diet, and some medications. Cystatin C is less affected by muscle mass, but it can be affected by steroid use, thyroid dysfunction, adiposity, and inflammation. Many guidelines favor using creatinine and cystatin C together when a more accurate eGFR estimate is needed.
Do I need to fast before a cystatin C blood test?
Many cystatin C with eGFR tests list no special preparation, but some ordering platforms or bundled panels may prefer or require fasting because other markers are included. Follow the instructions on the requisition for the exact test or panel you purchase.
What specimen is used for cystatin C?
Cystatin C is usually measured from a blood sample, most often serum. Bundled kidney panels may also require a urine sample for albumin, urine creatinine, albumin-to-creatinine ratio, or urinalysis.
Why is a cystatin C test more expensive than creatinine?
Creatinine is a high-volume routine chemistry test included in many common panels. Cystatin C is a less common immunoassay and may be performed at a referral laboratory, which can raise the self-pay price and turnaround time.
Should I order cystatin C alone or as part of a kidney panel?
A stand-alone cystatin C with eGFR test may be enough if you already have recent creatinine and urine albumin results. A kidney panel may be more useful when you want cystatin C interpreted with creatinine-based eGFR, urine albumin-to-creatinine ratio, urinalysis, or a CMP. A clinician can help decide which combination fits the medical question.
Practical next steps
- Decide what you are trying to clarify: a creatinine discrepancy, a broader kidney screen, or follow-up to a clinician’s plan.
- Compare final checkout totals: include draw fees, physician/order fees, mobile collection fees, and state restrictions.
- Check panel contents: make sure the order actually includes cystatin C and the eGFR calculation you want.
- Bring prior results: cystatin C is most useful when compared with creatinine, urine ACR, urinalysis, blood pressure, medications, and trends over time.
- Review abnormal results with a healthcare professional: kidney lab patterns often require repeat testing and clinical context before conclusions are made.
Use the CTX Stat nationwide comparison tool to review self-pay prices across major laboratory testing providers.
