Cystatin C
Cystatin C is a clinical biomarker on the Kidneys panel, reported in mg/L. Standard reference range: 0.63–1.21 mg/L. Functional (optimal) range used by integrative practitioners: 0.5–0.9 mg/L.
What is Cystatin C?
Standard range: 18–49 years 0.63–1.03 mg/L; 50+ years 0.67–1.21 mg/L. Cystatin C is a cysteine protease inhibitor produced at a constant rate by all nucleated cells and cleared exclusively by glomerular filtration, making it a sensitive, muscle-mass-independent marker of GFR. It is increasingly used in eGFR-Cystatin C equations and is independently associated with cardiovascular risk, CKD progression, and all-cause mortality.
Reference ranges
| Range type | Value (mg/L) | Source |
|---|---|---|
| Standard (lab) | 0.63–1.21 | Typical Quest / LabCorp adult reference |
| Functional (optimal) | 0.5–0.9 | Integrative / functional medicine consensus |
How SomaVue interprets Cystatin C
SomaVue maps every result for Cystatin C against four clinical lenses — nutrient cofactors, toxin exposure, infection drivers, and circadian/hormonal context — and connects each interpretation to specific peer-reviewed citations. Pre-mapped clinical reasoning and cross-marker pattern detection are available inside the practitioner workspace.
See the full interpretation
Upload a patient PDF or enter values manually to see the four-lens analysis, cross-marker patterns, and cited evidence for Cystatin C and 205 other markers.
Try it freeEducational reference only. Reference ranges vary by laboratory, assay method, age, sex, and clinical context. Functional ranges represent integrative-medicine consensus and are not regulatory thresholds. SomaVue does not diagnose, treat, mitigate, or prevent disease. Always consult a licensed healthcare provider.