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Cystatin C Unit Converter
Cystatin C is a non-glycosylated protein (13.3 kDa) produced by virtually all nucleated cells in the body. It is synthesized and secreted at a constant rate and eliminated from the bloodstream almost exclusively by glomerular filtration, followed by complete reabsorption and catabolism in the renal tubules.
Because its serum concentration is highly stable (unlike creatinine, which is affected by diet, muscle mass, sex, and age), Cystatin C is considered a superior biomarker for estimating Glomerular Filtration Rate (GFR), particularly in patients with mild-to-moderate kidney disease, muscle-wasting conditions, or malnutrition. Testing is often performed in critical care or when standard creatinine-based GFR estimation is unreliable. This converter allows precise switching between the standard SI mass unit ($\text{mg/L}$) and the molar unit ($\text{nmol/L}$).
SI Units
RecommendedMilligrams per liter or Nanomoles per liter.
Conventional Units
Clinical Context
Reference Range: Serum Cystatin C levels are normally very low, typically 0.51 – 1.05 mg/L (51 – 105 nmol/L) in healthy adults, increasing with age.
Cystatin C levels show less interference from diet and inflammation compared to creatinine. It is highly valued for calculating eGFR in situations where traditional creatinine methods are known to be inaccurate, such as in patients with muscle wasting, liver disease, or extreme diets. The conversion factor relies on the molecular weight of 13.343 kDa: 1 mg/L $\approx$ 75.0 nmol/L.
Clinical References
How to Use This Calculator
Follow these steps to get accurate clinical conversions instantly.
Enter Values
Input your laboratory results into the corresponding unit field (e.g., mg/L). You can use either dot or comma decimals.
Automatic Conversion
The calculator works in real-time. As you type in one field, all other units (like nmol/L) are instantly updated.
Verify Units
Check the SI Units section. $\text{mg/L}$ is the standard SI mass unit for this test.
Reset
Use the Clear button to reset all fields before starting a new calculation.
Frequently Asked Questions & Tips
Yes. $1 \text{ mg/L}$ is exactly equal to $1 \mu\text{g/mL}$.
Cystatin C production is independent of muscle mass and diet, providing a more reliable GFR estimate in many populations (elderly, children, cancer patients).