Cystatin C testing
What is analysed?
Cystatin C analysis involves measuring the concentration of cystatin C in the blood to assess kidney function.
What does the result mean?
The result indicates the level of cystatin C in the bloodstream, which reflects the glomerular filtration rate (GFR) and provides an estimate of kidney function.
Why undergo the analysis?
Cystatin C analysis is performed to evaluate kidney function, particularly in patients with suspected or known kidney disease, or to monitor renal function over time.
When to undergo the analysis?
Cystatin C analysis may be recommended as part of routine kidney function assessment or when there are concerns about kidney health.
What sample is required?
A blood sample is required for cystatin C analysis.
Is any prior preparation necessary?
No specific preparation is usually necessary before cystatin C analysis. Patients should follow any instructions provided by their healthcare provider.
How is it used?
Cystatin C levels are used to estimate GFR and assess kidney function independently of factors that may affect serum creatinine levels.
What are the normal values?
Normal cystatin C levels typically range between 0.53 and 0.95 mg/L. However, reference ranges may vary depending on the laboratory method used.
Cystatin C levels reference table
| Cystatin C Level (mg/L) | Interpretation |
| Less than 0.95 | Generally considered within normal range |
| 0.95 or higher | May indicate impaired kidney function |
This table provides a simplified interpretation of cystatin C levels, aiding healthcare professionals in assessing kidney function and diagnosing kidney-related conditions.
What do altered values signify?
Elevated cystatin C levels may indicate impaired kidney function or decreased GFR, suggesting underlying kidney disease or dysfunction.