Cystatin C
Kidney blood
What It Is
Cystatin C is a protein produced by all nucleated cells and filtered by the kidneys.
Why It Matters
Cystatin C provides an alternative estimate of kidney function, less affected by muscle mass than creatinine.
If Levels Are High
Elevated cystatin C suggests reduced kidney filtration capacity.
If Levels Are Low
Low levels are generally not clinically significant.
Preparation
No special preparation required.
How Often to Test
As clinically indicated, particularly when creatinine may be unreliable.
Panels Including This Marker
Test Your Cystatin C Levels
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Important Disclaimer
This information is for educational purposes only and does not constitute medical advice or diagnosis. Results should be interpreted in clinical context by a qualified healthcare professional. If you have severe symptoms or urgent concerns, seek urgent medical help.