Kidneys
What is Cystatin C?
a more precise kidney measure
- Unit
- mg/L
- Sample
- Serum
- Fasting
- No fasting needed
- Turnaround
- 2 days
Cystatin C is a protein that kidneys filter at a steady rate. It is a more precise measure of kidney function than creatinine because it is not affected by muscle mass.
The value is especially useful in older adults, in people with extreme muscle mass (athletes or frail), and in early kidney function decline.
What does low Cystatin C mean?
Low values are favourable.
What does high Cystatin C mean?
High cystatin C reflects reduced kidney function.
Panels that measure Cystatin C
- Kidney Test
- Health Check Plus
- Performance Test Complete
- Health Check Complete
- Health Check Man
- Health Check Kvinna
More markers in the same area
Launching in Stockholm in 2026.
Want to know when you can order?
This is general information about the marker, not an assessment of your values and not medical advice. Last updated: August 2026.