Cystatin C, Serum Concentration

Why Is This Test Done?

Your healthcare provider may order a cystatin C test to check how well your kidneys are working. It can help detect early kidney problems, especially in people with diabetes, high blood pressure, or a family history of kidney disease. Some doctors also use it to monitor kidney function in patients on certain medications or with chronic conditions.

How Is the Test Performed?

A small blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it is analyzed to measure cystatin C levels. This process is quick and typically done in a doctor’s office or clinic.

What Do Results Mean?

Results are not provided with specific numeric ranges on this site. Your healthcare provider will interpret the results in relation to your overall health and medical history. Higher than expected levels may indicate kidney problems, while lower levels might suggest other conditions that need further evaluation.

Common Reasons for Testing

Cystatin C is often used alongside other tests, such as creatinine, to get a more accurate picture of kidney function. It can be particularly useful in people who have kidney disease risk factors or those who need precise monitoring of kidney health over time.