Cystatin C, Serum Concentration

Why Is This Test Done?

Your doctor may order a cystatin C test to check how well your kidneys are working. It can be useful for monitoring kidney function, especially in people with conditions like diabetes or high blood pressure that can affect the kidneys. Cystatin C is also sometimes used alongside other tests to help determine if you have kidney disease or to guide treatment decisions.

How Is the Sample Collected?

A blood sample is taken from a vein, usually in your arm. You may feel a small pinch when the needle is inserted, but the procedure is quick. The blood is collected in a special tube and sent to the lab for testing.

What Do the Results Mean?

Higher than expected levels of cystatin C may indicate kidney problems or other health conditions. Lower levels might suggest kidney function is better than expected. Your doctor will interpret your results in the context of your overall health and other tests.

Common Conditions Monitored

Cystatin C is often used alongside creatinine tests to assess kidney function. It can help detect early signs of kidney disease, especially in people who don’t have symptoms yet. It’s also useful for monitoring kidney function in people with chronic conditions like diabetes or heart disease.