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Patient education: Cystatin C test (The Basics)

Patient education: Cystatin C test (The Basics)

What is a cystatin C test? — 

This is a blood test to check how well the kidneys are working. Cystatin C is protein that is made throughout the body. Healthy kidneys filter and break down cystatin C at a constant rate.

If your cystatin C levels are high, it might be a sign your kidneys are not working as well as they should be.

Why might I get a cystatin C test? — 

Your doctor might order this test if your results of other kidney function tests are not clear.

How do I prepare for a cystatin C test? — 

You need to get a "blood draw." Your doctor or nurse will tell you where to go for this.

It might help to wear a short-sleeve shirt to your blood draw appointment. This makes it easier for the person drawing your blood to get to your arm.

What happens during a blood draw? — 

A needle is used to take a small amount of blood from your arm (figure 1). Collecting the blood only takes a few minutes. The blood is then tested in a lab.

Tell the person who takes your blood:

●If you take "blood thinner" medicines or have a bleeding problem – They will make sure your bleeding is under control before you leave.

●If you have a latex allergy – Some of the supplies used for blood draws might contain latex.

●If you have a preferred arm to use

Most of the time, getting blood taken does not cause problems. You might have a little soreness or bruising where the needle went in.

What do my results mean? — 

Your doctor or nurse will tell you when to expect your results, and will contact you with the results. Or if you use an online "patient portal," you might get an alert there when your results are ready.

If your cystatin C test shows any abnormal results, your doctor or nurse will talk to you about what to do next. They might need to do more tests to figure out the cause.

If you do have a health problem, your doctor will work with you to come up with a treatment plan.

More on this topic

Patient education: Acute kidney injury (The Basics)
Patient education: Chronic kidney disease (The Basics)
Patient education: End-stage kidney disease (kidney failure) (The Basics)

Patient education: Chronic kidney disease (Beyond the Basics)

This topic retrieved from UpToDate on: May 11, 2025.
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