Cystatin C-Based Glomerular Filtration Rate (GFR) with Liver Function Confirmation

Why This Test Is Done

Doctors may order this test if you have symptoms of kidney problems (like fatigue, swelling, or frequent urination) or if you have liver issues (like jaundice, itching, or abdominal pain). It’s also used to monitor kidney disease progression or liver conditions that affect kidney function, such as chronic liver disease.

What to Expect Before the Test

No special preparation is needed. You’ll provide a small blood sample, usually drawn from your arm. If a urine sample is involved, you may be asked to collect it at home or in the lab. Avoid heavy meals before the test if instructed by your provider.

How the Test Works

The blood sample is tested for cystatin C, a protein that reflects kidney function. Liver function tests may include checking levels of enzymes or substances that indicate liver health. The results help determine how well your kidneys filter waste and how your liver processes toxins.

What the Results Mean

Results show your estimated glomerular filtration rate (GFR) based on cystatin C levels, along with liver test results. Lower GFR values suggest impaired kidney function, while abnormal liver test results may indicate liver damage or disease. Your doctor will interpret these results in the context of your overall health.