Glomerular Filtration Rate (GFR) Test

The Glomerular Filtration Rate (GFR) test is a measure of how well the kidneys are functioning. It measures the amount of a particular protein, creatinine, which is filtered out of the body by the kidneys. A low GFR score may indicate an existing or potential kidney problem.

Preparations for GFR Test

Before having the Glomerular Filtration Rate Test, there are some preparations that should be made. These include:

Drink plenty of water prior to the test.
Tell the doctor if any medications are being taken, as some medications can interfere with the test.
Obtain a list of any dietary restrictions, such as not eating several hours before the test.

Procedure for GFR Test

The Glomerular Filtration Rate Test is relatively simple and can be completed in a matter of minutes. The procedure involves a physician collecting a sample of the patient’s blood, which is then sent to a laboratory for analysis. Once the results are received, they can be used to determine the patient’s GFR score.

Types of GFR Test

There are two main types of GFR tests, the serum creatinine test and the cystatin C test. Both tests measure the amount of creatinine in the blood, but the serum creatinine test measures total creatinine and the cystatin C test measures filtered creatinine. A physician will often use both tests in order to get a more accurate assessment.

Risks of GFR Test

The Glomerular Filtration Rate Test is considered a safe and routine procedure, and there are no known risks associated with it. The only potential risk is a slight discomfort during the blood draw procedure.

Why Have a GFR Test

A Glomerular Filtration Rate Test is used to assess the kidneys’ ability to filter waste products from the blood. Health care providers may use the test to evaluate the risk of kidney disease, diagnose kidney disease, and monitor the progression of kidney disease. A GFR test can also be used to assess the effectiveness of treatments for existing kidney disease.

When to Have a GFR Test

A Glomerular Filtration Rate Test is typically recommended when a person is at a higher risk for kidney disease, such as those with diabetes, hypertension, a family history of kidney disease, or a history of kidney disease. It can also be beneficial to have a GFR test to monitor the progress of existing kidney disease or to asses the effectiveness of treatments.