What is the eGFR Test?


What is EGFR and Why is the EGFR Test Done?

If you’ve had a recent blood test, you may have seen “EGFR” on the results, but what exactly does this mean? EGFR stands for “Estimated Glomerular Filtration Rate,” which is a measurement of how well your kidneys are functioning. The EGFR test is done to determine if you have any kidney problems or diseases, such as chronic kidney disease.

What Does EGFR Measure?

EGFR measures how much blood is being filtered through your kidneys each minute. It does this by measuring the levels of creatinine in your blood, which is a waste product produced by your muscles. Your kidneys filter creatinine out of your blood and remove it from your body through urine. If your kidneys are not functioning properly, creatinine will build up in your blood, which is why measuring creatinine levels can indicate kidney function.

How is EGFR Calculated?

EGFR is calculated using a formula that takes into account your age, gender, race, and creatinine level. The formula used is called the “Modification of Diet in Renal Disease” (MDRD) formula. This formula provides an estimate of your kidney function, which is why it’s called the “estimated” glomerular filtration rate.

What is the EGFR Normal Value Range?

The normal value range for EGFR is between 90-120 mL/min/1.73m². However, this range may vary slightly depending on your age, gender, and race. It’s important to note that a low EGFR value does not necessarily mean that you have kidney disease, but it could be an indication that further testing is needed.

Why is the EGFR Test Important?

The EGFR test is important because it can detect early signs of kidney disease. Early detection is crucial because kidney disease often has no symptoms in its early stages, and by the time symptoms appear, the disease may have already progressed. If kidney disease is detected early, steps can be taken to slow down the progression of the disease and prevent complications.

Can EGFR Deterioration Be Corrected?

If your EGFR test shows that you have kidney disease, there are steps that can be taken to slow down the progression of the disease and prevent further damage. This may include making lifestyle changes such as eating a healthy diet, getting regular exercise, quitting smoking, and controlling blood pressure and blood sugar levels. In some cases, medication or dialysis may be necessary to manage the disease.


In summary, EGFR is an important measurement of kidney function, which is done through a blood test. It can detect early signs of kidney disease, and by detecting the disease early, steps can be taken to slow down its progression and prevent complications.


  1. What causes a low EGFR value? A low EGFR value can be caused by a variety of factors, including kidney disease, dehydration, and certain medications.
  2. How often should I get an EGFR test? If you have risk factors for kidney disease, such as high blood pressure or diabetes, you should get an EGFR test at least once a year. If you don’t have any risk factors, your doctor may recommend getting the test every few years.
  3. Can EGFR be improved with diet? In some cases, making dietary changes such as reducing salt intake and increasing water intake can help improve EGFR levels. However, it’s important to work with a healthcare professional to determine the best course of action.
  1. Is EGFR the only test used to diagnose kidney disease? No, there are other tests that can be used to diagnose kidney disease, including a urine test, kidney biopsy, and imaging tests like ultrasound or CT scans.
  2. Can certain medications affect the EGFR test results? Yes, certain medications such as antibiotics, nonsteroidal anti-inflammatory drugs (NSAIDs), and some chemotherapy drugs can affect the results of the EGFR test. It’s important to inform your healthcare provider about any medications you are taking before the test.
  3. Can EGFR levels fluctuate? Yes, EGFR levels can fluctuate due to changes in your health status or certain medications. It’s important to follow up with your healthcare provider to monitor any changes in your EGFR levels.
  4. What happens if my EGFR levels are below the normal range? If your EGFR levels are below the normal range, your healthcare provider may recommend further testing to determine the cause of the low levels. Treatment options may include medication, lifestyle changes, or referral to a specialist.
  5. Is the EGFR test covered by insurance? Most insurance plans cover the EGFR test as part of routine blood work. However, it’s important to check with your insurance provider to confirm coverage and any associated costs.
  1. Are there any risks or complications associated with the EGFR test? The EGFR test is a simple blood test and generally has no risks or complications. However, as with any blood test, there is a small risk of bleeding, bruising, or infection at the site where the needle is inserted.
  2. Can dehydration affect EGFR levels? Yes, dehydration can cause a temporary decrease in EGFR levels. It’s important to drink plenty of water before the test to ensure accurate results.
  3. What should I do if my EGFR levels are abnormal? If your EGFR levels are abnormal, it’s important to follow up with your healthcare provider to determine the cause and develop a treatment plan. Depending on the underlying condition, treatment may involve medication, lifestyle changes, or referral to a specialist.
  4. How can I maintain good kidney health? To maintain good kidney health, it’s important to stay hydrated, eat a healthy diet low in sodium and saturated fats, exercise regularly, and avoid smoking and excessive alcohol consumption. It’s also important to manage any underlying conditions that can affect kidney health, such as high blood pressure or diabetes.
  5. Can EGFR levels improve over time? In some cases, EGFR levels can improve with treatment and lifestyle changes. However, the extent of improvement depends on the underlying condition and individual factors.
  6. Can kidney damage be reversed? In some cases, kidney damage can be reversed with prompt treatment and lifestyle changes. However, in more severe cases, kidney damage may be irreversible and require ongoing management.
  7. How often should I get my EGFR levels checked? The frequency of EGFR testing depends on individual factors such as age, health status, and risk factors for kidney disease. Your healthcare provider can advise on the appropriate frequency of testing based on your individual needs.

Overall, the EGFR test is an important tool for detecting early signs of kidney disease and monitoring kidney function. By understanding the purpose and significance of the test, individuals can take steps to maintain kidney health and prevent complications.

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