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GFR Calculator

The GFR calculator helps in measuring kidney function. Learn more on why is this important.

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Home / Health Insurance / Calculators / Articles / GFR Calculator

GFR stands for Glomerular Filtration Rate. It is a measure used to determine how well your kidneys are functioning. GFR is calculated based on a blood test that measures the level of creatinine in your blood. The test takes into account your age, gender, race, and weight. A GFR of 60 or higher is considered normal, while below 60 may indicate kidney disease. It is important to regularly monitor it to catch any potential kidney problems early on. 

This rate can be measured with a tool called GFR Calculator. In this article, you will get an overview of the GFR Calculator and its significance, along with some frequently asked questions.

Importance of GFR Calculator in measuring kidney function
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Here are some points highlighting the importance of the GFR calculator.

How does a GFR test work?
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The test involves drawing blood and measuring levels of a waste product called creatinine. This value is then plugged into an equation that takes into account factors like age, sex, and race to estimate GFR. If you're wondering about the accuracy of GFR tests, it's worth noting that they aren't perfect. 

Some people may have a different GFR than what the test indicates, so doctors may use additional tests or methods to confirm a diagnosis. However, GFR tests are still a valuable tool for monitoring kidney health and catching issues early. It's important to talk to your doctor if you have concerns about your kidney function, and to attend regular check-ups if you're at risk for kidney disease.

What do GFR results mean?
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GFR results can indicate how well your kidneys are working. If your GFR is high, it means your kidneys are filtering blood well. If it's low, your kidneys may not be functioning properly.

GFR results can be interpreted in the following way.

How do doctors compute GFR?
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Doctors use a formula that takes into account a person's age, gender, race, and serum creatinine levels to estimate the glomerular filtration rate (GFR). This formula is called the Modification of Diet in Renal Disease (MDRD) equation. 

To calculate GFR, healthcare providers order a blood test to measure a waste product called creatinine. The MDRD equation then uses this measurement, along with demographic information, to estimate the amount of blood that passes through the kidneys each minute. This information is essential in diagnosing and managing kidney disease. 

The estimated GFR is an important indicator of kidney function, as it helps doctors determine the stage of chronic kidney disease (CKD) a patient is in. If kidney disease is diagnosed, doctors may use medications and lifestyle changes to slow its progression. In severe cases, dialysis or kidney transplantation may be necessary. Regular monitoring of GFR is important to ensure optimal kidney health.

Why do I need a GFR Test?
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If you need a GFR test, it could be for one of the following reasons.

What does your GFR mean to you?
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If you have kidney disease, your doctor may have told you that your GFR is low. Here is what a low GFR means for you.

Can I reverse kidney damage?
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In some cases, kidney damage can be reversed if caught early and treated promptly. However, in many cases, kidney damage cannot be fully reversed. It is important to work with your doctor to manage your condition and prevent further damage. Some ways to slow down kidney damage include.

Frequently Asked Questions
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Listed below are some queries related to GFR and their answers.


How is GFR calculated?

GFR is calculated based on your age, gender, race, and serum creatinine level. Your doctor can also use different equations to estimate your GFR.

What is a normal GFR range?

A normal GFR range is typically between 90-120 mL/min/1.73m2, but it can vary based on individual factors.

What are some common causes of low GFR?

Some common causes of low GFR include kidney diseases or damage, diabetes, high blood pressure, and autoimmune diseases.

Can medications affect GFR?

Yes, certain medications can affect GFR. Your doctor may need to adjust your medication dosage based on your GFR levels. Some medications that can affect GFR include nonsteroidal anti-inflammatory drugs (NSAIDs), ACE inhibitors, and some antibiotics.

How often should I get my GFR checked?

The frequency of GFR checks depends on your individual health and risk factors. Your doctor can recommend an appropriate schedule for you. In general, people with kidney disease or those at risk for kidney disease should have their GFR checked regularly.

Will drinking water increase my GFR?

Drinking water can increase your GFR temporarily, but it will not have a significant impact on your kidney function in the long term.

What should I do if I have a low GFR?

If you have a low GFR, it is important to work with your doctor to determine the underlying cause and create a treatment plan. This may involve lifestyle changes, medication management, or other interventions depending on the cause of your low GFR.

Can dehydration cause low GFR?

Yes, dehydration can cause a temporary decrease in GFR. When your body is dehydrated, there is less blood flow to your kidneys, which can lead to a lower GFR.

Can I improve my GFR?

Here is a rundown of what you can do to improve your GFR.

  • Managing your blood sugar levels if you have diabetes

  • Managing your blood pressure levels

  • Quitting smoking

  • Maintaining a healthy weight

  • Eating a balanced, healthy diet

  • Staying hydrated

  • Exercising regularly

  • Taking any medications as prescribed by your doctor

Make sure to consult with your doctor to create a personalised plan to improve your GFR.

Disclaimer: The content on this page is generic and shared only for informational and explanatory purposes. It is based on industry experience and several secondary sources on the internet, and is subject to changes.