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What Does Gfr In Blood Test Mean

Meaning Of Normal Gfr

What does a low eGFR mean in a typical blood test? – Online interview

It means the percentage of normal kidney function which is an estimate of remaining kidney function.When GFR is 100 milliliters per minute it means you have 100% kidney function, while GFR of 30 mL/min means your kidney function is reduced to 30% of its ability of creatinine clearance.As the chronic kidney disease progresses the GFR decreases.When GFR is less than 15 mL/min it means you lost about 90 to 85 percent of kidney function and developed end stage kidney disease that need dialysis to take wastes of the body out.Normal GFR range means normal kidney function while low GFR level means that your kidney function is low.

What Does My Egfr Mean

A normal eGFR is 60 or more. If your eGFR is less than 60 for three months or more, your kidneys may not be working well. Use this chart to see what your eGFR may mean.


Talk to your doctor about ways you can slow down the damage to your kidneys. Talk to your doctor about ways you can slow down the damage to your kidneys. If your eGFR was 60 or less, talk to your doctor right away! Ask when you should be tested again.If this was your first eGFR test, you may need to be tested again in a few months. Your doctor will want to see if your eGFR is 60 or less for three months or more. If your eGFR was 60 or less, talk to your doctor right away! Ask when you should be tested again.If this was your first eGFR test, you may need to be tested again in a few months. Your doctor will want to see if your eGFR is 60 or less for three months or more. If your eGFR was 60 or less, talk to your doctor right away! Ask when you should be tested again.If this was your first eGFR test, you may need to be tested again in a few months. Your doctor will want to see if your eGFR is 60 or less for three months or more. If your eGFR was 60 or less, talk to your doctor right away! Ask when you should be tested again.If this was your first eGFR test, you may need to be tested again in a few months. Your doctor will want to see if your eGFR is 60 or less for three months or more.

No matter what your eGFR is, take these steps to keep your kidneys as healthy as possible:

Why Knowing Your Gfr Matters

Your eGFR is an important calculation that helps your doctor determine your level of kidney function. This can mean something different for everybody, since your eGFR also depends on your age, gender, muscle mass, ethnicity, and the results of your creatinine serum test. If your doctor is using eGFR to help diagnose kidney disease or determine your stage, you may also need additional tests to confirm.

Knowing your eGFR and understanding which stage youre in can help you take steps to preserve kidney function and track any progression.

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Why Are There Different Egfr Numbers For Black And Non

Your test report may show two eGFR numbers, one for Black people and one for those who are not Black. People of African ancestry have a higher eGFR. They produce more creatinine and have more muscle mass than non-Black people. The lab doesnt know your ethnicity or race, so the report includes both numbers.

What Are Good Gfr And Creatinine Numbers

Chronic Kidney Disease (CKD)

GFR and creatinine are usually measured and reported together. GFR is the best measure of kidney function, but creatinine can also be a helpful indicator of your kidney health. It’s a bad sign if your GFR goes down or your creatinine goes up. In general, a “good” GFR number is above 60, and a “good” creatinine number is below 1.2.

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How Do Doctors Identify Kidney Problems

Lab test results to check for kidney disease:Measuring the level of serum creatinine in your blood: to estimate glomerular filtration rate , as GFR helps to identify which stage of the disease your kidneys are reached.Urine test for protein in urine: Proteinuria is a sign of mild kidney damage even if the GFR is about 90.Normal blood pressure level represents normal selective ion exchange by kidney system.Recommendations:Here some tips of what to do if you have abnormal GFR test results?Repeat Creatinine, GFR and Urine tests periodically even if the numbers are normal, especially if you from those at risk to develop kidney disease.Early detection and identification of kidney problems lead to early treatments and close prevention of worsening the disease.You can search by zip code for the local Kidney early evaluation Program screenings at:

How Should I Prepare For A Serum Creatinine Blood Test

The serum creatine blood test is highly sensitive. Follow your healthcare providers guidelines to prepare for the blood test. You may need to fast for a time before the test. You may also need to stop taking certain medications.

Your provider may also advise that you not eat cooked meat the day before the test. Some studies show that eating meat raises creatinine levels temporarily.

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Why The Test Is Performed

The GFR test measures how well your kidneys are filtering the blood. Your doctor may order this test if there are signs that your kidneys are not working well. It may also be done to see how far kidney disease has progressed.

The GFR test is recommended for people with chronic kidney disease. It is also recommended for persons who may develop kidney disease due to:

  • Family history of kidney disease
  • Frequent urinary tract infections
  • Urinary blockage

What Does My Egfr Number Mean In A Blood Test

How do you check for kidney disease?

As discussed earlier, your eGFR is calculated using an equation. The eGFR calculation is based on your gender, age, creatinine levels, and race. The portion of your blood test that factors into your eGFR is the creatinine levels. The normal range for creatinine levels are 0.74 to 1.35 mg/dL for adult men and for adult women, 0.59 to 1.04 mg/dL. Creatinine levels can be influenced by the amount of muscle mass a person has, and can affect the test results if a person has a lower or higher muscle mass than the average person, such as someone who is elderly or frail.

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Measuring And Estimating Gfr

Getting an accurate GFR level is challenging because measured GFR is a complicated and lengthy process. This makes it impractical for both clinicians and patients. It is for this reason that healthcare professionals use a formula to estimate GFR. Often, CKD does not have any symptoms until the later stages of the disease. This is the reason why reliable estimates of GFR are so important for identifying CKD as early as possible.

The standard way to estimate GFR is with a simple blood test that measures your creatinine levels. Creatinine is a waste product that comes from the digestion of dietary protein and the normal breakdown of muscle tissue. Aside from CKD, creatinine levels can be affected by other factors including diet muscle malnutrition and other chronic illnesses.

Differences between eGFR and mGFR

Measured GFR
How it works Acalculation used to estimate how well your kidneys are filtering certain agentsproduced by your body, such as:

Ameasurement of how well your kidneys are filtering certain agents not produced by your body, such as:


What Is The Evidence Behind Reporting Of The Egfr

As a result of the automatic reporting of eGFR, the clinical detection of kidney disease has significantly increased in the community.

In 2004, a clinical study involving 324 outpatients was performed to evaluate the effect of automatic laboratory reporting of eGFR with each request for serum creatinine. The effects on detection of chronic kidney disease were assessed. This automatic reporting was combined with education aimed at doctors involved in the study. The presence of an eGFR value, in conjunction with education significantly increased the detection of chronic kidney disease from 22.4% to 85.1% of patients. However, further research needs to be conducted regarding the significance and longer term outcomes resulting from this improved detection of chronic kidney disease. Last but not least, if the eGFR is normal, but there are other abnormal investigation results , the GFR should be calculated.

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What Can You Do To Improve Your Gfr And Prevent Further Kidney Damage

In most cases, kidney disease is a chronic and gradually progressing disease. While its possible to improve your GFR, youre more likely to do so with acute kidney injuries rather than with chronic kidney disease. For most people with chronic disease, positive lifestyle changes may help slow the loss of kidney function.

Some studies have shown that GFR may increase over time in people at all stages of kidney disease by:

  • Vitamin D deficiency is very common, and many people arent aware that theyre deficient. If you think you have a deficiency, talk with your doctor and get your blood levels tested. To increase your vitamin D levels, you can spend more time in the sun or add more vitamin D-rich foods to your diet.
  • Resolving other metabolic conditions.Metabolic disorders are complex and can present in many forms. Work with your doctor to find a treatment plan that addresses the root cause.

Here are other things you can do to help reduce further damage to your kidneys.

Why Take A Egfr Blood Test

Glomerular Filtration Rate (GFR)

There are several important reasons to take an eGFR blood test. The blood test measures your serum creatinine level, which is part of the eGFR result. The test itself is simple. Your health care practitioner will collect a sample of blood. If you have a family history of kidney disease, its important to have an eGFR blood test. Additionally, some conditions like Type II Diabetes and high blood pressure or hypertension, can cause kidney damage. If you get tested early, you can take steps to prevent further damage to your kidneys.

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Keep Your Kidneys Healthy

You can help lower your risk for CKD or keep it from getting worse by eating healthy, being active, and keeping your blood pressure and cholesterol levels in your target range. Make sure to take care of your kidneys if you are at risk for CKD. If you have diabetes, get tested for kidney disease once each year. Having your kidneys checked regularly gives you the best chance for finding and treating CKD early.

Meaning Of Low Gfr Levels Below 15

GFR below 30 means sever kidney disease while GFR of 15 or below means Kidney Failure.Lab results: SCR over 10 mg/dl, BUN over 150 mg/dl, Low Vitamin D, High PTH, Low Calcium, and abnormal cell casts in urine .What to do if GFR range is 15?Kidney failure reverse process include dialysis or kidney transplant when needed to survive.

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How Do I Get Ready For The Test

Healthcare providers may tell you not to eat or drink anything, except water, after midnight. You may also be asked not to eat any cooked meat the night before the test. It can increase the level of creatinine in your blood and affect your GFR results. Ask your healthcare provider if you should take your medicines on the day of your test. Wear a short-sleeved or loose shirt on the day of the test. This will make it easier to draw your blood.

Will Drinking Water Increase My Gfr

Kidney Lab Values | Glomerular Filtration Rate (GFR), Blood Urea Nitrogen (BUN), Creatinine

Increasing your water intake likely won’t affect your GFR in the long run.

If your water intake is already at normal levels, drinking more won’t slow your kidney disease. In fact, drinking too much water can be harmful.

If you have CKD, it’s crucial to ask your doctor how much water you should drink. If you have moderate to advanced CKD, you may need to limit your water intake.

Damaged kidneys might not be able to remove extra fluid from the body, causing it to build up inside the body. This can cause swelling in your feet, ankles, wrist, and face.

The excess fluid can also contribute to:

  • Shortness of breath.

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Can You Have A Low Gfr And Not Have Kidney Disease

It is possible to have a low GFR and not have kidney disease. There are some factors that can affect your creatinine levels, which is a factor in calculating your eGFR. Dehydration, urinary blockage, and some medications, can change your blood test results. If you have a low GFR, your doctor will likely perform a number of other diagnostic tests and have your blood tested again in a month.

How To Calculate Your Gfr

Estimating GFR begins with a simple serum creatinine blood test. If youre using our GFR calculator, your eGFR is calculated using the results of your blood test, along with your age, ethnicity, and gender. When your eGFR is calculated by your doctor, weight and body size may also be factored into your eGFR.

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Counting Blood Cells And Components

Problems such as anaemia and infection can be detected by counting amounts of these blood components in a blood sample:

  • haemoglobin normal levels are approximately 110-180 grams/litre in men and 115-165 grams/litre in women
  • white blood cells a normal count is approximately 4-11 thousand million per litre
  • platelets a normal count is approximately 150-350 thousand million per litre
  • albumin normal levels are 35-45g/litre.

What Is An Abnormal Egfr Blood Test Result

Estimated Glomerular Filtration Rate (eGFR) and Kidney Disease Stages ...

GFR below 60 indicates kidney disease. These levels are broken down into 4 levels. Stage 3a is mild to moderate loss of kidney function and your GFR would be 45-59. Stage 3b is considered moderate to severe and has a GFR range of 30-44. Stage 4 kidney function is considered severe and has a range of 15-29. Anything below 15 is Stage 5 and is considered kidney failure, and you may need to be on dialysis or get a kidney transplant as recommended by your doctor.

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Can Dehydration Cause Low Gfr

Bouts of severe dehydration can sometimes lead to kidney injury and a lower GFR. But it isn’t a typical cause of chronic kidney disease and low GFR.

Chronic dehydration is more likely to lead to other problems, like kidney stones and urinary tract infections.

Check with your doctor about how much water you should drink each day.

If you have moderate to advanced kidney disease, you may need to limit fluid intake. Damaged kidneys can’t filter as much fluid out of the body, causing swelling that leads to problems like high blood pressure.

What Is Kidney Glomerular Filtration Rate

Kidney glomerular filtration rate is a simple blood test performed to check how well your kidneys work by estimating how much blood passes through the glomeruli tiny filters in the kidneys filter waste from the blood per minute. Medical professionals consider the Kidney Glomerular Filtration Rate number to be the best measure of your kidney function, which is a key indicator of renal function.

Besides the blood test result, other factors are factored in to determine your GFR number. These factors include:

  • Blood Creatinine
  • Creatinine Clearance Test

The creatinine clearance test involves urine collection over 24 hours and can also estimate your kidney function. The creatinine clearance test requires a urine sample as well as a blood sample. You collect all your urine for 24 hours and then have a blood test.

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What Is A Normal Egfr Blood Test Number

Remembering that GFR levels are an indication of kidney function, there are several levels. A Stage 1 Kidney Function is when you have 90% kidney function. Your GFR then would be 90. Stage 2 Kidney Function would have a GFR of 60-89, meaning that your kidneys are functioning at 60-89% capacity. This is considered a mild loss of kidney function.

What Does Egfr Tell Healthcare Providers

What are your Kidney Numbers? uACR and eGFR Explained | CKD Heat Map | NKF

eGFR helps healthcare providers spot problems with your kidneys, including kidney disease.

Your kidneys are part of the urinary system. Kidney disease occurs when one or both kidneys have damage. When you have kidney disease, the glomeruli filter less blood. As a result, dangerous toxins can build up in your blood.

Kidney disease symptoms, such as frequent urination and muscle spasms, may not occur until you lose up to 40% of kidney function. eGFR helps providers detect the disease early so that you can start treatments to slow or stop kidney damage.

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Do I Need To Do Anything To Prepare For My Egfr Test

Your doctor may have you fast or avoid certain foods for several hours before the test. They will let you know how to prepare.

You may have a blood creatinine test as part of a regular check-up or if your doctor thinks you might have kidney disease. Your doctor will figure out your eGFR using your creatinine blood test result and your age, sex, weight and race.

Blood Tests To Check For Anemia


Hematocrit is a blood test that measures the number and the size of red blood cells. It gives a percentage of red blood cells found in whole blood. It is used to check for anemia. Anemia, a shortage of oxygen carrying red blood cells, often begins at the early stages of kidney disease. Anemia is treatable. A normal hematocrit for a healthy adult is 38-45%. For a person with CKD, the desirable Hct is 33-36%.


Hemoglobin is the part of the red blood cell that carries oxygen to the cells of the body. Both hemoglobin and hematocrit are measured to check for anemia. Three times the hemoglobin level equals the hematocrit. A normal hemoglobin level for a healthy adult is 12-15 g/dl. For a person with CKD the desirable hemoglobin is 11-12 g/dl.

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