CMP Updated Apr 17, 2026

Estimated Glomerular Filtration Rate (eGFR)

Estimated Glomerular Filtration Rate (eGFR) is a calculated lab value that estimates how well the kidneys filter blood. On a lab report, eGFR is usually reported from creatinine, age, sex, and sometimes race-adjusted equations, and it helps show overall filtering capacity. eGFR is commonly included on a metabolic panel and is often reviewed with creatinine and blood urea nitrogen (BUN).

What Is Estimated Glomerular Filtration Rate (eGFR)?

Estimated Glomerular Filtration Rate (eGFR) is a calculated value that estimates how much blood the kidneys filter over time. It is often shown on a lab report or as eGFR on a blood test, usually alongside creatinine. The result reflects how laboratory input values are combined into a filtering estimate rather than a directly measured blood component.

Why Is Estimated Glomerular Filtration Rate (eGFR) Tested?

eGFR is commonly included on a metabolic panel, especially a comprehensive metabolic panel, and sometimes appears on related kidney-focused lab work. The eGFR test is used to summarize filtering capacity from a few measured inputs, most often creatinine plus demographic factors. In routine screening, the Estimated Glomerular Filtration Rate test helps place creatinine and blood urea nitrogen (BUN) into a broader picture.

Already have your Estimated Glomerular Filtration Rate results?

Upload your blood test to BloodSight and see what each result means in context.

Get Started

Estimated Glomerular Filtration Rate (eGFR) Normal Range

Group Range Unit
Adult Male 90–120 mL/min/1.73 m²
Adult Female 90–120 mL/min/1.73 m²

Reference ranges may vary by laboratory and individual factors.

What Does High eGFR Mean?

High eGFR usually means the estimated filtration number is above the expected reference interval, often above about 90 mL/min/1.73 m² in adults. A high eGFR can reflect stronger estimated filtering or, in some settings, a calculation that is pushed upward by low creatinine. When reading an Estimated Glomerular Filtration Rate on a lab report, a high eGFR is interpreted with the rest of the metabolic panel rather than by itself.

Associated factors

Low creatinine — a smaller creatinine input can make the eGFR calculation appear higher.
Higher hydration — greater fluid intake can dilute creatinine and shift the estimate upward.
Recent exercise pattern — changing muscle turnover can alter creatinine and affect the calculated eGFR.
Lower body muscle mass — less creatinine production can raise the calculated value.
Pregnancy — expanded blood volume and physiologic changes can increase filtration estimates.
Dietary pattern — lower meat intake can reduce creatinine generation and raise the estimate.
Altitude exposure — adaptation to lower oxygen availability can change circulating markers that feed the calculation.
Certain medications — some drugs change creatinine handling and can make eGFR look higher.
Age-related variation — younger adults often have higher Estimated Glomerular Filtration Rate normal range values than older adults.

What Does Low eGFR Mean?

Low eGFR means the estimated filtration number is below the usual reference interval, often below 60 mL/min/1.73 m² in adult reporting. A low eGFR can reflect less efficient filtering, or a calculation shifted downward by higher creatinine. On an Estimated Glomerular Filtration Rate test result, low eGFR is typically reviewed together with creatinine, BUN, and the overall metabolic panel.

Associated factors

Dehydration — reduced fluid volume can concentrate creatinine and lower the eGFR estimate.
Higher muscle mass — more creatinine production can push the calculation downward.
Recent intense exercise — temporary creatinine rise can make the eGFR look low.
High meat intake before testing — more creatinine precursors can increase the measured input.
Certain medications — some drugs can change creatinine handling and lower the calculated value.
Older age — the Estimated Glomerular Filtration Rate normal range often trends lower with age.
Lower calorie intake — reduced intake can affect creatinine generation and the estimate.
Large body size differences — body composition can influence how the formula behaves.
Sample variation — normal lab-to-lab variation can create a low eGFR on one blood draw and a higher one on another.

How Estimated Glomerular Filtration Rate (eGFR) Relates to Other Values

eGFR is most often read with creatinine, blood urea nitrogen (BUN), and sometimes electrolytes such as sodium and potassium on the same metabolic panel. Creatinine is the main input for the calculation, so changes in creatinine often move eGFR in the opposite direction. BUN adds another view of how proteins and fluids are being processed, while sodium and potassium show how the blood chemistry pattern fits together. When eGFR is reviewed with albumin and total protein, the broader lab picture can describe fluid balance and protein status.

What Factors Affect Estimated Glomerular Filtration Rate (eGFR) Levels?

Age is one of the biggest influences on eGFR, and the Estimated Glomerular Filtration Rate normal range often shifts lower over time. Sex, body size, and muscle mass also affect creatinine, which changes the calculation behind the eGFR test. Hydration status, recent exercise, and recent food intake can shift the Estimated Glomerular Filtration Rate test result from one draw to the next. Lab method matters too, because different equations and instruments can report slightly different values. In some populations, reporting equations may use different adjustment factors, which is why eGFR on a blood test can vary by laboratory.

How It Is Tested

eGFR is calculated from a blood sample, not measured directly as its own substance. The lab uses creatinine and a formula to estimate filtration, and the result is usually reported in mL/min/1.73 m². In a metabolic panel, the Estimated Glomerular Filtration Rate test result is often printed next to creatinine.

How to Prepare

No fasting is usually required for an eGFR test as part of a routine metabolic panel. Because the result depends on creatinine, recent heavy exercise or a large meat-heavy meal can affect the number.

Frequently Asked Questions

What is the normal range for Estimated Glomerular Filtration Rate?
For many adult lab reports, the Estimated Glomerular Filtration Rate normal range is about 90 to 120 mL/min/1.73 m². Some laboratories report values a bit differently depending on the equation used. eGFR is usually interpreted alongside creatinine and the rest of the metabolic panel.
What does eGFR stand for?
eGFR stands for estimated glomerular filtration rate. It is a calculated number shown on an eGFR test or on a blood test result that uses creatinine and other inputs. The abbreviation is commonly used on a lab report because it is shorter than the full name.
What does a high Estimated Glomerular Filtration Rate mean on a lab report?
A high eGFR means the calculated filtration estimate is above the usual reference interval. In practice, high eGFR can happen when creatinine is low, when body muscle mass is lower, or when fluid status changes the calculation. A high eGFR is read together with the rest of the metabolic panel rather than alone.
What does a low Estimated Glomerular Filtration Rate mean on a lab report?
A low eGFR means the estimated filtration number is below the usual reference interval. It can happen when creatinine is higher, after heavy exercise, or when hydration status changes the calculation. Low eGFR on a lab report is usually compared with creatinine, BUN, and other metabolic panel values.
Can hydration affect Estimated Glomerular Filtration Rate?
Yes. Hydration can affect eGFR because it changes creatinine concentration in the blood, which changes the formula output. A well-hydrated sample may look different from a dehydrated one on an eGFR test.
What is the difference between Estimated Glomerular Filtration Rate and creatinine?
Creatinine is a measured blood value, while eGFR is a calculated estimate that uses creatinine plus other factors. On a metabolic panel, creatinine gives the raw number and eGFR translates it into a filtering estimate. They are related, but they are not the same result.
What unit is Estimated Glomerular Filtration Rate measured in?
eGFR is usually reported in mL/min/1.73 m². This unit reflects an estimated filtration rate standardized to body surface area. Different laboratories may format the result slightly differently, but this is the common unit on a lab report.
How much can Estimated Glomerular Filtration Rate change between tests?
eGFR can change from test to test because it is calculated from creatinine and other inputs that can vary day to day. Small shifts are common after changes in hydration, exercise, or diet. Larger changes may reflect a real change in the numbers feeding the eGFR test.
Is Estimated Glomerular Filtration Rate different for men and women?
Yes, eGFR can differ by sex because the calculation may include sex-based factors. Men often have a different creatinine pattern than women because of average differences in muscle mass. That is why a lab report may show different Estimated Glomerular Filtration Rate normal range interpretation by group.
Why is Estimated Glomerular Filtration Rate tested in a metabolic panel?
eGFR is included in a metabolic panel because it helps summarize how well blood is being filtered based on creatinine. It adds context to other values such as BUN, sodium, potassium, and creatinine. On a lab report, the Estimated Glomerular Filtration Rate test helps connect those numbers into one filtering estimate.

Disclaimer

This content is for informational and educational purposes only. It is not intended as medical advice, diagnosis, or treatment recommendation. Reference ranges may vary by laboratory. Always discuss your results with a qualified healthcare professional.

Related Tests

Glucose

Glucose is the amount of glucose, or blood sugar, measured in a blood sample. On a lab report, Glucose helps show how much sugar is circulating in the blood at the time of the test. In a metabolic panel, the Glucose result is often reviewed alongside other chemistry markers to give a broader snapshot of blood chemistry.

→
Blood Urea Nitrogen BUN

Blood Urea Nitrogen (BUN) is a lab value that measures the amount of urea nitrogen in the blood, a waste product made from protein breakdown. It is reported as BUN on a blood test or Blood Urea Nitrogen on a lab report and helps describe how blood chemistry is changing over time.

→
Creatinine

Creatinine is a waste product measured in blood and used as part of a metabolic panel. It is commonly shown on a blood test as Creatinine and helps describe how the body is handling muscle breakdown products and fluid balance. The Creatinine test is often read with other lab values to understand overall blood chemistry.

→
Sodium Na

Sodium (Na) is a lab value that measures the amount of sodium in blood, usually reported in mmol/L. Sodium on a blood test helps show how concentrated the blood sample is and how water balance is reflected in the result. On a metabolic panel, Na is read alongside other chemistry markers to describe the overall composition of the blood sample.

→
Potassium K

Potassium (K) is a blood electrolyte measured on a lab report to show how much K is circulating in the bloodstream. It is commonly included in a metabolic panel and helps describe fluid balance, cell function, and the overall chemical makeup of blood. High or low K values on a blood test are read alongside other markers such as sodium and creatinine.

→
Chloride Cl

Chloride (Cl) is a blood chemistry value that measures the amount of chloride, a major charged mineral in the fluid outside cells. On a lab report, Cl helps describe fluid balance and how the body keeps electrolytes in a steady range. It is commonly included in a Metabolic Panel and reported in mmol/L.

→