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Estimated glomerular filtration rate (eGFR) based on serum creatinine

Published: August 9, 2026Updated: August 16, 2026

This test measures how well your kidneys are filtering waste from your blood using a simple blood sample. It helps assess kidney function over time.

Quick summary

["Your eGFR helps doctors track kidney health and guide treatment plans."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
104246-4
Short code
LV US.3D.A3C+Estimated
Synonyms
LV US.3D.A3C+Estimated
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
us-d-a-c-estimated
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Matters

eGFR is a key measure of kidney function because it estimates how well your kidneys are filtering waste products like creatinine from your blood. Unlike traditional kidney function tests that require more complex procedures, eGFR provides a quick and reliable snapshot of kidney performance.

How the Test Works

Your blood is drawn and sent to a lab where creatinine levels are measured. Special formulas then calculate your eGFR based on your age, sex, race, and creatinine results. This method helps identify early kidney problems before symptoms appear.

What to Expect Before the Test

No special preparation is needed for this test. You may have a slight bruise or discomfort at the needle site, but it usually fades quickly. If you’re on certain medications (like some pain relievers), let your doctor know before the test.

What the Results Mean

Results are typically reported as a number (e.g., 60 mL/min/1.73m²). Lower values suggest reduced kidney function, while higher values indicate normal or better kidney performance. Your doctor will interpret results in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

eGFR (Serum Cr)

Frequently asked questions

Why is my eGFR important?
eGFR helps detect early kidney damage, monitor chronic conditions (like diabetes or high blood pressure), and guide treatment decisions. It’s also used to assess kidney function before surgeries or when planning certain medications.
What if my eGFR is low?
A low eGFR may signal kidney strain, but it doesn’t always mean kidney disease. Your doctor will review your medical history, other test results, and symptoms to determine next steps. Lifestyle changes (like diet or hydration adjustments) may be recommended.
Does diet affect eGFR results?
Yes, high-protein or high-sodium diets can temporarily alter creatinine levels, which may impact eGFR. For accurate results, follow your doctor’s advice on diet and timing of tests.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy