Stage 1: Normal Kidney Function
eGFR is in the normal range, but other signs of kidney damage may be present.
This tool is for informational purposes only and is not a substitute for professional medical advice.
This calculator estimates your eGFR from age, sex, and serum creatinine. eGFR tells how well your kidneys filter blood. Results are shown in mL/min/1.73 m². Use the tool only for general information. See a doctor for health advice. :contentReference[oaicite:1]{index=1}
What is eGFR?
eGFR stands for estimated glomerular filtration rate. It estimates kidney function. A higher number means better filtering. An eGFR of 90 or higher is usually normal. Values from 60–89 may be early changes but can be normal without other signs of kidney damage. Values under 60 suggest reduced kidney function. :contentReference[oaicite:2]{index=2}
How the calculator works
Modern eGFR tests use equations like the CKD-EPI formula. The formula uses serum creatinine, age, sex, and sometimes race or other markers. Labs often report eGFR automatically when they measure creatinine. For exact research equations, see clinical sources. :contentReference[oaicite:3]{index=3}
Units and conversion
Serum creatinine is often reported in mg/dL or μmol/L. To convert μmol/L to mg/dL divide by 88.4. The eGFR unit is mL/min/1.73 m². :contentReference[oaicite:4]{index=4}
Example (your data)
- Age: 50
- Sex: Male
- Serum creatinine: 0.90 mg/dL
- Estimated eGFR: 104 mL/min/1.73 m²
- Stage: G1 — Normal kidney function (with other evidence of kidney damage if present)
This result means your estimated kidney filter rate is in the normal range for most adults. Labs and doctors combine eGFR with other tests to decide if there is real kidney disease. :contentReference[oaicite:5]{index=5}
What the stages mean
CKD stages group eGFR into ranges called G1–G5. Roughly:
- G1: ≥ 90 — normal or high (needs other evidence to call CKD)
- G2: 60–89 — mildly decreased
- G3a: 45–59 — mild to moderate decrease
- G3b: 30–44 — moderate to severe decrease
- G4: 15–29 — severe decrease
- G5: <15 — kidney failure
Doctors also check for protein in urine and other signs. Staging uses both G (GFR) and A (albuminuria). Persistent abnormal results over three months are needed to diagnose chronic kidney disease. :contentReference[oaicite:6]{index=6}
Limitations
eGFR is an estimate. Factors such as muscle mass, diet, medicines, and lab methods can change serum creatinine. One normal eGFR does not rule out kidney damage. Repeat tests and a doctor’s exam give a clearer picture. :contentReference[oaicite:7]{index=7}
When to see a doctor
See a doctor if your eGFR is persistently low, if you have blood or protein in urine, swelling, unexplained tiredness, or other concerns. A clinician can order confirmatory tests and give clear advice. :contentReference[oaicite:8]{index=8}
Disclaimer: This information is for educational use only. It is not medical advice. For diagnosis or treatment, consult a healthcare professional. The example values above are estimates. For official tools and calculators, see clinical sources or the National Kidney Foundation. :contentReference[oaicite:9]{index=9}