KFT — Know Your Kidney • Kidney Function Test Calculator

KFT

Know Your Kidney — KFT calculator

Estimate eGFR (CKD-EPI 2021) • Quick interpretation for patients & clinicians

Enter patient data

Age (years)

Sex Male Female

Serum creatinine (mg/dL)

BUN / Urea (mg/dL)

Sodium (mmol/L)

Potassium (mmol/L)

Urine albumin-to-creatinine ratio (uACR, mg/g)

Results

Typical reference ranges (adult)

• eGFR: ≥90 mL/min/1.73m² (normal); < 60 suggests chronic kidney disease.
• BUN: ~6–24 mg/dL (varies by lab).
• Sodium: ~133–146 mmol/L • Potassium: ~3.5–5.3 mmol/L.

Clinical tips

• eGFR is an estimate — interpret with symptoms, urine albumin, imaging and clinician judgment.
• Dehydration, medications, muscle mass affect creatinine/BUN.
• If eGFR <60 or albuminuria present, consult a nephrologist.

How this tool calculates eGFR

This tool uses the race-free CKD-EPI creatinine equation (2021). It requires age, sex and serum creatinine in mg/dL. The 2021 CKD-EPI equation is the recommended standard for eGFR estimation in adults. For reference and clinical decisions, consult your clinician or nephrologist.

Sources: NKF / Kidney.org (CKD-EPI 2021), NIDDK, StatPearls, Schema.org for MedicalTest. See bottom for links. 3

Built for patient education; not a substitute for medical advice. If you have concerns about kidney disease, seek professional medical evaluation.

Clinical staging (KDIGO): G1 ≥90; G2 60–89; G3a 45–59; G3b 30–44; G4 15–29; G5 <15 mL/min/1.73m². 4

Sources (key):

• CKD-EPI Creatinine Equation (2021) — Kidney.org / NKF. 5
• eGFR equations overview — NIDDK. 6
• Renal function reference & staging — StatPearls / NCBI. 7
• Schema.org MedicalTest. 8
• Common lab ranges (electrolytes) — pathology reference. 9