Nephrology medical calculators
All 13 Nephrology medical calculators on DocMath, A–Z. All specialties
- Bedside Schwartz (pediatric eGFR)Quick pediatric eGFR from height and enzymatic (IDMS-traceable) creatinine; derived in children aged 1–16 y with CKD.
- eGFR — CKD-EPI 2012 cystatin CCystatin C-only eGFR (never contained race); useful when creatinine is unreliable (low muscle mass, amputation, high-protein or creatine intake).
- eGFR — CKD-EPI 2021 creatinine–cystatin C (race-free)Most accurate routine eGFR; KDIGO 2024 recommends it when cystatin C is available or eGFRcr is less accurate (age ≥18).
- eGFR — CKiD U25 (children and young adults, creatinine and/or cystatin C)Age- and sex-specific eGFR for ages 1–25 y with CKD, from height/creatinine, cystatin C, or the average of both (updates the single-constant 2009 CKiD bedside equation).
- EPTS (Estimated Post-Transplant Survival score, OPTN)Adult kidney transplant candidate: expected post-transplant longevity relative to the US waiting list (lower = longer); EPTS ≤20% gets priority for KDPI ≤20% kidneys.
- Fractional excretion of urea (FEUrea)Prerenal vs intrinsic AKI when the patient has received diuretics (FENa is unreliable).
- KDIGO AKI staging (creatinine and urine output)Defines and stages acute kidney injury from the serum creatinine rise and/or urine output; the higher stage of the two applies.
- KDIGO CKD risk category (G × A heat map)Places a patient in the KDIGO 2024 GFR × albuminuria grid: risk of progression (color) and suggested monitoring frequency.
- KDRI and KDPI (Kidney Donor Profile Index, OPTN refit without race or HCV)Deceased-donor kidney: relative risk of graft failure (KDRI) and its percentile among recent US donors (KDPI), as used in OPTN allocation since 31 Oct 2024.
- Kidney Failure Risk Equation (KFRE, 4- or 8-variable)2- and 5-year risk of kidney failure (dialysis or transplant) in adults with CKD G3–G5; 8-variable version when albumin, phosphate, bicarbonate and calcium are entered.
- Mehran risk score (contrast-induced nephropathy after PCI)Predicts contrast-induced nephropathy after percutaneous coronary intervention from 8 clinical and procedural factors (eGFR version).
- Sodium change per liter of infusate (Adrogué–Madias)Predicts the change in serum sodium after 1 L of a chosen infusate, to plan correction of hypo- or hypernatremia.
- Urine anion gapIndirect estimate of urinary ammonium in normal-anion-gap (hyperchloraemic) metabolic acidosis: GI bicarbonate loss vs impaired distal acidification.