NEPHROLOGY

Nephrology calculators for kidney function, eGFR, electrolytes, and dialysis. Designed for nephrologists, clinicians, and medical students.

Infusion Rate Calculator for Hyponatremia or Hypernatremia Treatment (Adrogue-Madias formula)

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Medical Calculator – SonDoctor.com × Infusion Rate Calculator for Hyponatremia or Hypernatremia Treatment (Adrogue-Madias formula) Calculate infusion rates for Hyponatremia or Hypernatremia treatment using the Adrogue-Madias formula. Infusion rate [mL/hr] = ( Na correction rate[mEq/L/hr] / (((infusate Na+infusate K)-Serum Na) / (TBW+1)) )×1000 ※ TBW (Total Body Water) = Body weight × 0.6 (0.5, if … Read more

Calculator for Serum Na Change After Infusion (Adrogue-Madias Formula)

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Medical Calculator – SonDoctor.com × Calculator for Serum Na Change After Infusion (Adrogue-Madias Formula) Adrogue-Madias formula Δ[serum Na](mEq/L) = ([Infusion Na] + [Infusion K] – [Serum Na]) ÷ (TBW(L) + V(L)) ※ TBW (Total Body Water) = Body weight × 0.6 (0.5, if female) ※ V : volume of infusion (L) ※ For Na and … Read more

Hyponatremia Treatment – 3% Saline Infusion Rate Calculator (Adrogue-Madias Formula)

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Medical Calculator – SonDoctor.com × Hyponatremia Treatment – 3% Saline Infusion Rate Calculator (Adrogue-Madias Formula) This calculator uses the Adrogue-Madias formula to determine the infusion rate of 3% saline during the initial treatment of Hyponatremia. Infusion rate of 3% Saline[mL/hr] = ( (Target Na-Serum Na) / ((513-Serum Na) / (TBW+1)) / Target period[hr] )×1000 ※ … Read more

BUN / Creatinine Ratio Calculator

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Medical Calculator – SonDoctor.com × BUN / Creatinine Ratio Calculator BUN (mg/dL) : Creatinine (mg/dL) : BUN-to-Cr ratio Normal: about 12 ~ 20 – Low : ATN, Low protein intake, Starvation, Severe liver disease – High : Prerenal uremia, High protein intake, GI bleeding – High with elevated Cr : Post-renal obstruction, Prerenal uremia with … Read more

RFI Calculator (Renal Failure Index)

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Medical Calculator – SonDoctor.com × RFI Calculator (Renal Failure Index) RFI = Urine Na / ( Urine Cr / Serum Cr) Urine Sodium (mmol/L) : Urine Creatinine (mg/dL) : Serum Creatinine (mg/dL) : RFI < 1 : Prerenal Azotemia RFI > 1 : Intrinsic Renal Azotemia

Urine Na-to-K Ratio Calculator (Check High vs. Low Salt Intake)

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Medical Calculator – SonDoctor.com × Urine Na-to-K Ratio Calculator (Check High vs. Low Salt Intake) Urine Sodium (Na, mmol/L) : Urine Potassium (K, mmol/L) : Based on two studies, salt intake levels are categorized as: Urine Na/K ratio ＜ 1.0: Ideal low-salt diet at WHO recommended level 1.0 ~ 1.5: Favorable low-salt intake 1.5 ~ … Read more

Electrolyte free water clearance (EFWC) Calculator

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Medical Calculator – SonDoctor.com × Electrolyte free water clearance (EFWC) Calculator EFWC = UV x (1-((Urine Na + Urine K) / Plasma Na)) UV : Urine flow rate (L/day) * If the 24-hour urine volume is not entered, only a POSITIVE or NEGATIVE result will be provided. Urine Na (mEq/L): Urine K (mEq/L): Plasma Na … Read more

Free water clearance (FWC) Calculator

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Medical Calculator – SonDoctor.com × Free water clearance (FWC) Calculator FWC = UV x (1-(U osm / P osm)) UV : Urine flow rate (L/day) * If the 24-hour urine volume is not entered, only a POSITIVE or NEGATIVE result will be provided. Urine Osm (mOsm/kg): Plasma Osm (mOsm/kg): [Optional] 24hr Urine Volume (L/day): FWC … Read more

Total Sodium Deficit Calculator in Hyponatremia

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Medical Calculator – SonDoctor.com × Total Sodium Deficit Calculator in Hyponatremia Male: (Desired Na – Measured Na) × 0.6 × Weight(kg) Female: (Desired Na – Measured Na) × 0.5 × Weight(kg) Measured Serum Sodium (mmol/L) : Target Serum Sodium (mmol/L) : Body weight (kg) : Male | Female *Normal saline 1L contains 154 mEq of … Read more