Nephrology calculators for kidney function, eGFR, electrolytes, and dialysis. Designed for nephrologists, clinicians, and medical students.
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
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
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
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
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
Medical Calculator – SonDoctor.com × Free Water Deficit Calculator in Hypernatremia Male: ((Measured Na – 140) / 140 ) × 0.6 × Weight(kg) Female: ((Measured Na – 140) / 140 ) × 0.5 × Weight(kg) Measured Serum Sodium (mmol/L) : Target Serum Sodium (mmol/L) : Body weight (kg) : Male | Female
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
Medical Calculator – SonDoctor.com × HUGE (Hematocrit + Blood urea + GEnder) Calculator This calculator helps differentiate between normal aging kidney and chronic kidney disease (CKD) in patients over 70 using the HUGE formula: L = 2.505458 – [0.264418 x Hct] + [0.118100 x Urea] [+ 1.383960 if male] Hematocrit (%) : Serum Urea (mg/dL) … Read more
Medical Calculator – SonDoctor.com × Transferrin Saturation Calculator T.sat (%) = (Fe / TIBC) x 100 Serum Fe (mcg/dL) : Serum TIBC (mcg/dL) :
Medical Calculator – SonDoctor.com × Albumin to Globulin (A/G) Ratio Calculator A/G ratio = Albumin / (Total protein – Albumin) Calculated globulin = Total protein – Albumin Total Protein (g/dL) : Albumin (g/dL) : Normally, albumin is slightly higher than globulin, so A/G ratio is slightly over 1. When A/G ratio is less than 1, … Read more