Nephrology calculators for kidney function, eGFR, electrolytes, and dialysis. Designed for nephrologists, clinicians, and medical students.
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
Medical Calculator – SonDoctor.com × CRRT Dose Calculator CRRT dose = (Dialysate flow + Replacement flow + Patient Removal) / Bwt The recommended dose is typically 20–40 mL/kg/hr, often starting at around 35 mL/kg/hr. Body weight (kg) : Dialysate flow (mL/hr) : Replacement flow (mL/hr) : Patient Removal flow (mL/hr) :
Medical Calculator – SonDoctor.com × Corrected Sodium in Hypertriglyceridemia Corrected Na (mEq/L) = Na + [{(0.21 x (TG(mg/dL) / 100)} – 0.6 ] x (Na / 100) Serum Sodium (mEq/L) : Serum Triglycerides (mg/dL) : Reference : Dimeski G, Mollee P, Carter A. Effects of hyperlipidemia on plasma sodium, potassium, and chloride measurements by an … Read more
Medical Calculator – SonDoctor.com × Calculate Fractional Excretion of Multiple Electrolytes Quickly calculate fractional excretion (FE) of various electrolytes. Serum Creatinine and Urine Creatinine are required. Enter any electrolyte values (serum/urine) to calculate its FE. [ Blood chemistry ] Serum Creatinine (mg/dL) : Serum Sodium (mmol/L) : Serum Chloride (mmol/L) : Serum Urea (mg/dL) : … Read more
Medical Calculator – SonDoctor.com × FENa Calculator (Fractional Excretion of Sodium) FENa(%) = (Na clearance / Cr clearance) × 100 = (((Urine Na × V)/ Serum Na) / ((Urine Cr × V) / Serum Cr)) × 100 = (Urine Na × Serum Cr) / (Serum Na × Urine Cr) × 100 Serum Sodium (mmol/L) : … Read more
Medical Calculator – SonDoctor.com × Creatinine Clearance Using 24-Hour Urine Ccr (mL/min) = (Urine Cr × (Urine Volume [24hr urine] / 1440)) / Serum Cr (BSA correction(1.73/BSA) is recommended for accurate GFR assessment) Ccr (mL/min/1.73㎡) = {(Urine Cr × (Urine Volume / 1440)) / Serum Cr} × (1.73[㎡] / BSA[㎡]) BSA (Mosteller) : √[(Height(cm) × … Read more
Medical Calculator – SonDoctor.com × Osmolality Calculator Calculated Osm = (2 × Na) + (glucose / 18) + (BUN / 2.8) Effective Osm = (2 × Na) + (glucose / 18) (BUN crosses cell membranes freely and has minimal osmotic effect) Osmolar gap = Measured Osm – Calculated Osm Serum Sodium (mmol/L) : Serum Glucose … Read more
Medical Calculator – SonDoctor.com × Urine K-to-Creatinine Ratio Calculator Estimate daily potassium excretion using spot urine chemistry. Urine K/Cr ratio : mEq K / g Cr (K in mmol = mEq) Urine K (mmol/L) : Urine Cr (mg/dL) :