A Comparison of "Mediquations," "MediMath," and "Medical Calculator," Three Medical Calculators for the iPhone

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Si! Es un iPhone!Image by Roberto_Garcia via FlickrRemember when there weren't any medical calculators for the iPhone? Now there are at least three — Mediquations for $1.99, Medimath, which is free until 10/12 (and will be $4.99 thereafter), and Medical Calculator (also free for a limited time). All are rated four stars at the iTunes store, and all are excellent and easy to use. As there are certain variations in the formulas included in each program, I've provided them here to make your choice easier:

Mediquations (Version 5)
  • A-a O2 Gradient
  • Abbreviated Mental Test Score (AMTS)
  • ABCD Score for TIA NEW!
  • ABCD2 Score for TIA NEW!
  • Absolute Neutrophil Count
  • Age
  • Alvarado Score
  • Anion Gap
  • Aortic Valve Area (Continuity)
  • Aortic Valve Area (Gordon)
  • APACHE II score
  • APGAR
  • Arterial Oxygen Content
  • Arterial Oxygen Delivery
  • Basic Activities of Daily Living (ADL) (Barthel)
  • Basal Energy Expenditure (Harris-Benedict)
  • Bayesian Sensitivity/Specificity
  • Bishop score for labor induction NEW!
  • Body Mass Index (BMI)
  • Body Surface Area (BSA): Mosteller Formula
  • Body Surface Area: Dubois Formula
  • Body Surface Area (Unknown Height; Current Formula)
  • Boston Criteria for Heart Failure
  • Carboplatin Dosing
  • CHADS Score
  • Change in Serum Sodium
  • Child-Pugh Criteria
  • Cardiac Output (Fick)
  • Cockcroft Gault GFR
  • Corrected QT (QTc)
  • Corrected Serum Calcium
  • Corrected Serum Phenytoin
  • Corrected Serum Sodium
  • Creatinine Clearance (Cockcroft Gault) (CrCl)
  • Creatinine Clearance (measured) (CrCl)
  • CURB-65 Score for Community Acquired Pneumonia
  • Delta-Delta NEW!
  • Delta Gap
  • Dermatome Map (Reference; No Calculation)
  • Dose Calculator (Corrected for BSA, Calvert, or Weight) NEW!
  • Fractional Excretion of Calcium (FECa)
  • Fractional Excretion of Sodium (FENa)
  • Fractional Excretion of Urea (FEUrea)
  • Framingham Cardiac Risk Score
  • Free Sodium Deficit for Hyponatremia
  • Free Water Deficit for Hypernatremia
  • Gas Unit Conversion (mmHg to/from kPa)
  • Glasgow Coma Scale
  • Glucose Infusion Rate (GIR) NEW!
  • Heart Rate from EKG
  • Henderson-Hasselbach Equation
  • Hepatitis Discriminant Function
  • Ideal Body Weight (IBW)
  • Iron Deficit NEW!
  • Iron Dextran Dosing
  • IV Drip Rate
  • IV Infusion Rate NEW!
  • Kt/V and Urea Reduction Rate
  • Light's Criteria
  • LDL Cholesterol Estimation (Friedewald Equation)
  • Liquid Dose Calculator (Corrected for BSA, Calvert, or Weight) NEW!
  • Maintenance Fluids
  • Maximum Allowable Blood Loss
  • MDRD GFR
  • Mean Arterial Pressure
  • MELD Score
  • Mini-Mental Status Exam (MMSE)
  • NIH Stroke Scale NEW!
  • Number Needed to Treat (NNT)
  • Opiate Equivalence
  • Osmolality (Serum)
  • Osmotic Gap (Stool)
  • Ottawa Ankle and Knee Rules NEW!
  • Oxygen Index
  • P/F Ratio
  • Parkland Formula
  • Peak Flow (predicted)
  • Pediatric Dosing Calculator
  • PELD Score
  • PERC Rule (Pulmonary Embolism Rule-out Criteria)
  • Pneumonia Severity Index (PORT Score)
  • PORT Score
  • Pregnancy Calculator (enter LMP or Due Date)
  • Pulmonary Vascular Resistance
  • Rate Pressure Product
  • Ranson Criteria
  • Reticulocyte Production Index
  • Revised Trauma Score (regular and coded)
  • Schwartz Pedi GFR
  • Serum Ascites Albumin Gradient (SAAG)
  • SIRS Criteria
  • SOFA score NEW!
  • Steroid Equivalence
  • Systemic Vascular Resistance
  • Temperature Conversion
  • TIMI NSTEMI
  • TIMI STEMI
  • Tubular Resorption of Phosphate (TRP)
  • Transtubular K Gradient
  • Urinary Anion Gap NEW!
  • Urinary Calcium Excretion (Ca / Cr)
  • Urine Output
  • Weight Unit Conversion
  • Well's Criteria
  • Winters' Formula
MediMath (Version 1.3)
  • A-a Oxygen Gradient
  • Abbreviated Mental Test Score (AMTS)
  • ABCD Squared (Restroke Risk)
  • Absolute Neutrophil Count
  • Age,
  • Anion Gap (Serum)
  • Anion Gap (Urine)
  • Aortic Valve Area (Continuity)
  • Aortic Valve Area (Gorlin)
  • Apache II (ICU Scoring)
  • APGAR Score
  • Arterial Oxygen Content
  • Barthel's ADL Index
  • Basal Energy Expenditure
  • Bicarbonate Deficit
  • Body Mass Index (BMI)
  • Body Mass Index for Age (Pediatric BMI)
  • Body Surface Area
  • Bohr Dead Space
  • Burn Fluid Requirements (Parkland)
  • Cardiac Output (CO)
  • CHADS Score (AFib Stroke Risk)
  • Child-Pugh Score
  • Corrected CSF WBCs for RBCs
  • Corrected QT
  • Corrected Serum Calcium
  • Corrected Serum Sodium
  • Creatinine Clearance (Cockcroft-Gault)
  • Creatinine Clearance (Measured)
  • Endotracheal Tube Size (Pediatric)
  • Fraction Excretion of Sodium (FeNA)
  • Framingham Cardiac Risk
  • GFR (MDRD)
  • Glasgow Coma Scale
  • Hepatitis Discriminant
  • Ideal Body Weight
  • IV Concentration
  • IV Concentration with Weight
  • IV Dose
  • IV Dose with Weight
  • IV Rate
  • IV Rate with Weight
  • Kt/V (Daugirdas formula)
  • LDL Cholesterol
  • Maintenance Fluids
  • Mean Arterial Pressure (MAP)
  • MELD Score
  • Mini Mental Status Exam
  • Mixed Venous Oxygen Content
  • Negative Predictive Value (Prospective)
  • Negative Predictive Value (Retrospective)
  • NIH Stroke Scale
  • Number Needed to Harm (Retrospective)
  • Number Needed to Treat (Retrospective)
  • Number Needed To Treat/Harm (Prospective)
  • Osmolal Gap (Stool)
  • Osmolality (Serum)
  • Oxygenation Index
  • Peak Flow (Predicted)
  • PELD Score
  • pH (Henderson-Hasselbach Equation)
  • PORT Score (Pneumonia Mortality)
  • Positive Predictive Value (Prospective)
  • Positive Predictive Value (Retrospective)
  • Ranson's Criteria (Pancreatitis Mortality)
  • Reticulocyte Index
  • Sensitivity and Specificity (Bayesian)
  • Sodium Deficit
  • TIMI Score (STEMI)
  • TIMI Score (Unstable Angina/NSTEMI)
  • Transtubular Potassium Gradient
  • Umbilical Line Placement
  • Water Deficit
  • Winter's Formula
Medical Calculator (Version 1.5)
  • A-a Oxygen Gradient
  • Absolute Neutrophile Count (ANC)
  • Age Calculator
  • Alcoholic Hepatitis Discriminant Function
  • Anion Gap
  • APACHE II Score
  • APGAR Score
  • Basal Energy Expenditure
  • Body Mass Index (BMI)
  • Body Surface Area (BSA)
  • Bicarb Deficit
  • CHADS2 Score for stroke risk
  • Child-Pugh Score
  • Corrected Calcium for Hypoalbuminemia
  • Corrected QT for HR (QTc)
  • Corrected Sodium
  • Creatinine Clearance (Cockcroft-Gault)
  • Creatinine Clearance (Measured)
  • CSF WBC Correction for RBCs
  • Delta Gap
  • Fick Cardiac Output
  • Fractional Excretion of Sodium (FENa)
  • Fractional Excretion of Urea (FEUrea)
  • Framingham Cardiac Risk
  • Free Water Deficit
  • GFR
  • Glasgow Coma Scale
  • Ideal Body Weight (IBW)
  • IV Dose Calculator
  • IV Infusion Rate
  • LDL Cholesterol
  • Lean Body Weight
  • Maintenance Fluids
  • Mean Arterial Pressure (MAP)
  • MELD Score (Model for End-Stage Liver Disease)
  • Opioid (Narcotic) Converter
  • Oxygenation Index
  • Parkland Burns
  • o Fluid requirements for first 8 hours
  • o Fluid requirements for first 24 hours
  • PERC Rule
  • PORT (PSI) Score
  • Pregnancy Wheel
  • o Enter last menstrual period (LMP) or due date (EDC)
  • o Conception date
  • o 1st trimester date
  • o 2nd trimester date
  • o Estimated Date of Confinement (EDC, due date)
  • o Weeks pregnant today
  • Ranson's Criteria for pancreatitis mortality
  • Renal Failure Index
  • Steroid Converter
  • TIMI Score for STEMI
  • TIMI Score for UA/NSTEMI
  • Weight Conversions
  • Well's Criteria for Pulmonary Embolism (PE)
  • Winter's Formula for Metabolic Acidosis Compensation
  • What's new in this version:
  • Added Opioid (Narcotic) Converter
  • Added Steroid Converter
  • Added IV Dose Calculator
  • Added PORT (PSI) Score
  • Added APACHE II Score
  • Added PERC Rule
  • Added Child-Pugh Score
  • Improved Cockcroft-Gault CrCl to show results with IBW and adjusted BW
What are your favorite medical apps for the iPhone? Do you have a preferred medical calculator app? Feel free to leave a comment.

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MD, FACP, FASN

Dr. Schwimmer's blog explores the intersection of medicine, new technologies, and the Internet.

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