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The First Medical Calculator for the iPhone: Mediquations

I've lost count of the number of times I've been asked if the iPhone has a good medical calculator — usually by Palm Treo users who are interested in switching. My answer has always been, "No... not yet."

Until now. This week, a third (!) year medical student from the University of Texas published Mediquations, the first medical calculator for the iPhone. For $4.99, it's well worth it. (I can't believe I've had to wait this long to calculate glomerular filtration rates on the iPhone...) Here's an email from Zack Mahdavi, the apps creator. He'd like to hear from you if there are any equations you'd like included in the next version.
I am a third year medical student from The University of Texas Medical Branch (UTMB), a Computer Science major from The University of Texas at Austin, and an avid iPhone user. Apple recently introduced the App Store for the iPhone and iPod Touch that allows developers to build applications for the iPhone. My coworkers have been clamoring for a medical calculator for the iPhone for months, and I knew once the App Store was announced that this is an application I must build.

As a result, I built Mediquations. It is a native iPhone application that does not require an internet connection.

Features include:
- Access to over 40 formulas and scores.
- View the full equation for each formula
- For some equations, view quick reference info and citations.
- Support for US and SI units.
- Built in search to find an equation fast.

The equations available include:
• A-a O2 Gradient
• Absolute Neutrophil Count
• Age
• Anion Gap
• Basal Energy Expenditure (Harris-Benedict Equation)
• Bayesian Sensitivity/Specificity
• Body Mass Index (BMI)
• Body Surface Area (BSA)
• Cardiac Output (Fick)
• Cockcroft Gault GFR
• Corrected QT (QTc)
• Corrected Serum Calcium
• Corrected Serum Phenytoin
• Corrected Serum Sodium
• Fractional Excretion of Sodium
• Framingham Cardiac Risk Score
• Free Water Deficit for Hypernatremia
• Glasgow Coma Scale
• Henderson-Hasselbach Equation
• Hepatitis Discriminant Function
• Ideal Body Weight (IBW)
• LDL Cholesterol Estimation (Friedewald Equation)
• Maintenance Fluids
• Mean Arterial Pressure
• MELD Score
• Osmolality (Serum)
• Osmotic Gap (Stool)
• Parkland Formula
• Peak Flow (predicted)
• PELD Score
• Ranson Criteria
• Reticulocyte Production Index
• Schwartz Pedi GFR
• Temperature Conversion
• Transtubular K Gradient
• Weight Unit Conversion
• Well's Criteria
• Winters' Formula

I am also open to suggestions for other equations, so please let me know if the app is missing anything you’d find useful.

The app costs $4.99 and is available on Apple’s App Store via iTunes or via the App Store application on the iPhone/iPod Touch.

For more information, visit I hope your visitors find it useful!

Take care,
Zack Mahdavi
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About the Author


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