Thursday, December 11, 2008

iPhone Medical Calculator Throwdown

Which is the best iPhone Medical Calculator?

What criteria do you use to choose?

Price?

Appearance?

Features?

What calculations are included?

Free calculators are great, but if they do not have the calculations you use - not very helpful.

To help everyone sort this out, we created our Great iPhone Medical Calculator Comparison Table!


The Great iPhone Medical Calculator Comparison Table, Version 2, 12/11/2008


iDocTools Medical Calculator MediMath Mediquations
Version1.1
2.011

iPhone Appstore
$4.95
iPhone Appstore
$0.99
iPhone Appstore
$4.99
iPhone Appstore
$4.99
A-a O2 gradient X X X X
Absolute Neutrophil Count X X X X
Anion Gap (Serum) X X X X
Apgar Score X X X X
Basal Energy Expenditure X X X X
Body Mass Index (BMI) X X X X
Body Surface Area (DuBois) X X X X
Cardiac output (Fick) X X X X
Child-Pugh score X X X X
Corrected QT for HR (QTc) X X X X
Corrected Serum Calcium X X X X
Corrected Serum Sodium X X X X
Creatinine Clearance (Cockcroft Gault) X X X X
Fraction Excretion of Sodium (FeNA) X X X X
Framingham Cardiac Risk X X X X
GFR (MDRD) X X X X
Glasgow Coma Scale X X X X
Ideal body weight X X X X
LDL Cholesterol X X X X
Mean arterial pressure X X X X
MELD Score X X X X
Opiates X X X X
Oxygenation index (PaO2 / FiO2) X X X X
Parkland Formula X X X X
Pregnancy calculator X X X X
Ranson Criteria X X X X
Steroid Conversion X X X X
Weight Conversions X X X X
Wells Criteria for PE X X X X
Winter's Formula X X X X
Age
X X X
Alcoholic Hepatitis Discriminant
X X X
Apache II (ICU Scoring)
X X X
Bishop Score (Labor Induction) X
X X
Body Surface Area (Mosteller) X
X X
CHADS Score (AFib Stroke Risk)
X X X
Corrected Serum Phenytoin X
X X
Creatinine Clearance (Measured) X
X X
Delta Gap
X X X
Endotracheal Tube Size X
X X
Goldman Cardiac Risk Index X
X X
Henderson-Hasselbalch equation X
X X
Iron deficit X
X X
IV Infusion Rate
X X X
Maintenance Fluids
X X X
Number Needed to Treat (NNT) X
X X
Osmotic gap (stool) X
X X
PELD Score X
X X
Pneumonia Severity Index (PORT Score)
X X X
Pressure gradient (Bernoulli) X
X X
Pulmonary vascular resistance X
X X
Reticulocyte index X
X X
Systemic vascular resistance X
X X
TIMI Score (STEMI)
X X X
ITIMIScore (Unstable Angina/NSTEMI)
X X X
Transtubular K gradient X
X X
Abbreviated Mental Test Score (AMTS)

X X
ABCD score

X X
ABCD^2 (Restroke Risk)

X X
Alvarado Appendicitis Score

X X
Anion Gap (Urine)

X X
Aortic Valve Area (Continuity)

X X
Aortic Valve Area (Gorlin) X
X
Arterial Oxygen Content

X X
Arterial Oxygen Delivery

X X
Barthel's ADL Index

X X
Berg Balance Scale

X X
Bicarbonate Deficit
X X
Body Surface Area (Haycock) X
X
Body Surface Area (No Height)

X X
Boston Heart Failure Criteria

X X
Carboplatin Dosing

X X
Cardiac Output (CO) X
X
Cardiac Output (Echo) X

X
Change In Serum Sodium (IV Fluids)

X X
Charlson Comborbidity Index

X X
Conception date
X X
Corrected calcium (proteinemia) X
X
Corrected phenytoin (renal) X
X
Creatinine clearance Children (Schwartz) X

X
CURB-65 Pneumonia Mortality

X X
Dermatome Map

X X
Duke Treadmill CAD Stress Score

X X
Fluid requirements for first 24 hours
X X
Fluid requirements for first 8 hours
X X
Fractional Excretion of Urea (FEUrea)
X
X
Free Sodium Deficit for Hyponatremia

X X
Free Water Deficit for Hypernatremia
X
X
Heart Rate from EKG

X X
IV Dose
X X
Kt/V (Daugirdas formula)

X X
Lean Body Weight
X X
Light's Criteria

X X
Maximum Allowable Blood Loss

X X
Mini Mental Status Exam

X X
NIH Stroke Scale

X X
Osmolality (Serum)

X X
Oxygen tank remaining time X
X
Peak Flow (Predicted)

X X
Pediatric Dosing

X X
Pediatric maintenance IV fluids X
X
PERC Rule (PE Rule-out Criteria)
X
X
Salazar-Corcoran CrCl for obese patients

X X
Sensitivity and Specificity (Bayesian)

X X
SIRS Criteria

X X
SOFA score X

X
Spirometric Values (ERS and Crapo) X

X
Temperature Conversion

X X
Umbilical Catheter Insertion Depth

X X
Unit Conversion (Volume) X
X
Urine Output

X X
Valve area by PISA X

X
Water deficit X
X
Wells Criteria for DVT

X X
Wright GFR

X X





Version History

Version 2 - 12/11/08
  • Calculations present in just one calculator are no longer included (to make the list more manageable)
  • Added calculator version numbers
  • Added Appstore links
  • Added prices
  • The version number links go to the full, official calculation listings of the calculators
  • We would also like to thank Evan Schoenberg of MediMath fame for his comments on how to improve this table

Version 1 - Initial publication

4 comments:

Fred Wong said...

I don't think you've included all the calculators from each app.

Also you don't compare usability of the different calculators. Some have input methods that make entry much easier and faster. Some have search features others don't. Some have settings others don't. Some have better/worse reference sections.

The app with the most calculators is not necessarily the best. As a practicing physician, I can tell you that a lot of the calculators provided in these programs is filler.

My advice, download some, try them. Ask your friends and coworkers, and find out which is the best for you.

RR and MB said...

Thank you for your comments. You make some good points.

1. Not all calculations are included in the table - the calculations in just one of the calculators were not listed (to make things more compact)

2. You are correct! The most calculations does not mean the best, there are many other factors such as how easy it is to use a calculator, references, etc.

I did not address these issues because it is very subjective area of comparison.

I will run a usability poll for some additional information, and update the post when there are enough respondents.


3. Also, from the point of view of a full time hospitalist - I only use about 5 calculations on a regular basis (a few more such as correction of serum sodium for glucose on a less frequent basis)

Zack said...

Hello. My name is Zack Mahdavi, and I am the developer for Mediquations.

Thanks for mentioning Mediquations in this chart, but I wanted to let you know that this chart does not correctly represent the equations present in Mediquations. Mediquations consists of 169 useful equations and is by far the most comprehensive medical calculator available on the iTunes Store.

The following equations are included with Mediquations, but are not listed in this chart:

- Aortic Valve Area (Gorlin)
- Berg Balance Scale
- Cardiac Output
- Conception Date
- Corrected Calcium
- Corrected Phenytoin
- IV Dose
- Osmolality (Serum)
- Unit Conversion (Volume)

In addition, there are over 40 other equations included in Mediquations that are not listed in this chart. The full list is available at:

http://mediquations.com/equations.html

Thanks!

Zack Mahdavi
3rd Year Medical Student
University of Texas Medical Branch

Prudencio said...

Is there any med calculator that shows the actual formula being used?