# WUSM OB Calc

> Clinical decision support tool for OBGYNs and emergency medicine professionals. (iPhone/iPad app by Washington University in St. Louis.)

- Source: https://appshunter.io/ios/app/wusm-ob-calc/id600123897 (this page in markdown: same URL + `.md`)
- Developer: [Washington University in St. Louis](https://appshunter.io/developer/431339390)
- Category: Medical, Education
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 17+
- Requires: iOS 7.0 · 1 MB
- Languages: American English
- Released: 2013-03-20
- Data updated: 2026-06-24
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/wusm-ob-calc/id600123897/reviews.md

## What is WUSM OB Calc?

There are few clinical decision support tools available for OBGYNs. Those that exist remain web-based and have little value beyond gestational age or Bishop score calculation. To compliment our WUSM OB GUIDE, we introduce the WUSM OB CALC, which provides instant clinical support for five common areas:
1) Determining a patient’s success rate for VBAC 
2) Determining the risk for Down syndrome based on the presence of ultrasound markers 
3) Management for pregnancy of unknown location 
4) Body surface area calculation and methotrexate dosing   
5) Intrauterine growth restriction calculation and management

As with the WUSM OB GUIDE, the data to support these models are evidence based and are drawn from the literature and expert opinion.  Ultrasound technicians, triage nurses and providers of ALL levels will find this tool useful, not just in OBGYN but also in emergency medicine. 

Copyright 2013:
The WUSM OB Calculator is a copyrighted instrument of Washington University, St. Louis , Missouri and the developer Muhammad H. Alsharif.

Permission Statement:
Washington University grants permission to use and reproduce the WUSM OB Calculator exactly as it appears here without modification or editing of any kind solely for end user use in clinical care or research in clinical care or research (the “Purpose”). For the avoidance of doubt, the Purpose does not include the (i) sale, distribution or transfer of the WUSM OB Calculator or copies thereof for any consideration or commercial value; (ii) the creation of any derivative works, including translations; and/or (iii) use of the WUSM OB Calculator as a marketing tool for the sale of any drug. 

Disclaimer:
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, OR THAT THE USE OF THE SOFTWARE WILL NOT INFRINGE ANY PATENT COPYRIGHT, TRADEMARK, OR OTHER PROPRIETARY RIGHTS ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Medical Contributors:
Dr. Anthony Shanks, MD, Assistant Professor, Maternal Fetal Medicine 
Dr. Kenan Omurtag, MD, Fellow, Reproductive Endocrinology and Infertility

Medical References:

VBAC calculator:
Grobman WA, et al. Development of a nomogram for prediction of vaginal birth after cesarean delivery. Obstet Gynecol. 2007;109:806-12.

Down Syndrome:
Nyberg DA et al. Isolated Sonographic Markers for Detection of Fetal Down Syndrome in the Second trimester of pregnancy. 2001;20:1053-63.

Ectopic Calculator:
Condous G, Okaro E, Khalid A, Bourne T. Do we need to follow up complete miscarriages with serum human chorionic gonadotrophin levels? BJOG 2005;112:827- 829.
Barnhart KT, Sammel MD, Gracia CR, Chittams J, Hummel AC, Shaunik A. Risk factors for ectopic pregnancy in women with symptomatic first- trimester pregnancies. Fertil Steril 2006;86:36-43.
Barnhart KT. Clinical practice. Ectopic pregnancy. 2009;361:379-87
Barnhart KT, Sammel MD, Rinaudo PF, Zhou L, Hummel AC, Guo W. Symptomatic patients with an early viable intrauterine pregnancy: HCG curves redefined. Obstet Gynecol 2004;104:50-5
Additional – See in app data

BSA /MTX Calculator:
The Mosteller Formula: http://www.halls.md/body-surface-area/refs.htm
ACOG Practice Bulletin. Medical management of ectopic pregnancy. Obstet Gynecol 2008; 111:1479-85.

## Key features

- VBAC success rate determination
- Down syndrome risk assessment
- Pregnancy of unknown location management
- Body surface area and methotrexate dosing
- Intrauterine growth restriction calculation


## Frequently asked questions about WUSM OB Calc

### What medical calculations does WUSM OB Calc offer?

WUSM OB Calc provides instant clinical support for five common areas: VBAC success rate, Down syndrome risk based on ultrasound markers, management for pregnancy of unknown location, body surface area and methotrexate dosing, and intrauterine growth restriction calculation and management.

### Who developed WUSM OB Calc?

WUSM OB Calc is a copyrighted instrument of Washington University, St. Louis, Missouri, and was developed by Muhammad H. Alsharif.

### Is WUSM OB Calc available on Android devices?

Based on the provided data, WUSM OB Calc is supported on iPhone, iPad, and iPod devices. Information regarding Android compatibility is not available.

### How frequently is WUSM OB Calc updated?

The latest version of WUSM OB Calc is 1.6, which was last updated on December 19, 2014. The app was initially released on March 20, 2013.

### What is the age rating for WUSM OB Calc?

WUSM OB Calc has an age rating of 17+, indicating it is intended for mature users due to its medical content.

### Does WUSM OB Calc have ads?

No, WUSM OB Calc does not contain advertisements. The application is free to use without any ad interruptions.

### What is the user rating for WUSM OB Calc?

WUSM OB Calc has a perfect rating of 5.0 stars based on one review. This suggests a highly positive user experience from the available feedback.

### Can I use WUSM OB Calc for commercial purposes?

Washington University grants permission to use and reproduce WUSM OB Calc for end-user clinical care or research. However, it explicitly prohibits sale, distribution for commercial value, creation of derivative works, or use as a marketing tool for drug sales.

## Version history (last 4 releases)

### 1.6 — 2014-12-19

This app has been updated by Apple to display the Apple Watch app icon.

- Fixed bug with VBAC calculator on iPad devices

### 1.5.1 — 2014-05-12

Fixed a bug that caused problems entering data in some fields while using an iPad.

### 1.5 — 2014-04-09

- Made app universal for iPhone and iPad
- Updated for iOS 7
- Added new icon

### 1.0 — 2013-03-20

No release notes.

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All apps by Washington University in St. Louis: https://appshunter.io/developer/431339390

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-24.*