# ObCalc — OB/MFM Clinical Calculators

> OB/MFM Clinical Calculators (iPhone/iPad app by Code Nine Labs LLC.)

- Source: https://appshunter.io/ios/app/obcalc/id983427276 (this page in markdown: same URL + `.md`)
- Developer: [Code Nine Labs LLC](https://appshunter.io/developer/983427275)
- Category: Medical, Utilities
- Price: $2.99
- Age rating: 17+
- Requires: iOS 26.0 · 3 MB
- Languages: American English
- Released: 2015-05-03
- Data updated: 2026-09-03
- User reviews in markdown: https://appshunter.io/ios/app/obcalc/id983427276/reviews.md

## What is ObCalc?

PeriCalc puts the calculators, scoring tools, and reference charts that obstetrics, maternal-fetal medicine, and labor & delivery teams reach for every shift into one fast, offline-first app.

Every formula is sourced to published guidelines (ACOG, SMFM, CMQCC, NICHD) and built as a clinical tool first — clean inputs, clear interpretation, no clutter.

OBSTETRICS
• Bishop Score
• Estimated Due Date — LMP, ultrasound, conception, ovulation, or IVF transfer dating
• Pregnancy Re-dating (ACOG Committee Opinion 700)
• Pregnancy Weight Gain Tracker
• Urine Protein:Creatinine Ratio (UPCR)
• VBAC Success Calculator — Grobman MFMU model with confidence interval

PERINATOLOGY / MFM
• CVR (CPAM Volume Ratio)
• Extremely Preterm Birth Outcome (NICHD)
• Fetal Biometry Suite — Hadlock EFW, long-bone ratios, multi-panel z-scores and percentiles
• Intrauterine Transfusion (IUT) Volume Calculator
• MCA Doppler / PSV for Fetal Anemia
• Neonatal Morbidity Risk
• Ponderal Index
• GDM Insulin Dosing
• Life-Limiting Skeletal Dysplasia Screen
• Twin Discordance
• Umbilical Artery Doppler

GENERAL
• Anion Gap • Apgar Score • BMI • Iron Deficit • Peak Flow
• Gestational Age (date difference)
• Maternal Sepsis Assistant (qSOFA / Sepsis-3)
• CMQCC Sepsis Screen

THROMBOPHILIA
• VTE Anticoagulation Dosing (ACOG Practice Bulletin 196)

GENETICS
• cfDNA PPV/NPV Calculator
• Nuchal Translucency Percentile

WHY CLINICIANS CHOOSE PERICALC
• Offline-first — no connection needed on L&D
• Fast, distraction-free interface — no ads, no tracking
• One-time purchase. No subscription, no account required
• Regularly updated with new tools and guideline changes
• Built-in unit conversion and inline number-pad arithmetic on every input

PeriCalc is a clinical reference tool intended for use by licensed healthcare professionals. It does not replace clinical judgment, and results should be confirmed against current guidelines and your institution's protocols.


## Version history (last 5 releases)

### 3.0.2 — 2026-09-02

This update adds five new tools and rebuilds two:

NEW
• CMQCC Sepsis Screen — the two-step vital-sign/WBC and end-organ-injury screen, alongside the existing qSOFA/Sepsis-3 assistant (now labeled Maternal Sepsis Assistant to avoid confusion with this new tool)
• Life-Limiting Skeletal Dysplasia Screen
• Nuchal Translucency Percentile
• VTE Anticoagulation Dosing (ACOG PB 196)
• Intrauterine Transfusion (IUT) Volume Calculator

UPDATED
• VBAC Success Calculator — refreshed Grobman model implementation
• Fetal Biometry Suite — expanded panels and reference data

Thanks for the detailed clinical feedback that shaped this release — keep it coming.

### 2.3.2 — 2020-01-16

* Bug fixes

### 2.3.1 — 2019-12-11

New calculators:
* CVR Calculator
* Extremely Preterm Birth Outcome
* MCA Peak Systolic Velocity

Added a new main screen with a searchable list of calculators. 

Fixes issues found in the Fetal Biometry calculator.

### 2.2 — 2019-06-20

The latest version contains bug fixes.

### 2.1 — 2019-05-17

* Added new calculator cfDNA PPV/NPV Calculator
* Added tablet support
* Simplified interface for more unified appearance

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## More apps by Code Nine Labs LLC

- [Ficha](https://appshunter.io/ios/app/ficha/id1528225931)
- [ICE-TI](https://appshunter.io/ios/app/ice-ti/id1532652275)

All apps by Code Nine Labs LLC: https://appshunter.io/developer/983427275

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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 2026-09-03.*