# cfDNA PPV Calculator

> cfDNA PPV Calculator (iPhone/iPad app by David Deschamps.)

- Source: https://appshunter.io/ios/app/cfdna-ppv-calculator/id6759178792 (this page in markdown: same URL + `.md`)
- Developer: [David Deschamps](https://appshunter.io/developer/959395502)
- Category: Medical
- Price: Free
- Age rating: 17+
- Requires: iOS 18.4 · 1 MB
- Languages: American English
- Released: 2026-02-17
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/cfdna-ppv-calculator/id6759178792/reviews.md

## What is cfDNA PPV Calculator?

This Cell Free Fetal DNA PPV Calculator estimates positive predictive value (PPV) and negative predictive value (NPV) for prenatal cell-free DNA (cfDNA) screening using Bayesian probability.

Conditions supported:
• Trisomy 21
• Trisomy 18
• Trisomy 13
• Monosomy X (45,X)
• 47,XXY
• 47,XYY
• 47,XXX

For autosomal trisomies, pretest probability may be derived from maternal-age population risk tables (midtrimester risk by age at term). For sex chromosome aneuploidies, pretest probability can be entered as population prevalence (1 in N). Sensitivity and specificity are user-editable to reflect lab-specific performance.

This app is for screening support and educational use. It does not provide a diagnosis. Positive screening results should be confirmed with diagnostic testing and clinical correlation.


## Version history (last 1 release)

### 1.0 — 2026-02-17

No release notes.

## More apps by David Deschamps

- [Perinatal Calculators](https://appshunter.io/ios/app/perinatal-calculators/id959395503)
- [Fetal Growth Trajectory](https://appshunter.io/ios/app/fetal-growth-trajectory/id6759808382)

All apps by David Deschamps: https://appshunter.io/developer/959395502

## Related topics

[cfdna ppv calculator](https://appshunter.io/ios/topics/cfdna-ppv-calculator)

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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 2026-05-19.*