Obstetrum: OB-GYN Calculator
Leonel Pimentel
11 active obstetric calculators — updated 2026. Insulin dosing with 7 international guidelines (ADA/ACOG, NICE, FIGO, ALAD, ADIPS, CDA, GEDE). PPH with WHO 2025 protocol. VBAC with 3 predictive models. ACOG CO 700 gestational dating. 100% local data. Most obstetric calculator apps on the market stopped being updated between 2014 and 2021. Obstetrum maintains current clinical guidelines — including the WHO 2025 PPH protocol and FDA 2026 CDS traceability in the insulin module. PRENATAL CARE • Gestational age — ACOG CO 700 dating hierarchy (IVF > 1st trim CRL USG > LMP > 2nd/3rd trim USG) • Estimated fetal weight — Hadlock 1991, INTERGROWTH-21st percentiles (p3–p97) • Fundal height — INTERGROWTH-21st, weeks 13–40, serial trend curve • Gestational weight gain — IOM guidelines by pre-pregnancy BMI • Fetal Doppler — Umbilical fluxometry, resistance indices, FGR staging • Insulin in pregnancy — 7 guidelines: ADA/ACOG, NICE, FIGO, ALAD, ADIPS, CDA, GEDE. GDM and pregestational T1/T2 diabetes. No other app offers multi-guideline obstetric insulin dosing. OBSTETRIC EMERGENCIES • Oxytocin — Induction and augmentation protocols • Magnesium sulfate — Zuspan protocol, loading and maintenance • Bishop score — Score 0–13, favorability and ripening recommendation • Postpartum hemorrhage — WHO 2025 Bundle MOTIVE, shock index, evidence levels A/B/C PERINATAL PERIOD • VBAC predictor — Grobman 2007, updated Grobman 2021, and Flamm-Geiger CLINICAL RECORDS & PDF Patient calculation history, professional PDF reports with plotted percentiles, record comparison, physician signature. PRIVACY Local SQLite database. No remote servers. No cloud sync. No mandatory accounts. PREMIUM — all calculators are accessible without subscription • Unlimited records, PDF reports, record comparison, ad-free Not a regulated medical device. Clinical decision support tool for healthcare professionals. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/