Obstetrum: OB-GYN Calculator

Evidence-based obstetric calculator with 11+ clinical tools. Gestational age dating, fetal weight estimation, obstetric insulin dosing with 7 international guidelines. Powered by ACOG, WHO 2025, and FIGO. This app is not a medical device and does not diagnose, treat, or prevent any condition.

🔬 PRENATAL CARE CALCULATORS

• Gestational Age — ACOG CO 700 dating hierarchy: IVF > 1st trimester CRL USG > LMP > 2nd/3rd trimester USG
• Estimated Fetal Weight — Hadlock 1991 formulas, INTERGROWTH-21st percentiles, p3–p97 classification
• Fundal Height — INTERGROWTH-21st percentiles, weeks 13–40, serial trend curve
• Gestational Weight Gain — IOM guidelines by pre-pregnancy BMI and gestational age
• Fetal Doppler — Umbilical fluxometry, resistance indices, FGR staging
• Insulin in Pregnancy — 7 guidelines: ADA/ACOG, NICE, FIGO, ALAD, ADIPS, CDA, GEDE. GDM + pregestational T1/T2. Corticosteroid protocol. FDA 2026 CDS traceability

⚡ OBSTETRIC EMERGENCIES

• Oxytocin — Induction and augmentation protocols with dose escalation
• Magnesium Sulfate — Zuspan protocol, loading and maintenance dosing
• Bishop Score — Score 0–13, favorable/unfavorable classification, cervical ripening recommendation
• Emergency Algorithms — Clinical decision trees for urgent management

🩸 POSTPARTUM HEMORRHAGE (PPH)

Full module based on WHO 2025 Bundle MOTIVE protocol:
• Obstetric shock index
• Medications with evidence levels A/B/C
• Drug-specific contraindications
• Risk stratification and severity classification

🤰 PERINATAL PERIOD

• VBAC Predictor — 3 models: Grobman 2007, updated Grobman 2021, and Flamm-Geiger

📊 INTERNATIONAL STANDARDS

Every result cites its source. Implemented guidelines: ACOG CO 700, WHO 2025, FIGO, NICE, ADA, ALAD, ADIPS, CDA, GEDE, IOM, Hadlock 1991, INTERGROWTH-21st, Zuspan, Grobman, Flamm-Geiger.

📋 CLINICAL RECORDS

• Patient calculation history with audit trail
• Professional clinical PDF reports with plotted percentiles and physician signature
• Record comparison: side-by-side clinical evolution
• Local database — your data never leaves your device

🔒 TOTAL PRIVACY

Local SQLite database. No remote servers, no mandatory accounts, no cloud sync. Your clinical data stays on your device.

💎 OBSTETRUM PREMIUM

All calculators are available without a subscription. Premium unlocks:
• Unlimited patient records
• Professional clinical PDF reports
• Clinical record comparison
• Ad-free experience

Clinical decision support tool for obstetric healthcare professionals.