Obstetrics medical calculators
All 9 Obstetrics medical calculators on DocMath, A–Z. All specialties
- Gestational diabetes diagnosis (Diabetes Canada / SOGC)Applies the Diabetes Canada 2018 and SOGC No. 393 thresholds at 24–28 weeks: preferred two-step (50-g GCT, then 75-g OGTT) or alternative one-step 75-g OGTT.
- IOTA Simple Rules (adnexal mass)Classifies an adnexal mass on transvaginal ultrasound as benign, malignant or inconclusive from five benign (B) and five malignant (M) features.
- miniPIERS (hypertensive disorders of pregnancy)Predicted risk of an adverse maternal outcome within 48 hours of admission in a hypertensive disorder of pregnancy, from clinical signs and symptoms only (no laboratory tests).
- Modified Bishop score (SOGC 2023)Pre-induction cervical assessment with the SOGC modified Bishop score (cervical length replaces effacement; each item 0–2, maximum 10).
- Modified Ferriman–Gallwey hirsutism score (mFG)Visual score of terminal hair growth in nine androgen-sensitive body areas (0–4 each, total 0–36), interpreted with the population-specific cut-offs of SOGC No. 444 (2023), or the 4–6 range of the 2023 International PCOS Guideline when the population is not listed.
- PCOS diagnosis (2023 International guideline, Rotterdam-based)Applies the 2023 International Evidence-based PCOS Guideline diagnostic criteria (built on Rotterdam 2003): two of ovulatory dysfunction, hyperandrogenism and polycystic ovarian morphology (ultrasound or AMH in adults), after excluding other causes.
- Pregnancy due date and gestational ageEstimated date of delivery (EDD) from the last menstrual period (Naegele, LMP + 280 days) or from a dating ultrasound, with gestational age on a given date.
- Risk of Malignancy Index (RMI I, adnexal mass)RMI = ultrasound score × menopausal score × serum CA-125 (Jacobs 1990); triage of an adnexal mass for gynecologic oncology referral.
- sFlt-1/PlGF ratio interpretation (suspected preeclampsia)Interprets an Elecsys (Roche) sFlt-1/PlGF ratio in suspected preeclampsia: short-term rule-out (≤38) and gestation-specific rule-in cut-offs (85 before 34 weeks, 110 from 34 weeks).