What is the OR for gestational diabetes with obesity?

BMI 30-34.9: OR ~2.5 for GDM. BMI 35-39.9: OR ~4. BMI 40+: OR ~6-8 vs normal BMI. Every 1 kg/m2 increase in BMI above 22 increases GDM risk by ~0.9%.

What is the VTE risk in obese pregnant women?

Obesity (BMI 30+) triples VTE risk in pregnancy (from 0.5-1 to 1.5-3 per 1,000). BMI 40+ increases risk 5-10 fold. RCOG/ACCP recommend antenatal LMWH prophylaxis for BMI 40+ or BMI 30+ with additional risk factors.

Should bariatric surgery affect obstetric management?

Post-bariatric pregnancy: risk of IUGR and preterm birth. Glucose challenge test inaccurate post-RYGB (dumping syndrome); use HbA1c and fasting glucose instead. Supplement iron, folate, B12, calcium, vitamin D. Serial growth ultrasound recommended.

Maternal Obesity Obstetric Complication Risk Calculator

Estimate obstetric complication risk from pre-pregnancy BMI. Quantifies adjusted odds ratios for gestational diabetes, preeclampsia, cesarean, shoulder dystocia, macrosomia, postpartum hemorrhage, and VTE for BMI 30-50+.

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