Assess Stillbirth Risk Factors
Enter maternal characteristics and pregnancy complications to quantify risk relative to the general population. Values are approximations based on published associations.
Use pre-pregnancy or first prenatal visit BMI.
Estimated absolute risk
0.40%
≈ 4.0 per 1000 births
Risk category
Baseline risk
Suggested interventions
- Maintain routine prenatal visits, kick counts, and evidence-based lifestyle habits.
How to Use This Calculator
Collect key maternal risk factors
Gather history of prior stillbirth, hypertension, diabetes, smoking, IVF, and fetal growth issues.
Enter current pregnancy complications
Update risk estimate if growth restriction or twin pregnancy develops.
Develop a follow-up plan
Use results to prioritize antenatal testing, counseling, and modifiable risk factor interventions.
Formula
Absolute risk (%) = Baseline risk (0.35%) + Σ risk multipliers (in percentage points) for each factor:
• Age ≥35 (+0.12%), ≥40 (+0.30%)
• BMI 30–34.9 (+0.12%), 35–39.9 (+0.20%), ≥40 (+0.30%)
• Nulliparity (+0.05%), Smoker (+0.18%), Chronic hypertension (+0.25%), Diabetes (+0.20%)
• Previous stillbirth (+0.80%), FGR (+0.50%), Multiple gestation (+0.40%), IVF (+0.10%)
Full Description
Stillbirth risk is multifactorial. Maternal age, obesity, hypertension, diabetes, smoking, previous stillbirth, fetal growth restriction, assisted reproduction, and multiple gestation increase risk. This calculator approximates absolute risk to aid counseling; it is not a validated prediction model. Clinical decisions should consider race/ethnicity, socioeconomic determinants, prenatal care access, and genetic conditions. Implement evidence-based risk reduction: optimize chronic disease management, encourage smoking cessation, prescribe low-dose aspirin when indicated, and schedule antenatal testing for high-risk pregnancies.
Frequently Asked Questions
Is this calculator a validated risk model?
No. It synthesizes risk contributions from population studies to provide directional guidance. Use alongside validated tools when available.
How often should I reassess risk?
Reassess when new complications arise (e.g., growth restriction, hypertension) or lifestyle factors change.
Can risk be reduced?
Yes. Smoking cessation, weight management, aspirin prophylaxis, tight glucose/BP control, and fetal movement awareness reduce risk.
When should delivery be considered?
High-risk patients may benefit from delivery at 37 weeks or earlier, guided by maternal-fetal medicine consultation and fetal testing results.