What Creasy score indicates high preterm risk?

Creasy score ≥10 points is high risk for preterm birth. The tool combines socioeconomic risk (low income, age extremes, stress), prior obstetric history (prior PTB most weighted), and current pregnancy factors (multiple gestation, uterine/cervical anomalies).

Is prior preterm birth the strongest risk factor?

Yes. Prior spontaneous preterm birth at <34 weeks increases recurrence risk to 30-50% (compared to 5-15% baseline). Multiple prior PTBs further increase risk. Progesterone prophylaxis is standard for this indication.

What interventions reduce recurrence of preterm birth?

17-OHPC (hydroxyprogesterone caproate) injections weekly from 16-36 weeks (now withdrawn in US after PROLONG trial). Vaginal progesterone preferred. Cerclage for short cervix + prior PTB history. Optimized socioeconomic support and smoking cessation.

Creasy-Herron Preterm Birth Risk Scoring System

Apply the Creasy-Herron scoring system to identify high-risk patients for spontaneous preterm birth. Incorporates socioeconomic factors, past obstetric history, current pregnancy symptoms, and work/activity exposures to calculate preterm birth risk score.

Use the full interactive calculator below, or

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Cervical Length PTB Risk

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Creasy-Herron Preterm Birth Risk Scoring System

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Frequently Asked Questions

What Creasy score indicates high preterm risk?

Is prior preterm birth the strongest risk factor?

What interventions reduce recurrence of preterm birth?