Placenta Accreta Spectrum Diagnosis and Risk Score

Calculate placenta accreta spectrum (PAS) risk using prior cesarean count, placenta previa, prior uterine surgery, and ultrasound findings. PAS risk rises to 40-67% with anterior previa and 3+ prior cesareans.

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Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Calculate placenta accreta spectrum (PAS) risk using prior cesarean count, placenta previa, prior uterine surgery, and ultrasound findings. PAS risk rises to 40-67% with anterior previa and 3+ prior cesareans

Each component has a specific meaning:

  • Prior cesarean count — The prior cesarean count recorded for the scenario being assessed.
  • Placenta previa — The placenta previa recorded for the scenario being assessed.
  • Prior uterine surgery — The prior uterine surgery recorded for the scenario being assessed.
  • Ultrasound findings — The ultrasound findings recorded for the scenario being assessed.

Note: Interpret the placenta accreta risk result against the thresholds and context described above.

How to Use

Enter the prior cesarean count, placenta previa, prior uterine surgery, ultrasound findings for the scenario you are assessing. Calculate placenta accreta spectrum (PAS) risk using prior cesarean count, placenta previa, prior uterine surgery, and ultrasound findings. PAS risk rises to 40-67% with anterior previa and 3+ prior cesareans. Use the placenta accreta risk result to inform your calculation.

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Frequently Asked Questions