Hi! Does anyone know what the obstetric abbreviation IO means? Used in the sentence Posterior Placental Edge is at IO.

Hi! Does anyone know what the obstetric abbreviation IO means? Used in the sentence Posterior Placental Edge is at IO.
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It means that the edge of your placenta is 10cm away from the internal cervix os. ...prosterior, towards the back. So your placenta is positioned towards the back and 10cm from your internal cervix, that's a good thing anything less than 3cm and you run risk of low lying placenta or placenta previa.