If you have a "vanishing twin" pregnancy, your prenatal screening test might have been a 11-14 week (nuchal translucency) ultrasound followed by Second Trimester Screening (STS). Or you might have had Second Trimester Screening (STS) on its own. Either way, your results are either "screen negative" or "screen positive". 

Choose your result to learn more about what it means and next steps:

Prenatal Screening Ontario does not have access to your results. If your health-care practitioner does not get your results, they can follow up directly with the screening laboratory where the blood work was sent.