Hello, I would be happy to help you with your question.
When you state "1 in 8" percent chance of Down's, you are implying that there is a 12.5% chance of a Down's pregnancy
. It does not seem possible that this could be the final result of the entire screen. Are you saying this based on a lab value alone?? The first trimester screen involves a calculation that includes Papp-A, free beta-HCG
, and the nuchal translucency. They are not usually looked at individually. Of the beta-HCG and Papp-A levels, the only one with true clinical relevance on its own is the Papp-A. In patients where it is
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