Multiple choice

AFP screening can wrongly give results indicating that an embryo has genetic defects if

  1. the date of conception of the women has been miscalculated

  2. the expecting mother is anemic

  3. the expecting mother has Rh negative blood

  4. the expecting mother has Rh positive blood

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A Correct answer
Explanation

Since the amount of AFP in a mother's blood varies with the stage of a pregnancy, a wrong date can mislead a doctor. Similarly, when it is unknown that there are twins, the resulting large amount of AFP will likely be misinterpreted as a problem.

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