35 year old woman at 18 weeks gestation has an increased se

Discussion in 'USMLE STEP 1' started by Guest, Jul 16, 2006.

  1. Guest

    Guest Guest

    a 35 year old woman at 18 weeks gestation has an increased serium alpha fetoprotein concentration. Which of the following has the greatest influence in determining the predictive value of this test for neural tube defects?

    a)concentration of alpha fetoprotein in maternal serum
    B)maternal history of monozygotic twin pregnancies
    C)prevalence of neural tube defects in the population in question
    D)sensitivity of the test
    E)specificity of the test

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