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ord
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07/01/06 - 01:02 PM             #1

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

A?

Diego Casali
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07/03/06 - 03:13 AM             #2

Predictive values are only affected by prevalence.

So, I would answer C: if prevalence increases, positive predictive value will also increase.


robin082006
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07/03/06 - 08:24 AM             #3

c

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Cedrick
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07/04/06 - 12:05 PM             #4

C

tolito
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07/19/06 - 08:36 PM             #5

C nod

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lq2006
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05/25/07 - 04:54 PM             #6

C prevalence







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