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This article is from the Pregnancy Screening FAQ, by Lynn Gazis-Sax (gazissax@netcom.com) with numerous contributions by others.

1b. Is there a certain time sequence that the tests should be done wrt conception and pregnancy?

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From Robbrenner@aol.com (Robert Brenner MD):

1b. Blood testing for immunity to Rubella and Tay-Sachs testing should
be done prior to conception. Blood testing for HIV and sickle cell
can be done either prior to or after conception. Serum
alpha-fetoprotein and triple screen for Down syndrome are done at
16-18 weeks. The ideal time to pick up structural congenital
anomalies on ultrasound is 16-18 weeks.
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• prev: 1a. Why are certain tests suggested for a specific sub-population, eg Tay-sachs for European Jews; toxoplasmosis for cat-owners; Downs for over-35 y.o.
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• next: 1c. What are some further sources of information about prenatal tests?

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children, child, kid, amniocentesis, pre-pregnancy and pregnancy test, afp screen and the triple screen, ultrasound