How Stuff Works - http://www.howstuffworks.com/prenatal-testing.htm Illustrated narrative describing an assortment of testing decisions.
Prenatal Testing - http://www.w-cpc.org/pregnancy/testing.html Definitions of the following testing procedures: amnioscentesis, ultrasound, chorionic villi sampling, and fetal development.
University of Pennsylvania - http://www.obgyn.upenn.edu/genetics/cvs.html Information regarding chorionic villi sampling.
Antenatal Results and Choices - ARC - http://www.arc-uk.org UK Charity offering information and support for those considering, going through or making decisions based on the results of pre-natal tests.
Perinatology.com - http://www.perinatology.com/genetics/tools.htm Reference for the clinical geneticist.
Mother and Child - http://www.hon.ch/Dossier/MotherChild/common_procedures/chronic_villi.html Discusses purpose and procedure of chorionic villus sampling. Includes list of advantages and disadvantages compared to amniocentesis.
NT Laboratories - http://www.ntdlabs.com/ Offers information on a variety of prenatal tests, including amniocentisis, and the ultra-screen.
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