Resources for Prenatal Diagnosis About this site: Should you get genetic counseling before conception? What kind of diagnostic tests do you need to detect birth defects? This site answers these questions and more in a series of brochures from the Mountain States Regional Genetic Services Network. (http://www.ahsc.arizona.edu/~msrgsn/topics/cprnat01.htm)   Pluses: Information on environmental and genetic causes for pregnancy complications and birth defects.   Minuses: No search function.   Best feature: Find out when you should have an ultrasound or amniocentesis test in the timetable for prenatal diagnostic procedures.

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