History of Amazon Reveals Original Name and Jeff Bezos' Temper. A number of little-known facts surrounding Amazon's rise as an ecommerce powerhouse are explored in a new book called The Everything Store: Jeff Bezos and the Age of Amazon by Businessweek senior writer Brad Stone, released on Tuesday.
Different screening tests are offered at different times during pregnancy. The screening test for sickle cell and thalassaemia should be offered before 10 weeks. You will be offered screening for Down's syndrome around the time of your dating scan, which happens when you are around 11 to 14 weeks pregnant.
CVS is usually performed between 10 and 13 weeks from your last menstrual period. CVS may be chosen over amniocentesis because it may be performed earlier in the pregnancy. Chorionic villus sampling detects chromosome abnormalities (i.e. Down syndrome) and genetic disorders (i.e. cystic fibrosis.). This test is different from amniocentesis in that it does not allow for testing for neural tube defects. Chorionic villus sampling also provides access to DNA for paternity testing prior to delivery.