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.
Chorionic villus sampling (CVS). In CVS, cells are taken from the placenta and used to analyze the fetal chromosomes. Typically performed in the first trimester, after 10 weeks of pregnancy, this test appears to carry a somewhat higher risk of miscarriage than second trimester amniocentesis.