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.
Triple or quad screening is done around 15 to 20 weeks of pregnancy. It can help estimate the risk of Down syndrome in the fetus. Quad screening results are abnormal (positive) in almost 80% of Down syndrome cases. Triple screening detects almost as many cases.