Currents move ocean water horizontally at the ocean's surface. Surface currents are driven mainly by the wind. Other forces such as the Coriolis effect and the location of landmasses do affect surface current patterns. The Coriolis Effect explains how the earth's spin causes the wind to curve.
The first blood test is done by taking a small amount of blood from your arm from 10 weeks to 13 weeks 6 days in pregnancy. Nuchal translucency ultrasound: The second step for Sequential Integrated Screening is a special ultrasound done from 11 weeks 2 days to 14 weeks 2 days of the pregnancy. This ultrasound measures the size of the nuchal translucency (NT) of the fetus.
Integrated screening looks at the results of the first-trimester blood test, the NT measurement, and the second-trimester quadruple screen. It gives you a single assessment of your risk after all of these screening tests are completed. Integrated screening detects 94 to 96 percent of Down syndrome cases. If the NT scan is not available, you may have serum integrated screening, which looks at the results of the blood tests from the first and second trimesters.