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.
The first trimester screening tests are usually done between the 10th and 13th week of pregnancy. They involve measuring the level of certain substances in the mother's blood and obtaining an ultrasound. Genetic screening tests can be done during the second trimester as well.here are no dangers to the mother or the fetus from these screening tests, but positive screening results are not diagnostic. A new screening test done at 10 weeks of pregnancy, called cell-free fetal DNA testing, uses the mother's blood to detect Down syndrome.