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.
2. A nuchal translucency scan (also called first trimester of pregnancy screening) is carried out during weeks 11â13 of a pregnancy. The scan uses ultrasound to screen for Down syndrome, or other chromosomal or inherited conditions in the foetus.our doctor would recommend a nuchal translucency scan: 1  to confirm the exact date of the pregnancy and the due date; 2  to confirm the number of foetuses (single or multiple); 3  to confirm that the foetus is growing appropriately and appears to be developing normally;