âThereâs called free circulating DNA, the fetus, some of its DNA gets into the maternal blood and we can actually detect that DNA -- the accuracy of these tests are about 99 percent,â Dr. Abdullah said, âWe can do this test around 10 weeks, so itâs very early in the pregnancy.â.
Daytona International Speedway is 2.5 miles (4 km) long and a 500-mile race requires 200 laps to complete. However, the race is considered official after half its distance (100 laps or 250 miles (400 km)) has been completed.
1 In our 5:00 mile example, most people will run Lap 3 in between 77 to 78 seconds. 2  However, since the first lap was hopefully strong, this puts us almost perfectly at 3:45. 3  Make a conscious effort to keep pace on this lap or else you will fall behind.