This hormone is what we look for with a pregnancy test. In general, the HCG level will double every 2-3 days in early pregnancy. 85% of normal pregnancies will have the HCG level double every 72 hours.HCG levels peak at about 8-10 weeks of pregnancy and then decline, remaining at lower levels for the rest of the pregnancy.There is a large variation in a normal HCG level for any given time in pregnancy.ome normal pregnancies will have quite low levels of HCG-and deliver perfect babies. Caution must be used in making too much of HCG numbers. Ultrasound findings after 5-6 weeks of pregnancy are much more predictive of pregnancy outcome than are HCG levels.
The mesosphere is about 40 kilometers thick, a little thicker than the stratosphere. Thermosphere. The thermosphere is the thin-aired fourth layer of the atmosphere. It is considered by some to be the end of Earthâs atmosphere and the start of outer space.eyond the stratosphere is the mesosphere, the fog layer. The air is very thin in the mesosphere but thick enough to burn up meteoroids. In fact, most of the shooting stars that you see are actually meteoroids the size of grains of sand burning up in the mesosphere.
The mesosphere (/ËmÉsoÊsfÉªÉr/ ; from Greek mesos middle and sphaira ball) is the layer of the Earth's atmosphere that is directly above the stratopause and directly below the mesopause. In the mesosphere temperature decreases as the altitude increases. The upper boundary of the mesosphere is the mesopause, which can be the coldest naturally occurring place on Earth with temperatures below 130 K (â226 Â°F; â143 Â°C).