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 is a layer of Earth's atmosphere. The mesosphere is above the stratosphere layer. The layer above the mesosphere is called the thermosphere. The mesosphere starts at 50 km (31 miles) above Earth's surface and goes up to 85 km (53 miles) high. As you get higher up in the mesosphere, the temperature gets colder. The top of the mesosphere is the coldest part of Earth's atmosphere. The temperature there is around -90Â° C (-130Â° F)! The boundaries between layers in the atmosphere have special names. The mesopause is the boundary between the mesosphere and the thermosphere above it.