In many early pregnancies, the hCG level will double every 31 to 72 hours. As the pregnancy progresses, hCG levels rise and the doubling time increases. In general, after 6-7 weeks of the pregnancy the best indication of a healthy pregnancy is a good fetal heartbeat.SK YOUR HCG QUESTIONS HERE. In most normal pregnancies at hCG levels below 1,200 mIU/ml the hCG usually doubles every 48-72 hours. At levels below 6,000 mIU/ml the hCG levels normally increase by at least 60% every 2-3 days, though increases between 50-60% can sometimes still be seen in normal pregnancies.
Passionate about all things Australian. The ozone layer is 1 to 3 millimeters thick, if compressed. However, the ozone itself is very diffuse, meaning it is spread out over a range of anywhere between 10 and 50 km.
The ozone layer is a region in the Earthâs atmosphere that contains high concentrations of ozone. Ozone is three molecules of oxygen bonded together, and so it has the chemical symbol O 3. The ozone layer contains more than 91% of the ozone in the Earthâs atmosphere.Because it absorbs ultraviolet radiation from the Sun, the ozone layer is vital to the evolution and survival of life on Earth.zone is three molecules of oxygen bonded together, and so it has the chemical symbol O 3. The ozone layer contains more than 91% of the ozone in the Earthâs atmosphere. Because it absorbs ultraviolet radiation from the Sun, the ozone layer is vital to the evolution and survival of life on Earth.