Talking HCG again

In most normal pregnancies at hCG levels below 1,200 mIU/ml the hCG usually doubles every 48-72 hours and it normally increases by at least 60% every two days.

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. Blood hCG levels are not very helpful to test for the viability of the pregnancy if the hCG level is well over 6,000 and/or after 6-7 weeks of the pregnancy. Instead, to test the health of the pregnancy bette at that timer, a sonogram should be done to confirm the presence of a fetal heart beat. Once a fetal heart beat is seen, it is not recommended to check the pregnancy viability with hCG levels.

NORMAL HCG DOUBLING TIMESHCG Levsl DOUBLING TIME EXPECTED
Under 1,200 mIU/ml Between 30 and 72 Hours
1200-6000 mIU/ml Between 72 and 96 Hours
Over 6,000 mIU/ml Over 96 Hours

A normal hCG rise over several days prior to 6 weeks of the pregnancy usually indicates a viable pregnancy. In general, the best indication of a healthy pregnancy other than a normal rise of hCG is a good fetal heartbeat after 6-7 weeks.