Guideline to hCG levels during pregnancy:
hCG levels in weeks from LMP or in gestational age* :
3 weeks LMP: 5 - 50 mIU/ml
4 weeks LMP: 5 - 426 mIU/ml
5 weeks LMP: 18 - 7,340 mIU/ml
6 weeks LMP: 1,080 - 56,500 mIU/ml
7 - 8 weeks LMP: 7, 650 - 229,000 mIU/ml
9 - 12 weeks LMP: 25,700 - 288,000 mIU/ml
13 - 16 weeks LMP: 13,300 - 254,000 mIU/ml
17 - 24 weeks LMP: 4,060 - 165,400 mIU/ml
25 - 40 weeks LMP: 3,640 - 117,000 mIU/ml
These numbers are just a GUIDELINE-- every woman’s level of hCG can rise differently. It is not necessarily the level that matters but rather the change in the level.
Key things to remember about hCG levels:
About 85% of normal pregnancies will have the hCG level double every 48 - 72 hours. As you get further along into pregnancy and the hCG level gets higher, the time it takes to double can increase to about every 96 hours.
Caution must be used in making too much of hCG numbers. A normal pregnancy may have low hCG levels and deliver a perfectly healthy baby.
In general the hCG level will double every 72 hours. The levels will reach their peak in the 8 - 11 weeks of pregnancy (the third month) and then will decline and level off for the remainder of the pregnancy.