The average quantitative hCG hormone levels in blood tests during the first trimester are:
4 weeks gestation: 5-426 milliunits per millilitre (mIU/mL)
5 weeks: 18-7,340 mIU/mL
6 weeks: 1,080-56,500 mIU/mL
Levels peak between 8-11 weeks of pregnancy, declining subsequently.