To illustrate the limitations of looking at a single measurement, here is a sample reference list for HCG levels in singleton pregnancies, based on days past ovulation (DPO): * At 14 DPO, the average HCG level is 48 mIU/ml, with a typical range of 17-119 mIU/ml.. Hi, I am concerned about my hcg levels. They are 3/30 562 4/1 755 4/5 1695 4/8 2650 My progesterone was also low but I am on supplements and now it is at 1570. I had heavy bleeding 2 weeks ago and my doc told me I would miscarry, but my levels have continued to go up and the first US on 4/1 showed a sac.. By 6 to 7 weeks beta hCG levels may take as long as 3 1/2 days to double . hCG normally reaches a peak level at about 8 to 10 weeks and then declines for the remainder of the pregnancy.. Beta hCG is considered a , which means it’s a substance that’s excreted by some kinds of tumors. That’s why, in some cases, the hCG blood test may also be used to evaluate and manage certain . . .