Beta hCG is considered a tumor marker, 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 . To calculate beta hcg level chart for twins (multiples chart) and molar pregnancy by DPO in mIU/L of hCG beta-subunit level: In women who are having a multiple pregnancy, twins pregnancy or more it is common for their hCG levels to be 30-50% higher than those with a singleton pregnancy.. Generally a woman’s hCG levels double every 72 hours. hCG levels in pregnancy reach their peak in the first 8-11 weeks of pregnancy and then tend to level off for the next two trimesters. This is why, in the first trimester (3 months) of pregnancy, symptoms can be so much stronger and intense.. Low levels of hCG may be detected in your bloodaround 8 to 11 days after conception. hCG levels are highest towards the end of the first trimester, then gradually decline over the rest of your pregnancy. The average levels of hCG in a pregnant woman’s blood are: non-pregnant women - less than 10 U/L borderline pregnancy result - 10 to 25 U/L. An hCG level of less than 5 mIU/mL is considered negative for pregnancy, and anything above 25 mIU/mL is considered positive for pregnancy. An hCG level between 6 and 24 mIU/mL is considered a grey area, and you’ll likely need to be retested to see if your levels rise to confirm a pregnancy.. An hCG of less than 5 mIU/cc is usually negative, over 25 mIU/cc usually positive, between 5 and 25 mIU/cc it's "equivocal" which simply means we don't know..