Newborn serum beta-hCG concentrations are approximately 1/400th of the corresponding maternal serum concentrations, resulting in neonate beta-hCG levels of 10-50 IU/L at birth. Clearance half-life is approximately 2-3 days. Therefore, by 3 months of age, levels comparable to adults should be reached.. The hCG urine test is normally used as a routine pregnancy test, and it doesn’t measure exactly the total quantity of hCG. It just shows thepresence or absence of hCG. There are home pregnancy tests which can be used to show the presence of hCG in urine and are widely available. 2. Understand the Results of Your Beta hCG Levels Tests. Hcg level chart by week of Gestational Age post LMP in hCG beta subunit IU/L: 2-3 weeks the HCG level is among 10-70 3-4 weeks the HCG level is among 10-750 4-5 weeks the HCG level is among 200-7000 5-6 weeks the HCG level is among 200-32,000 6-8 weeks the HCG level is among 4,000-150,000 8-12 weeks the HCG level is among 64,000-210,000. I'm 29 years old and my baby at 13 week 1 day has 2.1mm NT, free beta-hCG is 183.1 IU/l equivalent to 4.461 MoM, PAPP-A is 5370 IU/l equivalent 1.011 MoM. The adjusted risk is 1:394 for Trisomy 21. Should I take an other test for trisomy 21. PS: I had to take duphaston for 5 days at week 6th because of vagina blood. Thank you so much.. . .