For patients with apparent serum hCG concentrations above 15 to 20 IU/L, hCG should also be detectable in urine, if it is truly elevated. Failure to detect urinary hCG in such patients, supports a false-positive serum hCG test. In rare cases, interference due to extremely high titers of antibodies to analyte-specific antibodies, streptavidin or ruthenium can occur. The laboratory should be . Consequently, serum hCG levels as high as 8 IU/L and 15 IU/L may occur in nonpregnant perimenopausal and postmenopausal women, respectively. The hCG level should exceed 20 IU/L for pregnancy to be considered in this age group.. The most sensitive, accurate, and reliable pregnancy test is a blood test for the presence of beta HCG (human chorionic gonadotropin), often just called beta. The HCG is produced by the embryo and is the embryo's signal to the mother that pregnancy has occurred. Beta HCG levels vary according to the gestational age. In a non-pregnant woman . Confirming pregnancy. After you conceive (when the sperm fertilises the egg), the developing placenta begins to produce and release hCG.. It takes about 2 weeks for your hCG levels to be high enough to be detected in your urine using a home pregnancy test.. A positive home test result is almost certainly correct, but a negative result is less reliable.. If you do a pregnancy test on the first . 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 14 weeks the HCG level is among 14,000-62,000 15 weeks . Tableaux de dosage du taux de Béta HCG. Le taux moyen d’HCG chez la femme, hors grossesse et avant la ménopause, est de moins de 8 UI /l. Si le résultat du dosage sanguin est inférieur à 5 .