Pregnancy test (beta-hCG) Microbiology Notes. The routine pregnancy test has a sensitivity of 25 IU/L. The test will become positive 7 - 10 days after conception and by the time of the first missed period levels frequently exceed 100 IU/L. Dilute urine samples (i.e. with a low specific gravity) may not contain a representative levels of hCG, potentially leading to a false negative result. If . Posted 06/06/2018 This is probably as accurate as 50/50 so just for fun really - this article suggests that levels of hcg could be linked to gender www.ncbi.nlm.nih.gov/pubmed/11746159 Apparently free beta hcg closer to 1 MoM and below could indicate boy, more than 1.2 could indicate girls. Human chorionic gonadotropin (hCG) is a glycoprotein hormone (~37 kDa) composed of two noncovalently linked subunits – the α - and β‑chain (~15 and 22 kDa respectively). The protein is produced by trophoblast tissue and serves to maintain the corpus luteum during the early weeks of pregnancy. In addition, it also influences steroid production.. 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 . 17-24 semaines (4-6 mois) Entre 10 000 et 30 000: Au-dela de la 25ème semaine (7-9 mois) Entre 5 000 et 15 000: Pas de grossesse < 15 mUI/mL: Pourquoi prescrire un dosage de l'hormone bêta-HCG ? Si en théorie, pour une grossesse normale, le dosage plasmatique de l'hormone bêta-HCG n'est pas utile, la plupart des maternités recommandent de faire un dosage plasmatique de l'hormone bêta-HCG . Human chorionic gonadotropin (hCG) Hum Reprod 2002; 17:1901-05). They analyzed a total of 774 embryo transfers from 1994 – 1999. Embryo transfer was carried out 2 days after retrieval and the first pregnancy test was scheduled 12 days later (14 days after retrieval). Here is what they found: The median hCG concentration was 126 mIU/mL in viable pregnancies and 31 mIU/mL in non-viable .