Beta hCG levels may also be raised by some ovarian neoplasms (e.g. , ), as well as in 8. See alsoQuiz questionsTo quiz yourself on this article, log in to see multiple choice questions. Log inReferences1. Polonsky KS, FRCP PRLMDFACP et-al. Williams Textbook of Endocrinology. Saunders. ISBN:1437703240. - 2. Kadar N, DeVore G, Romero R. Discriminatory hCG zone: its use in the sonographic evaluation for ectopic pregnancy. Obstet Gynecol. 1981;58 (2): 156-61. 3. Doubilet PM, Benson CB. Further evidence against the reliability of the human chorionic gonadotropin discriminatory level. J Ultrasound Med. 2012;30 (12): 1637-42. 4. Daya S. Human chorionic gonadotropin increase in normal early pregnancy. Am. J. Obstet. Gynecol. 1987;156 (2): 286-90. 5. Davies S, Byrn F, Cole LA. Human chorionic gonadotropin testing for early pregnancy viability and complications. Clin. Lab. Med. 2004;23 (2): 257-64, vii. 6. Konrad G. First-trimester bleeding with falling HCG: don't assume miscarriage. Can Fam Physician. 2007;53 (5): 831-2. - 7. Yoshimura M, Hershman JM. Thyrotropic action of human chorionic gonadotropin. Thyroid. 1996;5 (5): 425-34. 8. Milose JC, Filson CP, Weizer AZ et-al. Role of biochemical markers in testicular cancer: diagnosis, staging, and surveillance. Open Access J Urol. 2014;4: 1-8. - - Related Radiopaedia articles. Human chorionic gonadotropin (hCG) is a hormone produced by the placenta after implantation. The presence of hCG is detected in some pregnancy tests (HCG pregnancy strip tests).. Beta-hCG (bHCG) is a sex hormone found in the mother's blood serum that can be used to help interpret obstetric ultrasound findings. Beta-hCG levels may be used in three ways in the clinical setting of pregnancy:.