<prompt> HCG secreted from:PlacentaPancreasLungLiver  <response>: Ans A. Placenta hCG is produced by the syncytiotrophoblast of the placenta. Its value reach maximum levels ranging 100 IU 200 IUml bw 60-70 days of pregnancy.It can be detected in the material serum or urine as early as 8-9 days following ovulation.The rescue maintenance of corpus luteum till 6 wk ofpregnancy is the major biological function of hCG- Dutta obstetrics 6th 58It can be measured by radioimmunoassay detected in blood as early as 6 davs after conception Ganong 22th 449Hormone produced by cvtotrophoblastIt produces hypothalamus kike releasing factors; Corticotrophin releasing hormone CRH Gonadotrophin releasing hormone GnRH Growth hormone releasing hormone Gjrh Thyrotrophin releasing hormone TRHOther Neuropeptide YHormones produced by syncytiotrophoblastProtein hormone HCG Human placental lactogen-HPL - Human chorionic thyrotropin HCT Pregnancy specific 3-1 glycoprotein PS3G Pregnancy associated plasma protein A PAPPAGrowth factors Inhibin Activin Transforming growth factor p Epidermal growth factorSteroid hormones: Estrogen ProgesteroneOther: Relaxin also secreted by corpus luteum deciduas.hCG: Review of facts It is a glycoprotein-1 consisting of a hormone non-specific a hormone specific b subunit. hCG is chemically Si functionally similar to pituitary luteinising hormone. The a subunit is biochemically similar to LH, FSH TSH where as the b subunit is relatively unique to hCG. It is produced by the syncytiotrophoblasf3 of the placenta and secreted into the blood of both mother fetus Half life of hCG is about 24 hours By radioimmunoassay it can be detected in the maternal serum or urine as early as 8-9 days following ovulation. In early pregnancy, the doubling time of hCG concentrations is plasma is 1.4-2 days3. The blood urine values reach maximum levels ranging 100 IU 200 lUml bw 60-70 days of pregnancy It is commercially obtained from the urine of pregnant women- Shaws Gynaecology 14th137 The rescue maintaince of corpus luteum till 67 weeks of pregnancy is the major biological function of hCG. 