title: Changes in the ratio between serum and "specific" levels of human chorionic gonadotropin in different trimesters of pregnancy.
abstract: Sixty-one sera from different trimesters of pregnancy were analyzed by two 125-I-NIH-HCG assay systems, employing anti-intact HCG serum and anti theta-HCG serum, respectively. The ratios of the levels measured in the two assay systems changed with the duration of pregnancy. The ratios during trimesters 1,2, and 3 were 2.94, 1.99, and 2.37, respectively. The cross-reactivity of proteohormones other than HCG was tested in both the assay systems. The two assay systems could be comparable in their high degree of specificity. However, the relative affinities of intact HCG and theta-HCG in the two assay systems were observed to be different. It was suggested that the significant differences in the ratios of the levels measured by the tow assay systems might have been infulenced by the occurrence of theta-HCG in serum and that the levels of the subunit must have changed at different stages of pregnancy.
mesh_terms: D000818:Animals; D006063:Chorionic Gonadotropin / Q000097:blood*; D003429:Cross Reactions; D005260:Female; D005640:Follicle Stimulating Hormone / Q000276:immunology; D006023:Glycoproteins / Q000097:blood; D006801:Humans; D007986:Luteinizing Hormone / Q000276:immunology; D010446:Peptide Fragments; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011262:Pregnancy Trimester, Second; D011263:Pregnancy Trimester, Third; D011863:Radioimmunoassay; D012756:Sheep / Q000276:immunology; D013972:Thyrotropin / Q000276:immunology; D005719:gamma-Globulins
chemical_list: D006063:Chorionic Gonadotropin; D006023:Glycoproteins; D010446:Peptide Fragments; D005719:gamma-Globulins; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D013972:Thyrotropin