title: Use of polyethylene glycol in radioimmunoassay of human placental lactogen.
abstract: We describe a rapid radioimmunoassay for human placental lactogen in biological fluids, with use of polyethylene glycol to separate free from antibody-bound placental lactogen. The standard curve obtained, easily fitted to a logit-log transformation, is useful over a concentration range of 6 to 400 ug/liter. Within-assay variability is 1.97%, between-assay variability 2.20%. The relation is linear when lactogen added is plotted against that accounted for analytically, the actual recovery being 100.26%.
mesh_terms: D000918:Antibody Specificity; D006801:Humans; D010928:Placental Lactogen / Q000032:analysis* / Q000097:blood; D011092:Polyethylene Glycols; D011863:Radioimmunoassay / Q000379:methods
chemical_list: D011092:Polyethylene Glycols; D010928:Placental Lactogen