title: Influence of antisera on the estimations of norethisterone and levonorgestrel.
mesh_terms: D003429:Cross Reactions; D005260:Female; D006801:Humans; D007106:Immune Sera; D009640:Norethindrone / Q000097:blood*; D009644:Norgestrel / Q000097:blood*; D011863:Radioimmunoassay / Q000379:methods; D013237:Stereoisomerism
chemical_list: D007106:Immune Sera; D009644:Norgestrel; D009640:Norethindrone