title: Importance of levonorgestrel dose in oral contraceptives for effects on coagulation.
abstract: Combined oral contraceptives show clear differences in effect on the tissue factor-initiated coagulation test of activated protein C resistance, which is dependent on the presence and dosage of levonorgestrel. Multiphasic levonorgestrol oral contraceptives differ from monophasic contraceptives and resemble third-generation contraceptives.
authors.forename: C
authors.initials: C
authors.lastname: Kluft
authors.forename: M P
authors.initials: MP
authors.lastname: de Maat
authors.forename: L A
authors.initials: LA
authors.lastname: Heinemann
authors.forename: M
authors.initials: M
authors.lastname: Spannagl
authors.forename: W
authors.initials: W
authors.lastname: Schramm
mesh_terms: D020016:Activated Protein C Resistance; D001777:Blood Coagulation / Q000187:drug effects; D003277:Contraceptives, Oral, Combined / Q000494:pharmacology*; D003280:Contraceptives, Oral, Synthetic / Q000494:pharmacology; D005260:Female; D006801:Humans; D016912:Levonorgestrel / Q000008:administration & dosage* / Q000494:pharmacology
chemical_list: D003277:Contraceptives, Oral, Combined; D003280:Contraceptives, Oral, Synthetic; D016912:Levonorgestrel