title: Comparison of antithrombin III, protein C and protein S levels in capillary and venous blood of newborn infants.
abstract: The plasma concentrations of antithrombin III, protein C and protein S in capillary and venous blood samples obtained simultaneously from 30 neonates were compared in order to determine the suitability of using capillary blood for estimation of these proteins with anticoagulant action. Our findings showed that while capillary and venous blood did not differ significantly in antithrombin III functional activity and protein C antigen levels, the capillary samples had significantly lower protein C functional activity and higher antithrombin III antigen level. Protein S antigen level was also significantly higher in the capillary samples although the difference was relatively small. The capillary and venous concentrations of the binding protein of protein S, C4b binding protein, were almost identical.
authors.affiliation: Department of Paediatrics, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin.
authors.forename: T F
authors.initials: TF
authors.lastname: Fok
authors.forename: J A
authors.initials: JA
authors.lastname: Yin
authors.forename: P M
authors.initials: PM
authors.lastname: Yuen
mesh_terms: D000941:Antigens / Q000032:analysis; D000990:Antithrombin III / Q000032:analysis / Q000276:immunology / Q000502:physiology; D001777:Blood Coagulation / Q000502:physiology*; D002196:Capillaries; D002352:Carrier Proteins / Q000097:blood* / Q000276:immunology / Q000502:physiology; D003169:Complement Inactivator Proteins; D006023:Glycoproteins / Q000097:blood* / Q000276:immunology / Q000502:physiology; D006365:Heel / Q000098:blood supply; D006801:Humans; D007231:Infant, Newborn / Q000097:blood*; D011486:Protein C / Q000032:analysis* / Q000276:immunology / Q000502:physiology; D017293:Protein S; D014680:Veins
chemical_list: D000941:Antigens; D002352:Carrier Proteins; D003169:Complement Inactivator Proteins; D006023:Glycoproteins; D011486:Protein C; D017293:Protein S; D000990:Antithrombin III