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An international standard for low molecular weight heparin. 1988

T W Barrowcliffe, and A D Curtis, and E A Johnson, and D P Thomas
National Institute for Biological Standards and Control, South Mimms, Herts., UK.

An international collaborative study has been carried out with the aim of establishing an international standard for low molecular weight (LMW) heparin. Three preparations of LMW heparin were assayed against the International Standard for unfractionated heparin (UFH) by 25 laboratories in 13 countries, using nine different assay methods. The results confirmed previous findings of non-parallel assays, wide interlaboratory variability and differences between methods when LMW heparins are assayed against a UFH standard. Use of one of the LMW heparins as a standard for the other two gave parallel assays and much closer agreement between laboratories. The preparation in ampoules coded 85/600 was selected as likely to give the best agreement with the largest number of LMW heparins; potencies were assigned by taking the mean of all the anti-Xa assays, and the mean of the thrombin and APTT assays, to represent the two major groups of activities. Preparation 85/600 has been established by WHO as the 1st International Standard for LMW heparin, with potencies of 1,680 iu/ampoule by anti-Xa assays and 665 iu/ampoule by thrombin inhibition and APTT assays.

UI MeSH Term Description Entries
D010602 Pharmacopoeias as Topic Works about authoritative treatises on drugs and preparations, their description, formulation, analytic composition, physical constants, main chemical properties used in identification, standards for strength, purity, and dosage, chemical tests for determining identity and purity, etc. Formulary, National,National Formulary,Formularies, National,National Formularies
D012015 Reference Standards A basis of value established for the measure of quantity, weight, extent or quality, e.g. weight standards, standard solutions, methods, techniques, and procedures used in diagnosis and therapy. Standard Preparations,Standards, Reference,Preparations, Standard,Standardization,Standards,Preparation, Standard,Reference Standard,Standard Preparation,Standard, Reference
D005060 Europe The continent north of AFRICA, west of ASIA and east of the ATLANTIC OCEAN. Northern Europe,Southern Europe,Western Europe
D006113 United Kingdom Country in northwestern Europe including Great Britain and the northern one-sixth of the island of Ireland, located between the North Sea and north Atlantic Ocean. The capital is London. Great Britain,Isle of Man
D006495 Heparin, Low-Molecular-Weight Heparin fractions with a molecular weight usually between 4000 and 6000 kD. These low-molecular-weight fractions are effective antithrombotic agents. Their administration reduces the risk of hemorrhage, they have a longer half-life, and their platelet interactions are reduced in comparison to unfractionated heparin. They also provide an effective prophylaxis against postoperative major pulmonary embolism. LMWH,Low-Molecular-Weight Heparin,Low Molecular Weight Heparin,Heparin, Low Molecular Weight
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000990 Antithrombin III A plasma alpha 2 glycoprotein that accounts for the major antithrombin activity of normal plasma and also inhibits several other enzymes. It is a member of the serpin superfamily. Heparin Cofactor I,Antithrombin III-Alpha,Atenativ,Heparin Co-Factor I,Kybernin,Serpin C1,Thrombate III,Antithrombin III Alpha,Antithrombin IIIAlpha,Cofactor I, Heparin,Heparin Co Factor I
D012697 Serine Endopeptidases Any member of the group of ENDOPEPTIDASES containing at the active site a serine residue involved in catalysis. Serine Endopeptidase,Endopeptidase, Serine,Endopeptidases, Serine
D013917 Thrombin An enzyme formed from PROTHROMBIN that converts FIBRINOGEN to FIBRIN. Thrombase,Thrombin JMI,Thrombin-JMI,Thrombinar,Thrombostat,alpha-Thrombin,beta,gamma-Thrombin,beta-Thrombin,gamma-Thrombin,JMI, Thrombin
D014481 United States A country in NORTH AMERICA between CANADA and MEXICO.

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