Abstract
This paper announces the availability of the first international standard for anti-double-stranded DNA (anti-dsDNA). The material, coded Wo/80, was obtained after recalcification of plasma taken from a patient with systemic lupus erythematosus. Vials were filled with 500 microliters serum and freeze dried. The serum contains no other autoantibodies in measurable quantities. The vials should be stored at -20 degrees C. The standard should be used for establishing national, regional, or local standards. In eight laboratories satisfactory results with the immunofluorescence technique on Crithidia luciliae were obtained; the titres varied between 1/20 and 1/640 (mean 1/160). In seven laboratories the Farr assay, with the so called 'Amersham kit', was performed. At a dilution of 1:40 a mean binding percentage of about 50% was observed. After reconstitution with 500 microliters of distilled water, the vial contains 100 IU/500 microliters or 200 IU/ml. The standard can be obtained from the custodian of WHO: Central Laboratory of the Netherlands Red Cross Blood Transfusion Service, PO Box 9190 1006 AD Amsterdam, The Netherlands.
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Selected References
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- CEPPELLINI R., POLLI E., CELADA F. A DNA-reacting factor in serum of a patient with lupus erythematosus diffusus. Proc Soc Exp Biol Med. 1957 Dec;96(3):572–574. doi: 10.3181/00379727-96-23544. [DOI] [PubMed] [Google Scholar]
- Tydeman M. S., Kirkwood T. B. Design and analysis of accelerated degradation tests for the stability of biological standards I. Properties of maximum likelihood estimators. J Biol Stand. 1984;12(2):195–206. doi: 10.1016/s0092-1157(84)80054-2. [DOI] [PubMed] [Google Scholar]