A 64-year-old man with multiple sclerosis developed a circulating anticoagulant. Three immunoglobulin fractions (I = IgG; II = IgG+IgA; III = IgM) were separated from patient serum by 33-percent ammonium sulfate precipitation and DEAE-52 cellulose column chromatography. Fractions I (IgG) and II (IgG + IgA) had factor VIII inhibitory activity on incubation. Fraction I (IgG) possessed, in addition, immediate anti-IX activity which did not require incubation. Absorption studies characterized the VIII inhibitors as IgG-χ in fraction I and IgG-χ+IgG-λ in fraction II. Immediately reactive IgG anti-IX antibodies associated with kinetically distinct IgG anti-VIII antibodies have not been described previously.

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