The present invention relates to an antibody, wherein the antibody is specifically reactive with short isoform collagen type XVIII, but does not react with intermediate isoform collagen type XVIII or with long isoform collagen type XVIII. The invention also relates to the use of the antibody in a method of immunoassay for detecting or quantitating short isoform collagen type XVIII, wherein the method may be used to evaluate haemophilic disease.
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