Abstract
In 1985, serum samples were distributed to 27 laboratories within the UK and Eire with the objective of determining the current state of anti-platelet antibody detection. The sera included five unknown samples for blind assessment and four well-characterized reference reagents. The laboratories involved used a wide range of different methods but the most commonly used techniques were the fluorescent antiglobulin test and the enzyme-linked immunosorbent assay. In the trial, all responding laboratories were able to detect potent anti-platelet alloantibodies but there was a 43% incidence of 'false positive' results with samples which had been designated as inert. There were no apparent differences in performance between assays using fluorescein- or enzyme-labelled antiglobulin reagents or between assays which utilized PFA-treated rather than untreated platelets.
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