Sending material at regular intervals to laboratories that perform immunophenotyping of leukaemias and lymphomas showed a large variety in the percentage of positive cells between the different laboratories but an agreement in diagnosis of more than 90%. Each laboratory used his own methods but antibody panels and guide-lines for interpretation were standardised. Studies are in progress to answer the question if standardisation in flow cytometry will result in more comparable results.
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Veer et al. (1994) studied this question.
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