(Arch Dis Child 1996;75:36-41)

of patients with FV Leiden emphasize the need for quality assurance procedures including EQA, and this survey of practice in the field indicates that some laboratories have adopted a testing strategy to avoid lifelong labelling of patients with an inappropriate genetic diagnosis. This brief survey has shown significant variation in practice among laboratories and it is, therefore, an opportune time to develop evidence-based best practice guidelines to ensure uniformity of practice. References 1 Jennings I, Kitchen S, Woods TA, Preston FE. Multilaboratory testing in thrombophilia through the United Kingdom external quality assessment service (blood coagulation) quality assurance program.

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