Creatine kinase concentration was measured via a fingertipblood sample. A sample of 30 L capillary blood was collected intoa heparinised capillary tube and pipetted onto a test strip.1Theblood sample was analysed by Reflotron machinery (Roche Diag-nostics, Australia) for the determination of plasma [CK].
Capillaryblood analysed using this method displays an intra-assay reliabil-ity of