The reliability of the i-STAT clinical portable analyser
- Publication Type:
- Journal Article
- Journal of Science and Medicine in Sport, 2007, 10 (3), pp. 135 - 140
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The purpose of this investigation was to assess the reliability of the i-STAT clinical portable analyser and CG 4+ cartridge measures of blood pH, partial pressures of O 2 (pO 2 ) and CO 2 (pCO 2 ), bicarbonate ([HCO 3- ]), base excess (BE), total carbon dioxide (TCO 2 ), oxygen saturation (sO 2 ) and blood lactate ([BLa - ]) at various exercise intensities. A comparison between [BLa - ] measured by the i-STAT and the Accusport lactate analysers during an intermittent treadmill run was also undertaken. The technical error of measurement (TEM%) at rest, at moderate (200 W) and maximal exercise (over(V, ̇) O 2 max) was acceptable (<15%) for all parameters. The intra-class correlation coefficients for each analyte ranged from weak-to-strong across resting (ICC = 0.19-0.96) and moderate (ICC = 0.30-0.96) exercise intensities. The ICC for all analytes were observed to be strong following maximal intensity exercise (ICC = 0.77-0.95). The comparison of the [BLa - ] measures between the i-STAT and Accusport showed that the difference between measures was acceptable at both low (<4 mmol L -1 ) (-0.39 ± 0.27 mmol L -1 ), moderate to high concentrations (>4 mmol L -1 ) (0.58 ± 1.22 mmol L -1 ), and across all [BLa - ] data (0.36 ± 1.13 mmol L -1 ). In conclusion, the i-STAT clinical analyser and CG 4+ cartridge provides reliable measures of a number of blood parameters across exercise intensities. The [BLa - ] measures from the i-STAT analyser are consistent with that of the Accusport lactate analyser. Crown Copyright © 2006.
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