Electrolyte measurements differ between point-of-care and reference analysers in dogs with hypoadrenocorticism

Fowlie, S., Spence, S., Roberts, E. and Ramsey, I.K. (2020) Electrolyte measurements differ between point-of-care and reference analysers in dogs with hypoadrenocorticism. Journal of Small Animal Practice, 61(10), pp. 599-608. (doi: 10.1111/jsap.13205) (PMID:32812242)

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Introduction: Dogs treated for hypoadrenocorticism are monitored through analysis of their blood electrolytes. This is routinely performed with point‐of‐care analysers and doses of medications are adjusted based on the results. Objectives: To investigate the performance of two point‐of‐care analysers (IDEXX Catalyst Dx and IDEXX VetStat) against a reference laboratory method for the measurement of blood sodium, potassium and chloride concentrations, as well as sodium: potassium ratios, in dogs diagnosed with and treated for hypoadrenocorticism. Methods: Forty‐eight dogs were enrolled into a prospective cross‐sectional study. Paired blood samples were taken and tested on two point‐of‐care analysers and at a reference laboratory. Statistical analysis was then performed with Bland‐Altman analysis and Passing‐Bablok regression. The clinical effects of inaccurate electrolyte analysis were investigated. Results: In total, 329 samples were tested on the Catalyst analyser, while another 72 samples were tested on the VetStat. Passing‐Bablok regression identified both proportional and constant bias for some analytes. There was poor agreement between sodium and chloride concentrations on both analysers. Both analysers tended to give higher results than the reference method for all analytes, except for potassium when measured on the VetStat. Clinical Significance: There are inherent differences between the electrolyte concentrations measured by these two point‐of‐care analysers and reference laboratory methods in dogs with hypoadrenocorticism.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Fowlie, Samuel and Ramsey, Professor Ian and Spence, Susanna
Authors: Fowlie, S., Spence, S., Roberts, E., and Ramsey, I.K.
College/School:College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
Journal Name:Journal of Small Animal Practice
ISSN (Online):1748-5827
Published Online:18 August 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Journal of Small Animal Practice 61(10): 599-608
Publisher Policy:Reproduced under a Creative Commons License

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