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Whole blood viscosity issue VIII: Comparison of extrapolation method with diagnostic digital viscometer

BACKGROUND: The first issue of this series proposed extrapolation chart with conventional reference range and suggested comparison of results with other methods. AIM: This work sets out to compare interpretative results from the extrapolation method with those from a digital viscometer method. MATER...

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Autores principales: Nwose, Ezekiel Uba, Richards, Ross Stuart
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Medknow Publications & Media Pvt Ltd 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3336883/
https://www.ncbi.nlm.nih.gov/pubmed/22540108
http://dx.doi.org/10.4297/najms.2011.3333
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author Nwose, Ezekiel Uba
Richards, Ross Stuart
author_facet Nwose, Ezekiel Uba
Richards, Ross Stuart
author_sort Nwose, Ezekiel Uba
collection PubMed
description BACKGROUND: The first issue of this series proposed extrapolation chart with conventional reference range and suggested comparison of results with other methods. AIM: This work sets out to compare interpretative results from the extrapolation method with those from a digital viscometer method. MATERIALS AND METHODS: Five cases in our archived clinical pathology database that were specifically tested for whole blood viscosity by the digital method, and had results for haematocrit and serum proteins were pooled. The values of haematocrit and serum proteins were used to derive extrapolated values. The interpretative results of the extrapolation method were compared with those of digital viscometer-based clinical reports. Non-Newtonian fluids such as whole blood have different viscosities at different shear rates. Comparative statement can only be based on interpreted outcome. RESULTS: Two-fifth absolute concordance and one-fifth discordance is observed between extrapolation and viscometer-based clinical reports. The discordance is a case of hyperviscosity in the presence of neither hyperproteinaemia nor polycythemia. CONCLUSION: The extrapolation method may underestimate whole blood viscosity in some patients when compared with digital viscometer, which in turn may suggest hyperviscosity that cannot be explained by hyperproteinaemia or polycythemia concepts. The impact of oxidative stress is highlighted.
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spelling pubmed-33368832012-04-26 Whole blood viscosity issue VIII: Comparison of extrapolation method with diagnostic digital viscometer Nwose, Ezekiel Uba Richards, Ross Stuart N Am J Med Sci Technical Article BACKGROUND: The first issue of this series proposed extrapolation chart with conventional reference range and suggested comparison of results with other methods. AIM: This work sets out to compare interpretative results from the extrapolation method with those from a digital viscometer method. MATERIALS AND METHODS: Five cases in our archived clinical pathology database that were specifically tested for whole blood viscosity by the digital method, and had results for haematocrit and serum proteins were pooled. The values of haematocrit and serum proteins were used to derive extrapolated values. The interpretative results of the extrapolation method were compared with those of digital viscometer-based clinical reports. Non-Newtonian fluids such as whole blood have different viscosities at different shear rates. Comparative statement can only be based on interpreted outcome. RESULTS: Two-fifth absolute concordance and one-fifth discordance is observed between extrapolation and viscometer-based clinical reports. The discordance is a case of hyperviscosity in the presence of neither hyperproteinaemia nor polycythemia. CONCLUSION: The extrapolation method may underestimate whole blood viscosity in some patients when compared with digital viscometer, which in turn may suggest hyperviscosity that cannot be explained by hyperproteinaemia or polycythemia concepts. The impact of oxidative stress is highlighted. Medknow Publications & Media Pvt Ltd 2011-07 /pmc/articles/PMC3336883/ /pubmed/22540108 http://dx.doi.org/10.4297/najms.2011.3333 Text en Copyright: © North American Journal of Medical Sciences http://creativecommons.org/licenses/by-nc-sa/3.0 This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Technical Article
Nwose, Ezekiel Uba
Richards, Ross Stuart
Whole blood viscosity issue VIII: Comparison of extrapolation method with diagnostic digital viscometer
title Whole blood viscosity issue VIII: Comparison of extrapolation method with diagnostic digital viscometer
title_full Whole blood viscosity issue VIII: Comparison of extrapolation method with diagnostic digital viscometer
title_fullStr Whole blood viscosity issue VIII: Comparison of extrapolation method with diagnostic digital viscometer
title_full_unstemmed Whole blood viscosity issue VIII: Comparison of extrapolation method with diagnostic digital viscometer
title_short Whole blood viscosity issue VIII: Comparison of extrapolation method with diagnostic digital viscometer
title_sort whole blood viscosity issue viii: comparison of extrapolation method with diagnostic digital viscometer
topic Technical Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3336883/
https://www.ncbi.nlm.nih.gov/pubmed/22540108
http://dx.doi.org/10.4297/najms.2011.3333
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