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Related Experiment Videos

A method to preserve sputum for delayed examination.

M M Kelly1, F E Hargreave, G Cox

  • 1Asthma Research Group, Firestone Institute for Respiratory Health, St Joseph's Healthcare-McMaster University, Hamilton, ON, Canada.

The European Respiratory Journal
|December 19, 2003
PubMed
Summary

A new sputum preservation method allows for delayed processing and examination, maintaining valid and repeatable cell counts. This technique enhances diagnostic flexibility for respiratory conditions.

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Area of Science:

  • Pulmonary Medicine
  • Laboratory Diagnostics
  • Cellular Pathology

Background:

  • Sputum cell count analysis is crucial for diagnosing respiratory diseases.
  • Current methods require immediate sample processing, limiting diagnostic accessibility.
  • A need exists for reliable sputum preservation techniques.

Purpose of the Study:

  • To evaluate the validity and repeatability of a novel sputum preservation method.
  • To compare cell counts from preserved sputum with routine processing.
  • To assess the convenience of the preservation method for delayed analysis.

Main Methods:

  • Sputum samples from 39 subjects were divided into two groups.
  • One group underwent routine dithiothreitol dispersal.

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  • The other group was preserved in a dithiothreitol-formaldehyde mixture before trypsin dispersal.

    • Main Results:

    • High intraclass correlation coefficients (ICCs) were observed for total cell counts (0.89) and differential counts (0.86-0.91) between methods.
    • The preservation method demonstrated excellent within-method repeatability (ICC 0.94-0.99).
    • Interobserver repeatability was high for both methods (ICC 0.96-0.99).

    Conclusions:

    • The dithiothreitol-formaldehyde preservation method is a valid and reliable technique.
    • This method allows for delayed sputum processing without compromising cell count accuracy.
    • The preservation technique offers a convenient solution for enhanced diagnostic flexibility.