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Related Experiment Videos

Tricyclic antidepressant sample stability and the vacutainer effect

M Zetin, H R Rubin, R Rydzewski

    The American Journal of Psychiatry
    |September 1, 1981
    PubMed
    Summary

    Tricyclic plasma samples remained stable for 3 days at room temperature in sealed glass tubes. However, storage in Vacutainer tubes with stopper contact led to instability.

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    Area of Science:

    • Clinical Chemistry
    • Pharmacokinetics
    • Analytical Toxicology

    Background:

    • Tricyclic antidepressants are crucial in treating various mental health conditions.
    • Accurate plasma concentration measurements are vital for therapeutic drug monitoring.
    • Sample handling can significantly impact analyte stability and assay results.

    Purpose of the Study:

    • To evaluate the impact of different sample handling and storage methods on tricyclic plasma sample stability.
    • To determine optimal conditions for preserving tricyclic analytes in plasma specimens.
    • To provide evidence-based recommendations for clinical laboratory practices.

    Main Methods:

    • Analysis of 17 tricyclic plasma samples under varied storage conditions.
    • Comparison of sample stability in glass tubes sealed with Parafilm versus Vacutainer tubes.
    • Assessment of sample integrity over a 3-day period at room temperature.

    Main Results:

    • Tricyclic plasma samples demonstrated stability for up to 3 days at room temperature when stored in glass tubes sealed with Parafilm.
    • Samples stored in Vacutainer tubes with stopper contact exhibited instability.
    • Variations in sample handling significantly affected the integrity of tricyclic analytes.

    Conclusions:

    • Glass tubes sealed with Parafilm offer a reliable method for short-term storage of tricyclic plasma samples at room temperature.
    • Vacutainer tubes with stopper contact are unsuitable for maintaining the stability of these samples.
    • Standardized sample handling protocols are essential for accurate tricyclic drug level determination.

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