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Sensitivity, Specificity, and Predicted Value01:13

Sensitivity, Specificity, and Predicted Value

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In healthcare diagnostics, laboratory tests play a crucial role in identifying and diagnosing a wide range of medical conditions. However, interpreting test results is not always straightforward. An abnormal test result does not always confirm the presence of a disease, just as a normal result does not guarantee its absence. To assess the reliability of these diagnostic tools, healthcare practitioners rely on two key statistical indicators: sensitivity and specificity.
Sensitivity is the...
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True-positive reflex threshold value for HCV antibody screening test.

Ainulkhir Hussin1, Rusmah Yusof1, Mohd Yusof Nor Rahim1

  • 1Department of Pathology, Queen Elizabeth Hospital, Ministry of Health, Kota Kinabalu, Sabah, Malaysia.

Journal of Infection in Developing Countries
|April 11, 2022
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Summary

Determining the optimal signal-to-cut-off ratio for the ABBOTT ARCHITECT i2000SR immunoassay is crucial for accurate anti-HCV screening. An optimal ratio of 5.05 was identified, demonstrating high sensitivity and specificity for reliable results.

Keywords:
HCVS/Coimmunoassaythresholdtrue-positive

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Area of Science:

  • Clinical Diagnostics
  • Immunology
  • Hepatology

Background:

  • The Centre for Disease Control and Prevention recommends signal-to-cut-off (S/Co) ratios for supplemental testing in anti-HCV screening.
  • Accurate interpretation of immunoassay results is vital for effective Hepatitis C Virus (HCV) detection.

Purpose of the Study:

  • To determine the optimal true-positive signal-to-cut-off ratio for the ABBOTT ARCHITECT i2000SR immunoassay.
  • To validate this ratio using reference and line immunoassay (LIA) tests for anti-HCV screening.

Main Methods:

  • Analysis of 13,240 specimens using the ARCHITECT i2000SR immunoassay.
  • Application of Serodia® HCV particle agglutination (HCV-PA) assay as a reference test for reactive specimens (S/Co ratio ≥ 1.00).
  • Receiver operating characteristic (ROC) curve analysis to determine optimal S/Co ratio and performance characteristics, followed by validation with a HCV-LIA test.

Main Results:

  • ROC analysis identified an optimal S/Co ratio of 5.05, yielding the highest Youden's Index (0.89).
  • This ratio achieved a sensitivity of 93.1% and specificity of 96.0%.
  • Validation using LIA confirmed high accuracy (91.8%), sensitivity (92.0%), and specificity (91.7%).

Conclusions:

  • The established optimal S/Co ratio of 5.05 for the ARCHITECT i2000SR immunoassay demonstrates high diagnostic performance.
  • This validated ratio can be reliably employed in routine anti-HCV screening protocols.
  • The findings support the use of this specific S/Co ratio for improved accuracy in HCV diagnostics.