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Related Experiment Videos

Different free prostate-specific antigen to total prostate-specific antigen ratios using three detecting systems.

Hui-Qing Huang1,2, Yan Zhang1, Hua-Guo Xu1

  • 1Department of Laboratory Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.

Journal of Clinical Laboratory Analysis
|April 7, 2017
PubMed
Summary

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Investigating reversed prostate-specific antigen (PSA) ratios revealed assay-dependent variations. Heterophile antibodies may cause these discrepancies, necessitating further research for accurate prostate cancer diagnosis.

Area of Science:

  • Clinical Chemistry
  • Biomarker Analysis
  • Immunoassay Technology

Background:

  • Prostate-specific antigen (PSA) is a key biomarker for prostate health.
  • The ratio of free PSA (fPSA) to total PSA (tPSA) aids in differentiating benign prostatic hyperplasia (BPH) from prostate cancer (PCa).
  • Reversed fPSA/tPSA ratios present a diagnostic challenge.

Purpose of the Study:

  • To investigate the occurrence and potential mechanisms of reversed fPSA/tPSA ratios.
  • To analyze the impact of different immunoassay systems on these ratios.
  • To identify potential interfering factors in PSA testing.

Main Methods:

  • Eight reversed fPSA/tPSA ratios were generated using the UniCel DxI800 Access Immunoassay System.
  • Samples were subsequently re-assayed on Abbott Architect i2000 and Cobas e602 platforms.
Keywords:
immunoenzymatic assayprostate-specific antigenreversed ratio

Related Experiment Videos

  • Comparative analysis of ratio results across different immunoassay analyzers was performed.

    • Main Results:

    • Four of the eight reversed ratios maintained a ratio >1 when tested on the Abbott Architect i2000.
    • Seven of the eight reversed ratios yielded a ratio <1 when tested on the Cobas e602.
    • Significant assay-dependent variability was observed in the reversed fPSA/tPSA ratios.

    Conclusions:

    • Assay methodology significantly influences fPSA/tPSA ratio results, particularly reversed ratios.
    • Heterophile antibodies are a potential cause for the observed reversed ratios across different immunoassay systems.
    • Further investigation is required to definitively determine the cause of reversed fPSA/tPSA ratios and ensure diagnostic accuracy.