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Related Experiment Videos

Evaluation of age-specific normal ranges for prostate-specific antigen

V O Speights1, P N Brawn, D M Foster

  • 1Department of Pathology, Scott & White Clinic and Memorial Hospital.

Urology
|March 1, 1995
PubMed
Summary

Using age-specific normal ranges (ASNRs) for prostate-specific antigen (PSA) testing can improve accuracy. ASNRs help reduce false positives in men aged 60-79, enhancing diagnostic specificity.

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Area of Science:

  • Urology
  • Oncology
  • Biochemistry

Background:

  • Serum prostate-specific antigen (PSA) is a key biomarker for prostate health.
  • The traditional normal range (TNR) for PSA is 0.0 to 4.0 ng/mL.
  • Age-specific normal ranges (ASNRs) may offer improved diagnostic precision.

Purpose of the Study:

  • To compare the diagnostic utility of the TNR versus ASNRs for serum PSA.
  • To evaluate the impact of ASNRs on PSA interpretation in different prostate cancer volumes.
  • To identify age groups where ASNRs show the most significant differences from TNR.

Main Methods:

  • Analysis of autopsy data from 171 Caucasian men over 40 years old.
  • Prostate tissue was sectioned and categorized by cancer presence and volume (<1 cc vs. ≥1 cc).

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  • PSA values were compared using both TNR and ASNRs across patient groups.

    • Main Results:

    • The TNR identified 21.9% of cancer-free patients with elevated PSA, compared to 17.1% with ASNRs.
    • For men with cancer ≥1 cc, TNR showed 100% elevated PSA, while ASNRs showed 91.7%.
    • Discrepancies between TNR and ASNRs were primarily observed in men aged 60-79.

    Conclusions:

    • ASNRs demonstrate potential for increasing PSA test specificity.
    • Implementing ASNRs may help reduce unnecessary follow-up for elevated PSA in older men.
    • Age-adjusted PSA ranges can refine the interpretation of screening tests.