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Effect of ejaculation on serum total and free prostate-specific antigen concentrations
J D Herschman1, D S Smith, W J Catalona
1Department of Surgery, Washington University School of Medicine, St. Louis, Missouri, USA.
Urology
|August 1, 1997
Summary
Ejaculation temporarily elevates prostate-specific antigen (PSA) levels. PSA testing within 24 hours of ejaculation may lead to inaccurate prostate cancer screening results.
Area of Science:
- Urology
- Oncology
- Biochemistry
Background:
- Total serum prostate-specific antigen (PSA) is a key biomarker for prostate cancer detection.
- Free to total PSA ratio enhances specificity, but transient PSA elevations can affect accuracy.
- Ejaculation is a potential factor influencing PSA levels.
Purpose of the Study:
- To prospectively investigate the impact of ejaculation on total and free PSA levels.
- To determine if ejaculation-induced PSA changes affect prostate biopsy recommendations.
Main Methods:
- 20 male volunteers (mean age 59) with baseline PSA < 4.0 ng/mL were studied.
- Total and free serum PSA were measured at baseline, and 1, 6, and 24 hours post-ejaculation.
- Repeated-measures ANOVA analyzed PSA changes; biologic variability was considered.
Main Results:
- Total PSA significantly increased 1, 6, and 24 hours post-ejaculation.
- Free PSA returned to baseline by 6 hours, while percent free PSA decreased below baseline by 24 hours.
- At 24 hours, 40% of men had elevated total PSA, and 10% had elevated percent free PSA due to ejaculation.
Conclusions:
- Ejaculation causes immediate increases in total and free PSA with distinct recovery patterns.
- PSA testing within 24 hours of ejaculation can lead to misinterpretation of results for a subset of men.