Serum PSA Test Explained: Normal Levels, Causes, and Prostate Cancer Screening Guide

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 Serum PSA (Prostate-Specific Antigen) is a blood test used to measure the level of PSA, a protein produced by the prostate gland. It is widely used as a screening and monitoring tool for prostate health, especially in men over 50 years.

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Why is PSA Important?

PSA testing helps in:

  • Early detection of prostate cancer
  • Monitoring treatment response in prostate disease
  • Detecting recurrence after treatment

Normal PSA Levels

  • Generally below 4 ng/mL is considered normal
  • Levels between 4–10 ng/mL may indicate possible prostate issues
  • Levels above 10 ng/mL increase suspicion of prostate cancer

(Normal ranges may vary with age and lab standards.)

Causes of Elevated PSA

High PSA levels do not always mean cancer. They can also be due to:

  • Benign Prostatic Hyperplasia (BPH)
  • Prostatitis (inflammation of the prostate)
  • Urinary tract infection
  • Recent ejaculation or prostate manipulation

Clinical Significance

PSA is a valuable but non-specific marker. Doctors often combine it with:

  • Digital Rectal Examination (DRE)
  • Imaging tests
  • Biopsy (if needed)

Limitations

  • PSA can be elevated in non-cancerous conditions
  • May lead to overdiagnosis or unnecessary testing
  • Should always be interpreted in clinical context

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Conclusion

Serum PSA is an important and widely used test for evaluating prostate health. While it plays a key role in early detection, results must be carefully interpreted along with other clinical findings.

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