Prostate-specific antigen

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Prostate specific antigen, abbreviated PSA, is marker that is quite specific for the prostate.

General

  • Quantity in the serum used to screen for prostate cancer.
  • PSA immunostain useful for classifying a carcinoma as prostate carcinoma.

Serum PSA

  • Normal - typically < 4.0 ng/mL.
  • Increases with age.[1]

Prostate specific antigen density

  • Abbreviated PSAD.

Better predictor than (unadjusted) serum PSA for:

A forumla for PSAD

  • Benson et al.:[3]
 
    • Where
 
D1, D2, D3 are the major axes.

Note:

  • The volume of an ellipsoid is:
 

See also

References

  1. Ku JH, Ahn JO, Lee CH, et al. (September 2002). "Distribution of serum prostate-specific antigen in healthy Korean men: influence of ethnicity". Urology 60 (3): 475–9. PMID 12350489.
  2. Sfoungaristos S, Katafigiotis I, Perimenis P (2013). "The role of PSA density to predict a pathological tumour upgrade between needle biopsy and radical prostatectomy for low risk clinical prostate cancer in the modified Gleason system era". Can Urol Assoc J 7 (11-12): E722–7. doi:10.5489/cuaj.374. PMC 3840515. PMID 24282465. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3840515/.
  3. 3.0 3.1 Benson MC, Whang IS, Pantuck A, et al. (March 1992). "Prostate specific antigen density: a means of distinguishing benign prostatic hypertrophy and prostate cancer". J. Urol. 147 (3 Pt 2): 815–6. PMID 1371554.