Normal range < 4.0 (age-dependent) ng/mL (< 4.0 µg/L SI). Specimen: Serum.
Also known as: prostate specific antigen.
< 4.0 (age-dependent) ng/mLReference range
Reference range
This result is reported qualitatively or as a one-sided threshold rather than a two-sided numeric band.
Combined adult band. LabVals does not publish separate men's, women's, or pediatric ranges for Prostate-Specific Antigen (PSA); those can be narrower than the band shown.
Prostate-Specific Antigen (PSA) reference range, specimen, and conversion details
Convert any Prostate-Specific Antigen (PSA) result between units on the unit converter.
What is the normal range for Prostate-Specific Antigen (PSA)?
The standard teaching reference range for Prostate-Specific Antigen (PSA) is < 4.0 (age-dependent) ng/mL in conventional units, or < 4.0 µg/L in SI units. This value is measured in serum.
Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.
Above the range
What causes a high Prostate-Specific Antigen (PSA)?
Screening and monitoring for prostate cancer, not diagnostic on its own.
Draw before, not after, a digital rectal exam or instrumentation.
The single < 4.0 ng/mL cutoff is the historical threshold and is no longer used on its own. Age-specific reference ranges (rising with each decade), PSA density, free-to-total PSA ratio and PSA velocity all refine interpretation, and current guidance treats screening as a shared decision rather than a single number. Read a PSA against the age-specific range your laboratory reports.
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