Below the range
Common causes of a low Prostate-Specific Antigen (PSA)
- 5-alpha reductase inhibitors (finasteride) lower PSA
Looking for the other direction? See what causes a high Prostate-Specific Antigen (PSA).
All tests · Tumor Markers · Prostate-Specific Antigen (PSA)
Below the range
What causes a low Prostate-Specific Antigen (PSA)?
Normal range < 4.0 (age-dependent) ng/mL (< 4.0 µg/L SI). Specimen: Serum. See the full Prostate-Specific Antigen (PSA) reference page for critical values and nursing considerations.
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.
| Specimen | Serum |
|---|---|
| Conventional range | < 4.0 (age-dependent) ng/mL |
| SI range | < 4.0 µg/L |
| Panel | Tumor Markers |
Full details, including nursing considerations, on the Prostate-Specific Antigen (PSA) normal range page. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.
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