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Prostate-Specific Antigen (PSA) Total Volume-Corrected Calculation

Published: August 9, 2026Updated: August 16, 2026

This test measures the total amount of prostate-specific antigen (PSA) in your blood, adjusted for the volume of blood drawn. PSA is a protein produced by both healthy and cancerous prostate cells.

Quick summary

["PSA helps assess prostate health, often used in screening or monitoring for prostate cancer."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
15325-4
Short code
PSA/Prostate vol Calc
Synonyms
PSA/Prostate vol Calc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
0
Ref high
4
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
calculated
CPT
84153
SNOMED
39392002
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why PSA Testing Matters in Prostate Health

PSA is primarily used to monitor prostate health, including detecting early signs of prostate cancer or other prostate issues. However, PSA alone cannot diagnose cancer—it’s often one piece of a larger evaluation.

How This Test Works

Your blood sample is analyzed to measure PSA levels. The 'volume-corrected' calculation adjusts for variations in blood volume, providing a more consistent reference for interpretation.

When You Might Need This Test

Doctors may order PSA tests for routine screening (especially after age 50), monitoring symptoms like urinary issues, or evaluating prostate abnormalities found during other tests.

What the Results Mean

Results are compared to your clinical picture, not isolated ranges. Elevated PSA may signal prostate issues, but other factors (like age, race, or recent prostate exams) influence interpretation.

Reference range

Normal: <4.0 ng/mLN/A

Specimen: serum

No special preparation required. For PSA, avoid sexual activity for 24-48 hours before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: PSA and Prostate Health

Short name

PSA Total (Vol-Corrected)

Frequently asked questions

What could cause elevated PSA levels?
Elevated PSA can result from prostate cancer, benign prostatic hyperplasia (BPH), inflammation, infections, or recent prostate exams. It’s not definitive—additional tests or imaging may be needed.
How often should I get this test?
Frequency depends on your health history, symptoms, and doctor’s recommendations. Routine screening starts at age 50 (or earlier for high-risk groups), but your provider will guide timing.
Does diet or supplements affect PSA levels?
Certain foods (like tomatoes, lycopene-rich items) or supplements (e.g., saw palmetto) may influence PSA, but results are still interpreted clinically. Avoiding recent prostate exams or ejaculation before testing can help stabilize results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy