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Prostate-Specific Antigen (PSA) with Free PSA Fractionation (Serum)

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

This test measures total prostate-specific antigen (PSA) in your blood and breaks it down into free PSA and bound PSA fractions, which can help assess prostate health and guide further evaluation if needed.

Quick summary

["PSA testing helps monitor prostate health and detect potential issues like benign prostatic hyperplasia (BPH) or early prostate cancer."]

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

Key facts at a glance

LOINC
109755-9
Short code
PV3 Ab Msmt CSF
Synonyms
PV3 Ab Msmt CSF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order this test to evaluate symptoms of prostate enlargement, monitor progression of known prostate conditions, or screen for prostate cancer. Free PSA testing can also help distinguish between benign and malignant prostate concerns by providing a ratio of free PSA to total PSA.

What to Expect Before the Test

No special preparation is needed, but you may be asked to avoid ejaculation for 2–3 days before testing if you’ve had recent prostate exams. Drink plenty of water the day of your visit.

What the Test Results Mean

Total PSA levels alone don’t diagnose prostate cancer, but the free PSA fraction helps narrow down whether further testing (like a biopsy) may be needed. Results are interpreted by your healthcare provider based on your symptoms, age, and medical history.

Common Reasons for Abnormal Results

Elevated total PSA can occur with prostate inflammation, infection, or cancer. Free PSA alone is less useful for diagnosis but may indicate benign conditions. Always discuss results with your doctor.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: PSA Testing in Prostate Health

Short name

PSA Profile

Frequently asked questions

How long does it take to get PSA test results?
Results are typically available within 1–3 business days, depending on lab processing times. Your doctor will explain how to interpret them in the context of your overall health.
Can I eat or drink anything before this test?
No dietary restrictions apply, but avoid alcohol for 24 hours before testing if possible. Hydration is encouraged, but no special preparation is required beyond standard blood draw protocols.
Does this test replace a prostate exam?
No, PSA testing is a blood test that complements (but doesn’t replace) a digital rectal exam. Together, they help assess prostate health, but results should be discussed with your healthcare provider.
  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