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Prostate Specific Antigen, Free
Alternative Names/Synonyms
Free PSA
Laboratory
Core Laboratory & Transfusion Medicine
Sub-section
Biochemistry
Specimen Type
Blood
Test Code
See Prostate Specific Antigen, Total for information
Clinical Significance (If applicable)
Distinguishing prostate cancer from benign prostatic conditions in patients with borderline or moderately increased
Prostate Specific Antigen, Total
.
Specimen Requirements (Sample Type)
Serum, Plasma
Specimen Requirements (Volume (mL))
0.5 mL
Specimen Requirements (Tube Type)
Serum (Gold SST)
Plasma (Light Green PST)
Collection Containers – Tube Types
Collection Requirements
Collection Instructions
Sample Stability
Room Temperature
: N/A
Fridge
: 5 days @ 2-8°C
Freezer
: 3 months @ -20°C
Cause for Rejection
Specimen Acceptability and Transport Guidance
Instrument, Methodology
Roche cobas e 602, immunoassay
Test Availability
24 hours a day, 7 days a week
STAT Turnaround Time
1 hour
Routine Turnaround Time
3 hours
Reference Ranges
Free PSA / Total PSA Ratio > 0.27, chance of prostatic cancer is about 10%.
Free PSA / Total PSA Ratio < 0.17, chance of prostate cancer is about 50%.
In case of discrepancies, always interpret results using reference ranges as stated on laboratory repor
Laboratory Contact Information
416-586-4800 extension 4688
Ordering Practices
Free PSA is reflexed only when Prostate Specific Antigen, Total falls within 4 - 10 ug/L.
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