Prostate specific antigen (FPSA), free

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Test Name:

Prostate specific antigen (FPSA), free

Synonyms:

Free PSA

Ordering Information:

Test Panel includes:
• Total PSA
• Free PSA
• Prostate specific antigen % free

Patient Instructions:

Waiting two weeks after DRE to collect blood for PSA is recommended

Collection Device/Tube Type:

1. EDM Base Lab: 5 mL blood - GOLD SST (gel)
2. CGY DSC: 4.5 mL blood - MINT LIHEP PST (gel)
3. NOTE: The preferred tube type at each testing site is acceptable at the alternate site

Submission Requirements:

1 mL serum or lithium heparin plasma

Handling/Storage Comments:

• Refrigerated transport preferred, but not required except South Zone, refrigerated transport is required

• If transport delay of > 48 hours is expected between specimen collection and receipt at EDM Base Lab or CGY DSC, then:
• Spin and aliquot the serum or lithium heparin plasma
• freeze sample
• transport frozen

Frequency of Testing:

Daily

Reference Range:

Prostate specific antigen (PSA), total	See Prostate specific antigen (PSA), total
Prostate specific antigen (FPSA), free	< 1.01 ug/L
Prostate specific antigen % free	< 11 %	Increased likelihood of prostatic carcinoma
	11 – 25 %	Overlap of malignant and benign diagnosis
	> 25 %	Increased likelihood of benign diagnosis

NOTE: No free PSA percentage can conclusively rule out or rule in prostatic carcinoma

Last Reviewed:

04 May 2023

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