PSA, Free and Total is drawn in a SERUM, sst at Quest, a Red-top tube, gel-barrier tube, or green-top (lithium heparin) tube. Do not use oxalate, EDTA, or citrate plasma. at LabCorp, and a SST Tube at BioReference.
Lab comparison
PSA, Free and Total: Quest vs LabCorp vs BioReference, tube, code & requirements
. This page shows collection requirements for all three major reference labs in one view, so you don’t have to cross-check three portals.
Always verify against your lab’s current collection manual before drawing.
Every value on this page is verified by a nurse practitioner in active clinical practice, not scraped from an automated source.
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| Requirement | Quest Diagnostics | LabCorp | BioReference |
|---|---|---|---|
| Test code | 31348 | 010322 | 0190-9 |
| Primary tube | SERUM, sst | Red-top tube, gel-barrier tube, or green-top (lithium heparin) tube. Do not use oxalate, EDTA, or citrate plasma. | SST Tube |
| Specimen type | Serum (preferred) or plasma | 1 mL SST Tube | |
| Patient prep | None Specified | None Specified | None Specified |
| Minimum volume | Not stated | Not stated | Stated with specimen 1 mL |
Frequently asked questions
What is the Quest Diagnostics order code for PSA, Free and Total?
The Quest Diagnostics order code for PSA, Free and Total is 31348.
What tube color does LabCorp use for PSA, Free and Total?
LabCorp uses a Red-top tube, gel-barrier tube, or green-top (lithium heparin) tube. Do not use oxalate, EDTA, or citrate plasma. for PSA, Free and Total.
Does PSA, Free and Total require fasting?
PSA, Free and Total patient prep: None Specified. Always confirm with the ordering lab before the draw.
Data provenance
Source: Quest Diagnostics specimen collection manual, LabCorp directory of services, and BioReference laboratory collection guide.
Verified by: a licensed nurse practitioner in active clinical practice. Values are reviewed against each lab’s published collection requirements. Always confirm against your lab’s current manual before drawing.
Quest verified by: Mandi Boss B Franklin, Aug 29, 2026
LabCorp verified by: Mandi Boss B Franklin, Aug 29, 2026
BioReference verified by: Mandi Boss B Franklin, Aug 29, 2026
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