Prostatic specific antigen, total & free
Prostatic specific antigen, total & free-4765
Prostatic specific antigen
It is recommended to obtain specimens for PSA testing prior to procedures involving manipulation of the prostate.
Immediatley following collection, mix sample by inverting 5 times
- Allow sample to clot for a minimum of 30 minutes
- Spin within two (2) hours of sample collection
Gold serum separator (SST) tube
Red/Grey marble top serum separator (SST) vial/tube, 8.5 mL
Red/Grey marble top:
Immediatley following collection, mix sample by inverting 5 times
- Allow sample to clot for a minimum of 30 minutes
- Spin within two (2) hours of sample collection
Red:
- Allow sample to clot
- Spin
- Transfer serum to a False bottom plasma/serum transport vial/tube (AHL), labelled as serum, within two (2) hours of sample collection
Refrigerated (preferred) - 5 days
Frozen - 6 months
- Improper labels (unlabeled or mislabeled)
- Hemolysis (some procedures)
- Improper anticoagulant or ratio
- Delay in transport
- Improper storage temperature affecting results
- Improper container
- Leaking container resulting in compromised specimen
- Quantity not sufficient (QNS)
Chemiluminescent Microparticle Immunoassay (CMIA)
Total PSA: < 4.0 ng/mL
When the total PSA is <4.0 or >10.0, the % Free PSA will not be calculated. The % Free PSA will be reported as "Not Specified"
In patients with total PSA concentrations between 4.0 and 10.0 ng/mL, the Prostate Health Index (PHI) may aid in distinguishing prostate cancer from benign prostate conditions.