Patient prep: Patient should fast 12 hours prior to collection unless instructed differently by a physician.
Allow specimen to completely clot (this can take up to 60 minutes). Centrifuge for 15 minutes. The serum should be physically separated from contact with cells within two hours from the time of collection. If the specimen is collected in an anticoagulant tube without a gel barrier, centrifuge and transfer plasma into a properly labeled transfer tube within 2 hours of collection.