If testing will be performed > 5 days past collection, centrifuge and separate serum from cells and transfer to plastic vials; do not freeze whole blood. |Plasma samples > 5 days past collection are not suitable for testing.
Frozen at -20°C - Indefinite (Serum)
Refrigerated 2-8°C - 5 days
Ambient or Refrigerated 2-8°C – Up to 5 Days (Serum)