C4AL – “C4a Level”

Update to specimen preparation, transport temperature, and stability

Specimen Preparation: Centrifuge within 30 minutes of collection and separate cell-free plasma. Send 1.0 mL plasma frozen (-20°C) in a screw capped plastic vial.

Transport Temperature: Frozen (-20°C)

Stability:

Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen (-20°C): 4 weeks