Red serum vial/tube, 5 mL

1. Allow sample to clot for a minimum of 30 minutes
2. Spin within two (2) hours of sample collection
3. Transfer serum to a Transfer vial/tube with cap - 12mL (LabCorp), labelled as serum

Transfer vial/tube with cap - 12mL (LabCorp)

Lavender (EDTA), 4mL

Immediately following collection, mix by inverting 8 - 10 times to prevent clotting

1. Spin within two (2) hours of sample collection
2. Transfer plasma to a Transfer vial/tube with cap - 12mL (LabCorp), labelled as EDTA plasma

Refrigerated (preferred) – 30 days

Ambient - 30 days

Frozen – 24 months

• Specimens collected or recieved in gel separation tubes (SST or PST)

High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS)

Therapeutic range: Approximately 1 - 2 µg/mL