Container/Tube: Serum gel tube
Specimen Volume: 5 mL of serum
Transport Temperature: Refrigerated
Collection Instructions: Allow blood to clot for 30 minutes. Spin tube in centrifuge for 10 minutes. If there is a delay in transport of ≥2 hours, send specimen refrigerated.
Stability
| Storage | Temperature | Stability |
| Room Temperature | 20-25 °C (64-82 °F) | Not recommended |
| Refrigerated | 2-8 °C (36-46 °F) | ≤ 7 days |
| Frozen (serum only) | -20 °C (-4 °F) | ≤ 4 weeks |
Chemiluminescence Immunoassay
0-3.0 ng/dL
Slightly elevated normal ranges if patient is a smoker.
Monday through Sunday
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