Specimen Requirements

Container/Tube:

Preferred:  Green-top (lithium heparin) tube

Acceptable: Gold-top serum gel tube or plain, red-top tube, EDTA lavendar

Minimum Specimen Volume: 6µL plus a dead volume

Stability:  7 days when separated from cells at 2 – 8 °C, 5 days at 20‑25 °C, and 

30 days at ‑20 °C (± 5 °C). Freeze only once.

Note:  This assay is affected by biotin interference.