Specimen Requirements

1. Draw blood in a blue-top (citrate) tube(s) from a fasting patient. Spin down, remove plasma, spin plasma again, and place 1 mL of citrate platelet-poor plasma in plastic vial. (Glass vial is not acceptable.)

Note:  Double-centrifuged specimen is critical for accurate results as platelet contamination may cause spurious results.
2. Freeze specimen immediately at ≤-40° C, if possible.
3. Send specimen frozen.