1. Specimen must be drawn prior to replacement therapy.
2. Spin down, remove plasma, and spin plasma again.
3. Freeze specimens immediately at ≤ - 40 °C, if possible, placing 1.0 mL plasma in two separate vials (1.0 mL in each)
Activity: Fluorescence Resonance Energy Transfer (FRET )
Screen and Titer: Mixing Studies