The 9:1 blood/citrate ratio must be kept constant. Adjustments for the amount of anticoagulant should be made when the hematocrit is abnormal (above 55%). Mix immediately to prevent clotting.
Collection Instructions
Send whole blood sample(s) at room temperature as soon as possible.
If specimens cannot be shipped immediately, centrifuge and separate plasma within 1 hour of collection, send frozen plasma on dry ice
Fridge: N/A
Centrifuge and separate plasma within 1 hour of collection.
Therapeutic Range: 0.3 – 0.7 IU/mL In case of discrepancies, always interpret results using reference ranges as stated on laboratory reports and/or electronic patient chart.