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Test Code F8 Factor VIII, Plasma

Performing Laboratory

Mary Washington Healthcare-Department of Pathology and Laboratory Medicine-Hematology

Specimen Requirements

Specimen should arrive within 2 hours of collection.



Container/Tube:   2 Light blue-top (sodium citrate) tube(s)

Volume:  Fill both tubes to "fill" line. Tubes must be completely full for proper blood to anticoagulant ratio.

Collection Instructions:

1. Tube for discard (without additives) should be drawn if using a winged blood collection set to remove dead space prior to filling citrate tube.

2. Gently invert 3 to 4 times to mix blood. Do not shake.

Transport Temperature: Ambient. If there is a delay in transport of >4 hours see "Note" below.

Note: If there is a delay in transport:


          Remove plasma to plastic tube.

          Centrifuge plasma again.

          Remove plasma (platelet-poor) a second time to fresh plastic tube.

          Freeze specimen for transport.


Label specimen appropriately (plasma).


Reference Values


Day(s) Test Set Up

Routine specimens Monday through Friday (day shift only)

Notify laboratory for STATs

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