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16049: Factor Viii Activity, Chromogenic Print View
FVIII Act, Chromo     % normal 

PRIMARY
1 Plasma Citrated 1 (0.5) mL   Room Temperature - 8 Hour(s)/Refrigerated - 8 Hour(s)/Frozen - 21 Day(s)  
ALTERNATE

Preferred test in patients with Lupus anticoagulant, on heparin or direct thrombin inhibitors, or on Factor VIII concentrates.

Platelet-poor plasma: Centrifuge light blue-top tube 15
minutes at approx. 1500 x g within 60 minutes of collection.
Using a plastic pipette, remove plasma, taking care to avoid
the WBC/platelet buffy layer and place into a plastic vial.
Centrifuge a second time and transfer platelet-poor plasma
into a new plastic vial. Plasma must be free of platelets
(<10,000/mcL). Freeze immediately and ship on dry ice.

Note:
Storage of whole blood at refrigerated temperatures prior to
processing may lead to cryoprecipitate formation and falsely
low Factor VIII.
Setup Schedule
Wednesday, Saturday

Reported (Analytical Time)
Same day

CPT Code
85240

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

Notes
Reject Criteria: Received Room temperature; Received Refrigerated
Transport Temperature: Frozen
Methodology: Chromogenic Assay






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