Laboratory Services
Coagulation Factor IX Activity Assay, Plasma
Print this pageUpdated Test Information:
Test Description |
Coagulation Factor IX Activity Assay, Plasma
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Synonym(s) |
Factor 9, UOW1152 |
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Test ID |
F9
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General Information |
Clinical assay interference and limitations: Patients on bivalirudin (Angiomax), dabigatran (Pradaxa), rivaroxaban (Xarelto), apixaban (Eliquis), edoxaban (Savaysa) and argatroban (Novastan) may show prolonged clotting times. This may cause an under-estimation of the factor concentrations. Emicizumab (Hemlibra) will affect all PTT-based assays and will overestimate the factor concentration. Certain recombinant F9 formulation may give unreliable results with this assay. A chromogenic F9 assay is available at Bloodworks Northwest for these patients. Outside clients should fill and submit Coagulation Patient Clinical History Form. |
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Container Type |
3 or 5 mL Blue Top (Citrate) Tube |
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Specimen Type |
Blood |
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Specimen Requirements |
Entire Specimen |
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Specimen Collection / Processing Instructions |
The Laboratory MUST process specimen, within 4 hrs of blood collection. Centrifuge for 10 minutes, remove plasma & re-spin plasma for another 10 minutes. Decant & Freeze plasma (minimum 1.0 mL) @ -20°C to -80°C. Send frozen on dry ice. |
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Department (code) |
Coagulation (COAG) |
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Methodology |
Stago STA Clottable Factor assays |
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Estimated TAT |
Report by end of next business day |
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Testing Schedule |
Monday - Friday |
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CPT Code(s) |
85250 |
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Reference Range File | View/Download File | |
STAT Orderable (Y/N) |
Yes |
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Performing Lab |
UW |
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LOINC Code(s) |