Test List

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  • Factor XI Assay

    Test Name:Factor XI Assay
    Epic Order Code:LAB309
    CPT Code:85260  
    Specimen(s) Type:Plasma; Full tube required
    Acceptable Container(s):
    Testing Schedule:Monday - Friday, 8 am - 3 pm. If possible, the factor XI assay should be scheduled in advance with the lab. Optimal results are obtained with fresh plasma, and freezing effects the results.
    Turn Around Time:STAT: Notify lab at 984-2367
     Routine: 3 - 5 days
    Collection Information:No special patient preparation required. Obtain specimen by standard collection procedures. If only Factor XI is being collected, draw 5 mL into a red top tube, discard and then collect Factor XI tube. A full tube is required.
    Transport Information:Deliver to lab immediately. All specimens must be signed into the laboratory.
    Reference Clients:If unable to deliver to the lab within 1 hour, centrifuge the specimen for 10 minutes at 3500 RPM to ensure platelet poor plasma. Remove plasma from cells, taking care to avoid the WBC/platelet buffy layer and place into a transport tube. Store and transport at 2-8° C for up to 3 hours. If testing is delayed beyond this, the sample must be stored and transported frozen at -20° C and delivered to lab within 2 weeks.
    Causes for Rejection:Improperly labeled, incorrect container, contaminated, insufficient quantity, incorrect/delay in transport, grossly hemolyzed, clotted, under or over-filled tube.
    Reference Range:50 - 150%
    Additional Information:If more than 2 Factor Assays are ordered, collect 2 light blue top tubes.