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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):Closeup of a vial with a light blue top.Top is light blue
Testing Schedule:Monday-Friday, 8 a.m.-3 p.m. 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 (601) 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 room temperature for up to 4 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.