Tests
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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): |  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. |