Factor XI, Activity FAC11
| Method(s) | Clot Detection |
|---|---|
| Specimen Required | |
| Collect | One adequately filled 3.0 mL light blue (sodium citrate) top tube. |
| Transport | **TIME SENSITIVE** For specimens that cannot be shipped to the laboratory to arrive within 4 hours of collection, see Collection and Processing of Coagulation Specimens information (link below). |
| Remarks | Draw blood into citrate (light blue) top tube filled to the proper level (1 part anticoagulant to 9 parts blood). Invert tube 3-4 times to avoid clotting. |
| Stability | Ambient, Refrigerated: 4 hours; Frozen platelet-poor plasma: 2 weeks |
| Unacceptable Conditions | Specimens that are clotted, hemolyzed, collected in the wrong tube, less than 90% filled, exceed stability limits, or non-frozen plasma are unacceptable for testing. |
| Schedule | Thur |
| Billing Code | 4010116 |
| CPTCode | 85270 |
| Notes | Anticoagulant therapy may interfere with results. |
| Preferred Specimen Collection Device(s) | |
| Reference Interval | |
|
62-141 % |
|
