Factor XII Activity
| Profile or Test Panel |
Intrinsic Factor Evaluation Profile
|
| Method | Clottable |
| Test Information | A one-stage intrinsic system clotting assay is used to measure circulating factor XII levels. Clotting times of dilutions of patient plasma are compared to dilutions of a plasma pool from normal donors, when added to deficient plasma. A deficiency of FXII is not associated with bleeding. |
| Additional Test Information | Normal Range: 60-170%, effective 11/1/11 |
| Sample Requirements | Whole Blood: 3.2% Sodium Citrated (blue top) OR Frozen Plasma |
| Requested Volume | Two 5 ml 3.2 sodium citrated (blue top) tubes as whole blood OR Frozen plasma in 4 X 1mL aliquots in plastic tubes |
| Minimum Volume or Pediatric volume | Frozen Plasma: at least 0.5ml in 2 plastic tubes. |
| Sample Information | Whole blood is preferred for testing but if it is not possible to send whole blood tubes TO ARRIVE HERE WITHIN 3 HOURS of collection then send frozen plasma. To prepare plasma centrifuge blue top tubes at 1500g for 15 minutes and remove the plasma and centrifuge a second time at 1500g for an additional 15 minutes. Aliquot approximately 1 ml of plasma into 4 plastic tubes, and freeze. |
| Shipping Information | Whole Blood: Send at ambient temperature (18-25C) and must be received within the lab in less than or equal to 3 hours after collection. Frozen Plasma: send on dry iceSend samples to: Bloodworks Northwest For additional information, please see Ordering Information |
| Requisition Form | RFT- Hemostasis Reference Laboratory |
| Transaction Code | 3210-17 |
| CPT Codes | 85280 |
| Test Schedule | Monday – Friday |
| Turn around Time (analytic time) | 1 Business Day |
| Report/ Results | Fax number required to receive report |