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Factor 12 Activity
|Test group||Coagulation Factor Activities|
|Performed by||UC Davis|
|Method||Photometric clot detection|
|Collection Instructions||1. Check the expiration date on the label of the blue top vacutainer before drawing the patient.
2. For blood collection in a sodium citrate blue top, the tube must be filled to above the Minimum Fill Indicator on the tube. It is crucial to wait and allow the tube to stop filling before removing it from the needle.
3. With use of a butterfly needle, draw about 1 cc using a separate blue top to remove air from tubing, discard the first tube and then draw a second blue top tube filled to the full extent of the vacuum.
4. Tubes should not be filled past the Maximum Fill dashed line by either using a syringe or removing the tube cap.
Deliver immediately to the laboratory.
For patients with Hct's ≥ 55% please contact Hematology (x3-1747) to obtain blue top tubes with adjusted citrate volumes in order to maintain the proper citrate to plasma ratio for coagulation studies.
|Container type||Blue top filled to full extent of vacuum|
|Amount to Collect||2.7 mL blood|
|Sample type||Citrated plasma|
|Preferred volume||1.5 mL plasma|
|Min. Volume||0.5 mL plasma|
|UCSF Rejection Criteria||Samples collected in outdated blue top vacutainer. Over-filled or under-filled tubes may be rejected|
|Processing notes||Provide sample(s) to Hematology section asap. Centrifuge and freeze platelet poor plasma at -20C.
For B&T patients order Labcorp test #086322
|Normal range|| Age
|Synonyms||F12; FXII; Factor XII; Contact factor; Contact activation factor|
|Stability||Factor assays should generally be performed within four hours of specimen collection or the plasma frozen; the latter is stable for 2 weeks at -20C or 6 months at -70C.|
|Turn around times||Performed 5x per week. Turnaround 3-5 days.|
|Additional information||Factor 12 Deficiency is not associated with a bleeding diathesis.|
|Last Updated||9/21/2011 2:35:43 PM|