Factor 11 Activity


Sunquest Code:F11  
Epic Code:LAB309Epic Name:Factor 11 Assay
Synonyms:Anti-Hemophilic Factor C; Plasma Thromboplastin Antecedent; Factor XI Activity
Methodology:APTT clotting time correction of factor 11 deficient plasma. Patient dilutions are compared to a known set of standard dilutions and a percentage is determined.
CPT Code:----------CPTCODES HERE----------
Turnaround Time:Turnaround time is 4-8 hours if received during lab hours (see Associated Link). With pre-notification, stats are done within 1 hr after receipt in the laboratory.
Associated Links:

Specimen Collection and Processing for Coagulation Specimens



Collection Instructions

Specimen:Blood
Optimal Volume:2.7 mL (in 3 mL tube) - filled to fill line on the tube.
Minimum\Peds Volume:1.8 mL (in 2 mL tube) - filled to fill line on the tube.
Collection Instructions:See link to Specimen Collection and Processing for Coagulation Specimens.
Causes for Rejection:Underfilled tube or clotted specimens.


Processing and Shipping

Specimen Processing:See link to Specimen Collection and Processing for Coagulation Specimens.
Shipping Instructions:See link to Specimen Collection and Processing for Coagulation Specimens.
Test Performed at or Referral Lab Special Coagulation  (UMMC-East Bank)


Interpretive

Critical Range:Less than 10%
Reference Range:

Less than 1 d

21-72%

1-4 d

24-52%

5-29 d

39-71%

30-89 d

40-66%

90-179 d

55-83%

180-364 d

62-110%

1 y and older

65-150%

 

 

Use:Factor 11 is an intrinsic coagulation pathway factor. A deficiency may cause bleeding of variable severity (usually mucous membrane or post surgical).


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