Factor 11 Activity


Abbrev Code:F11   
Order Code:LAB309Order 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 Codes: 85270 x1, 85270 x1
Turnaround Time:Within 8 hours if received into the testing laboratory by 12 p.m. Testing performed 6 days per week. With pre-notification, STATs are done within 1 hour after receipt in the testing 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.
Container:Blue Na Citrate, 3.2% - fill to fill line on tube
Collection Instructions:See link to Specimen Collection and Processing for Coagulation Specimens.
Causes for Rejection:Underfilled tubes, overfilled tubes, clotted specimens, not received or processed and frozen within 4 hours of collection or, specimen thawed during transit.


Processing and Shipping

Specimen Processing:
  • Process for Platelet Poor Plasma within 4 hours of collection.
  • Aliquot plasma, place clear tape around label, and freeze at -20C or on dry ice within 4 hours of collection.
  • If multiple tests are collected on 1 blue top, split each blue top into 2 aliquots. Minimum 0.5 mL per tube.
  • A maximum of 6 aliquots are needed per collection.
     
See link to Specimen Collection and Processing for Coagulation Specimens.
Shipping Instructions:
  • Ensure specimen is frozen before shipping.
  • Ship on dry ice, sample must remain frozen during shipping.
     
See link to Specimen Collection and Processing for Coagulation Specimens.
Test Performed at or Referral Lab UM Special Coag (K)  (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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