Factor 9 Activity


Sunquest Code:F9  
Epic Code:LAB308Epic Name:Factor 9 Assay
Synonyms:Anti-Hemophilic Factor B; Christmas Factor; Factor IX Activity
Methodology:APPT clotting time correction of Factor 9 deficient plasma. Patient dilutions are compared to a known set of standard dilutions and a percentage is determined.
CPT Code:85250
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:2.7 mL (in 3 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

14-53%

1-4 d

34-72%

5-29 d

34-72%

30-89 d

36-66%

90-179 d

44-90%

180-364 d

61-111%

1 y and older

65-150%

 

 

Use:Factor 9 is an intrinsic coagulation pathway factor. Its congenital deficiency is commonly called Hemophilia B. This test is used to diagnose Hemophilia B and to monitor infusion therapy. Factor 9 requires Vitamin K for its carboxylation. It will be decreased in Vitamin K deficiency/coumadin therapy.


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