[Skip to Content]

Factor IX Activity (F9)

Send to a FriendPrint Page

EPIC Test Name

FACTOR 9 ASSAY

EPIC Code

LAB308

Specimen Requirements

Plasma
Minimum Volume:2.7 mL
Collection:Collect using standard laboratory procedures. Tubes must be full to obtain proper blood to anticoagulant ratio or the specimen will be rejected.
Transport:Specimens scheduled to arrive in lab in less than 4 hours can be sent at room temperature. Specimens arriving more than 4 hours must be platelet poor specimens and need to be frozen before transport. Place in an insulated container filled with dry ice to ensure that the specimen does not thaw.
Stability:Room temp: 4 hours Frozen: 2 weeks at -20 C 6 months at -70 C.
Container:Light-blue top (3.2% sodium citrate)
Processing/Storage:Specimens that cannot reach the lab within the time frame should be double spun at 2500 g for 15 minutes to obtain platelet poor plasma. 0.5mL aliquots should be frozen in plastic at -20 degrees C.
Rejection Causes:Clotted
Insufficent Sample Volume

Methods

Automated clotting assay

Turnaround Time

SpecimenTurnaround Time
PlasmaTesting is batched

Reference Ranges

Automated clotting assay
AgeAll RangeUnit
0-5 days15-91 U/dLU/dL
5 days - 1 month21-81 U/dL
1 - 3 months21-113 U/dL
3 - 6 months36-136 U/dL
>6 months50-150 U/dL

Clinical Indications

Diagnosis of Factor IX deficiency (Hemophilia B). Useful in the workup of unexplained prolongation of the PTT. Decreased Factor IX may also be seen in liver disease, Vitamin K deficiency, and warfarin treatment. Inhibitory antibodies are not common.

Common Synonyms

Factor IX

Performed

Lab
Special Testing

CPT

85250

LOINC

3188-0

Contact Information

Special Testing: (315)464-4460
Top