Orderable EAP code:

LAB101691

Billable EAP Codes:

80001097 x 1 80001106 x 1 (if reflexed)

CPT Codes:

85270 x 1 85335 x 1 (if reflexed)

Lab Section:

Hemostasis and Thrombosis

Includes:

If factor activity level is less than 40%, an inhibitor test will be performed.

Turnaround Time:

1 to 3 days

Test Schedule:

Monday, Wednesday, and Friday

Units:

Factors: %; Inhibitors: Bethesda Units (BU)

Critical Values:

Less than 5% for Activity 

Specimen Requirements:

Three full 2.7 mL LIGHT BLUE top tubes, 3.2% sodium citrate. Specimens must be processed and frozen within 2 hours of specimen collection. 

Send 3- 1 ml aliquots of platelet poor plasma, samples must remain frozen during storage and shipment. 

Stability is 14 days at -20°C or at –70°C for up to 12 months.

Detailed specimen collection and processing instructions are located under Lab Sections and then the Hemostasis and Thrombosis (Opens in a new window) section.

Pediatric Specimen Requirements:

Two full 2.7 mL LIGHT BLUE top tube, 3.2% sodium citrate. Specimens must be processed and frozen within 2 hours of specimen collection.

 

Send 2 800 uL aliquot of platelet poor plasma, samples must remain frozen during storage and shipment. 

Stability is 14 days at -20°C or at –70°C for up to 12 months.

For pediatric patients requiring multiple coagulation tests, please call 503-494-7383 regarding draw volumes.

Reference Range:

Inhibitor: Less than 0.6 BU.

Factor XI: 65% to 150%

For children less than 6 months, see link to published reference ranges (Opens in a new window).

Comments:

Avoid warfarin (Coumadin) therapy for two weeks and heparin therapy for 2 days prior to the test.

Synonyms:

Factor 11, Inhibitor

FXI