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Test Code F11 Factor XI (F11) Assay

Collection Container

Light Blue

Specimen Required

Platelet poor plasma, whole blood if received in laboratory within 4 hours of collection

Specimen Volume

Platelet poor plasma -1 ml aliqout,Whole blood-2.7 mL

Minimum Specimen Volume

Platelet poor plasma-0.5 mL,Whole blood-2.7 mL.

Special Handling Instructions

Spin down,remove plasma and spin again.Double centrifued specimen is critical for accurate results as platelet contamination may cause spurious results.

Transport Temperature

Platelet poor plasma-frozen, whole blood-ambient temperature

Specimen Stability

Whole blood-4 hours

Reasons for Rejection

Hemolyzed,clotted, Whole blood >4 hours old

Methodology

Activated Partial Thromboplastin Clot-Based Assay

Reference Ranges

50-200%

Turnaround Time

1-3 days,depending on receipt in laboratory

Day(s) and Time(s) Performed

7 AM-3 PM,Monday-Friday

CPT Code

85270

Units of Measure

%

LOINC Code

3226-8