Test directory: Factor XI Activity

Ordering Code 4325
Test Name Factor XI Activity
Preferred Specimen Plasma
Preferred Container Citrate, 3.2% (Lt Blue)
Other Specimen/Container None
Optimum Volume 3 mL
Collection Instructions Draw full tube.
Handling Instructions Double centrifuge plasma within 60 minutes of collection
Separate and freeze immediately
Strict frozen. Do not thaw.
Transport Requirements Oahu: Frozen
Airline: Frozen
Specimen Stability Frozen: 2 Weeks
Other: Frozen Only
Rejection Criteria Clotted, Hemolyzed, Ambient, Refrigerated, Thawed, Under filled tube, Over filled tube
Avail. Stat NO
Analytic Time Up to 5 Days
Methodology Photometric Clot Detection
Reference Lab  Quest Diagnostic Lab-NI

Reference range(s)

The reference ranges listed below are valid on this date of June 29, 2025.
Component Age Male Norm Male Critical Low Male Critical High Female Norm Female Critical High Female Critical Low Units Add'l info
Factor XI Activity ALL See report.