Last Modified:
9/22/2021 2:45:20 PM
Medical Necessity Documentation:
Client Notes:
Patient Preparation:
Specimen Requirements:
1.0 mL platelet poor plasma from a Blue Top Tube - 3.2% Na Citrate in a Plastic Vial
Collection Instructions:
Centrifuge light blue-top tube for 15 minutes at approximately 1500 x g within 60 minutes of collection. Using a plastic pipette, remove plasma, taking care to avoid WBCs/platelet buffy layer and place into a plastic vial. Centrifuge a second time and transfer platelet-poor plasma into a new plastic vial. Plasma must be free of platelets (< 10,000/uL). Freeze immediately and ship on dry ice.
Minimum Volume:
0.5 mL Platelet Poor Plasma
Transport & Storage: Temperature/Stability:
Unacceptable Ambient
Unacceptable Refigerated
14 days Frozen
Rejection Criteria:
Received room temperature • Received refrigerated • Received thawed • Hemolysis
Reference Range:
60 -160% of normal
Critical Ranges:
Test Comments:
Methodology:
Photometric Clot Detection
Clinical Significance:
This test is useful to evaluate a prolonged aPTT. The second most common form of hemophilia is caused by deficiency of factor IX. Hemophilia B is an x-linked disorder affecting between 1 in 25,000 to 30,000 males.
Documentation:
Limitations: Expected impact by therapeutic levels (potential interference depends upon drug concentration): Warfarin: Decrease; Heparin (UFH or LMWH): no effect to inhibitor pattern; Dabigatran or Argatroban (Thrombin Inhibitors): no effect to inhibitor pattern; Rivaroxaban or Apixaban (Factor Xa Inhibitors): no effect to inhibitor pattern.
Custom Panel:
No
PRODUCTION SCHEDULE
Turn Around Time:
5 to 7 days
Days Performed:
Tuesday, Thursday, Saturday
Sites Performed:
Quest - Chantilly
PHL Test Code:
FACT9
EPIC Test Code:
LAB308
Send Out Test Code:
352X
Alternate Test Names:
Christmas Factor; Factor IX Activity; Factor IX Assay; Hemophilia B
Included Tests:
CPT Coding:
85250
Go back to the top of the page.