Factor IX Activity, Clotting:
Fasting Required: No
Specimen: Blood
Lab: Quest Diagnostics
Results: Average processing time 3-5 days
Note: Result turnaround times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.
Alternate Name: Christmas Factor, Antihemophilic Factor B, Factor IX Functional
Description: This test is used to find the cause of too much bleeding (decreased blood clotting). Or, it may be ordered if a family member is known to have hemophilia B. The test may also be done to see how well treatment for hemophilia B is working