Factor X Activity, Chromogenic
Also known as: Stuart-Power Factor, Factor X Ag, Activity
Use
Assesses Factor X chromogenic activity in plasma; useful for monitoring oral anticoagulant therapy (e.g., warfarin) in patients with prolonged pro‑times due to lupus inhibitors or direct thrombin inhibitors, and for evaluating Factor X deficiency.
Special Instructions
Not provided.
Limitations
Not provided.
Methodology
Other
Biomarkers
Result Turnaround Time
1-3 days
Related Documents
For more information, please review the documents below
Specimen
Plasma
Volume
1 mL
Minimum Volume
0.5 mL
Container
3.2% sodium citrate (light blue-top) tube
Collection Instructions
Collect platelet‑poor plasma by centrifuging light blue top 15 minutes at ~1500×g within 60 minutes of collection. Remove plasma, avoiding buffy layer; centrifuge second time; transfer platelet‑poor plasma to plastic vial. Plasma must be free of platelets (<10,000/µL). Freeze immediately and ship on dry ice.
Causes for Rejection
Gross hemolysis; icterus; lipemic; received at room temperature or refrigerated
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 2 hours |
| Refrigerated | 8 hours |
| Frozen | 21 days |