| Alternate Names | Factor I | 
| Ordering Recommendation | Used in the diagnosis of disseminated intravascular coagulation, and may be used to assess the effectiveness of thrombolytic therapy. Fibrinogen is an acute-phase inflammatory protein synthesized by the liver and is an essential component in the clotting cascade. | 
| Specimen | Sodium Citrate Plasma | 
| Container Type | Light Blue Top Tube 
 | 
| Methodology | Thrombin Clotting Time, Clauss Method | 
| Reference Range | 200-400 mg/dL | 
| Stability | 4 days | 
| Transport Temp | Room Temperature or Refrigerate 2°-8° C | 
| Instructions | None | 
| Days Performed | Daily | 
| Report Available | 1 day | 
| NY State Available | Yes | 
| LOINC | 3255-7 | 
| CPT Code | 85384 |