Specimen: 3 mL whole blood in 1 Blue Top (Sodium Citrate) tube. Mix thoroughly by inversion. Transport to Lab within 4 hours. If this is not possible, make PPP within 1 hour of collection as follows: Centrifuge sample at 3600 rpm for 15 min. & transfer supernatant to a clean plastic tube. Centrifuge this supernatant again at 3600 rpm for 15 min. & finally transfer the supernatant (PPP) to 1 labelled clean plastic screw capped vial. FREEZE IMMEDIATELY. Ship frozen. DO NOT THAW. Overnight fasting is preferred. Duly filled Coagulation Requisition Form (Form 15) is mandatory.
Stability (Room): 4 hrs
Stability (Refrigerated): 4 hrs
Stability (Frozen): 2 weeks
Method: Photo-optical Clot Detection
Price: Contact Medilab
Turnaround time (TAT): 4 hrs
Usage: Prothrombin time measures the time it takes for plasma to clot when exposed to tissue factor. Since PT comprises reactions of coagulation that occurs in tissue injury & common pathways of coagulation, deficiencies in the activity of Factors II, V, VII, X or fibrinogen may prolong the PT. INR standardizes the reporting of PT values in Warfarin anticoagulated patients.
Disease: Disorders of Coagulation
Components: *Prothrombin Time (PT) *Prothrombin Ratio (PR) *International Normalised Ratio (INR)
Home Collection: Available
Pre-test Information: Overnight fasting is preferred. Duly filled Coagulation Requisition Form (Form 15) is mandatory.