The prothrombin time (PT) assays the extrinsic and common pathways of the coagulation cascade. The international normalised ratio (INR) is calculated from the PT. The INR has no utility other than monitoring warfarin.
There are very few situations in which a PT will be requested as a standalone test.
If you wish to monitor warfarin please request an INR.
If the patient’s haemostatic function needs to be assayed eg in the setting of active bleeding, please request a coagulation screen and Clauss fibrinogen.
Tube
05 (CP) – Citrate
ID
Tests&Tubes0105
Additional information
The PT must be assayed within 24 hours of sample collection.
Turn around
A&E: N/A
Day Case: 6 Hours
In-Patient: 6 Hours
Out-Patient: 24 Hours
GP: 24 Hours
Send to
Blood Sciences Cross Site
Contact
For further details please contact Leeds Pathology customer services: [email protected].
Collection Con
Citrate tube must be filled to the fill line.
Instructions for Lab Staff: Standard lab processing- No special requirements.
Sample REQ
Blood