AsseyMethod: Coagulation
Abbrevation: PT
Sector: Hematology
SampleType: PC
S.Vol: -
Transport: at 2-8˚c, -20˚c,-70˚c
Storage: The same time must be analysis , 2 w. at -20˚c,6 m. at -70˚c
Test Name: Prothrombin Time - INR
Normal Range: 11.0-14.0
To help diagnose a bleeding disorder; to help estimate the severity of liver disease. A tightly controlled version of the PT called the International Normalised Ratio (INR) is used to measure the effect of anticoagulant drugs such as warfarin.
No test preparation is needed. If the patient is receiving anticoagulant therapy, the specimen should be collected before the daily dose is taken. It is essential the blood is taken quickly and smoothly and that the anticoagulant bottle is filled exactly to the designated mark or the result may be inaccurate.
A blood sample taken from a vein in the arm
None needed, although if you are receiving anticoagulant therapy, the sample should be collected before taking your daily dose.
The test measures how long it takes for your blood to begin to form clots. Prothrombin is a plasma protein produced by the liver. Clotting is caused by a series of clotting factors which activate each other, including the conversion of prothrombin to thrombin. The test used to measure the activity of this clotting factor is called the prothrombin time, or PT.
How is the sample collected for testing?
Blood is collected by needle from a vein in the arm.
Is any test preparation needed to ensure the quality of the sample?
No test preparation is needed. If the patient is receiving anticoagulant therapy, the specimen should be collected before the daily dose is taken. It is essential the blood is taken quickly and smoothly and that the anticoagulant bottle is filled exactly to the designated mark or the result may be inaccurate.