PROTHROMBIN TIME (PT) WITH INR

Test Code: 280Specimen Collection: Plasma
Component:


PT
INR
(International Normalized Ratio)

Method:


CLOT DET
CALC

Collection Notes: Draw to the proper fill level (do not overfill or underfill) because the correct ratio of blood to citrate is critical (9:1). Mix by gentle inversion 5-6 times. Hemolyzed or clotted specimens are not acceptable. Centrifuge and physically separate the plasma using a plastic transfer pipette into a separate plastic transfer tube, Freeze and transport frozen.
Clinical Utility: The measurement of PT is the method of choice for monitoring anticoagulant therapy with vitamin K antagonists (warfarin-type oral anticoagulant drugs, e.g., Coumadin), especially for preventing post-operative thrombosis and pulmonary embolism, and to screen for coagulation factor deficiency in hemorrhagic diseases.
CPT Code: 85610Testing Location: AML
SPECIMEN/STABILITY TYPE
Temperature:

Plasma Citrate

(Light Blue Top)

Ambient
 
24
 
Hours
Frozen
 
14
 
Days

Plasma pour off

(Light Blue Top)

Ambient
 
24
 
Hours
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