Sign in →

Test Code PT Prothrombin Time (PT), Blood

Methodology

ACL TOP 500 Turbidimetric

Performing Laboratory

Sky Lakes Medical Center-Coagulation

Specimen Requirements

Specimen Type: Blood Container/Tube: Light-blue top (3.2% sodium citrate) Specimen Volume: 90% full tube Collection Instructions: 1. When using butterfly, draw a discard tube prior to sodium citrate tube. 2. Invert several times to mix blood. 3. Do not centrifuge. 4. Tube must remain stoppered. 5. Avoid grossly hemolyzed, icteric, or lipemic specimen. Clotted or hemolyzed blood or an insufficient specimen is not acceptable.

Specimen Transport Temperature

Ambient

Reference Values

PT 9.4-10.7 seconds INTERNATIONAL NORMALIZED RATIO (INR) 0.9-1.1 Recommended ranges of INR for oral anticoagulant therapy are: 2.0 to 3.0 for treatment and/or prevention of acute myocardial infarction, venous thrombosis, pulmonary embolism, systemic embolism, valvular heart disease, atrial fibrillation, recurrent systemic embolism, and tissue heart valve; and 2.5 to 3.5 for mechanical prosthetic heart valves.Critical value (automatic call-back): 4.5

Day(s) Test Set Up

Monday through Sunday Available STAT

Test Classification and CPT Coding

85610

Test Order Code

LAB320