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Test Code PTINR Prothrombin Time (PT) and INR, Plasma

Methodology

Mechanical Clot Detection

 

Useful as an assay for specific extrinsic coagulation factors; as a monitoring test for oral anticoagulant therapy, and for detection of single or combined deficiencies of the extrinsic coagulation pathway, indicative of hereditary and acquired coagulation disorders, liver disease, or vitamin K deficiency. 

Specimen Requirements

Container/Tube: Light blue-top (3.2% sodium citrate) tube

Clotted blood or an insufficient specimen is not acceptable.

Specimen Volume: Full tube (90%) of plasma

Collection Instructions: Do not centrifuge. Avoid hemolysis.
Note:

1. Draw a discard tube prior to light blue-top (3.2% sodium citrate) tube.

2. Tube should remain stoppered.

Day(s) Test Set Up

Monday through Sunday

Reference Values

Level of Therapy 

Target Range

   

Standard Dose

(treatment of venous thrombosis; treatment of
pulmonary embolus; prophylaxis against venous thrombosis or
systemic embolization) 

 2.0-3.0

High Dose
(high-risk with mechanical heart values) 

2.3-3.5 

INR is only applicable for patients on
STABLE ORAL ANTICOAGULANTS.

Critical Value: ≥5.0

 

Test Classification and CPT Coding

85610

Performing Laboratory

Beebe Healthcare Laboratory

Performing Location

Margaret H. Rollins Laboratory
South Coastal Campus Laboratory 
Specialty Surgical Hospital Laboratory

Specimen Transport Temperature

Room Temperature