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 |
2.0-3.0 |
High Dose |
2.3-3.5 |
INR is only applicable for patients on |
|
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