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Prothrombin Time (PT), Plasma
Test Code1009
CPT Codes
85610
Includes
Includes international normalized ratio (INR)
Preferred Specimen
Container/Tube: Light blue-top (citrate) tube-Grossly hemolyzed, clotted blood, or an insufficient specimen is not acceptable.
Specimen Volume: Full tube
Collection Instructions: Blood to anticoagulant ratio is critical.
Note: 1. Results may be affected by hematocrit >55%. 2. Tube should remain stoppered. 3. Specimen cannot be drawn from heparinized line.
Transport Temperature
Refrigerate
Specimen Stability
Room temperature: 24 hours
Refrigerated: 24 hours
Refrigerated: 24 hours
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Grossly hemolyzed, clotted blood, a specimen over 24 hours old, or an insufficient specimen is not acceptable.
Methodology
Clot Formation
Setup Schedule
Monday through Sunday
Reference Range
9.0-13.5 seconds
Critical values (automatic call-back): >20 seconds if not on anticoagulant therapy
INR: >5.0 if on anticoagulant therapy
Critical values (automatic call-back): >20 seconds if not on anticoagulant therapy
INR: >5.0 if on anticoagulant therapy
Clinical Significance
Useful for evaluation of extrinsic coagulation systems: factor II, V, VII, and X, and for monitoring anticoagulant therapy.
Performed By
CoxHealth
