Pathology Handbook

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INR

Alternative Names:PT
Prothrombin Time
Laboratory:Haematology
Test Code:INR
Specimen Types:Plasma
Container Types:
Sodium Citrate
Collection & Request Instructions:Add exactly 2.7 mL of blood & mix by inversion.

Prothrombin activity is expressed as the International Normalised Ratio (INR).

Specimens cannot be analysed or re-analysed greater than 8 hours after collection.

Transport Instructions between Sites and/or Laboratories:Room Temperature
Additional Notes:

Reference Range: 0.9-1.3

Therapeutic Ranges:

Prophylaxis for atrial fibrillation                2.0-3.0

Treatment of deep vein thrombosis         2.0-3.0

Tissue heart valve replacement                2.0-3.0

Mechanical heart valve replacement        2.5-3.5