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Test & Collection Guide

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Prothrombin Time

Ordering information:

Warfarinsied outpatients can use a "Rule 3 Exemption" request to allow multiple INR collections to be made using the one request form.

Please click here for a link to the Rule 3 Exemption Request Form

Alternate names:
DINR, INR, PT
Laboratory:
Coagulation
Test Code:
INR, DINR
Specimen types:
Plasma
Container types:
Sodium CitrateSodium Citrate
Collection Instructions:
Transport specimen at Room Temperature to lab

Filled to label marker and mixed by inversion.

Patient Information - Warfarin Management

 

Frequency:
Daily
Result Turnaround Time:
2 hours
Reference Interval:

Prothrombin Time is expressed as the International Normalised Ratio (INR)

0.8 - 1.2 INR

Prophylaxis for atrial fibrillation 2.0 - 3.0 INR
Treatment of deep vein thrombosis 2.0 - 3.0 INR
Tissue heart valve replacement 2.0 - 3.0 INR
Mechanical heart valve replacement 2.5 - 3.5 INR
Anti-phospholipid syndrome 2.0 - 3.0 INR
Laboratory Use Only
Storage Instructions:

Specimens for PT-INR assays centrifuged with plasma remaining on top of the cells in an unopened tube kept at room temperature may be tested within 24 hours from time of specimen collection. 

Transport Instructions:

DINR -Rule 3 Exemption Request Form