Welcome to the Exeter Clinical Laboratory International website
NHS logo

INR (International Normalised Ratio)

Blood Sciences Test


Specimen

Sodium citrate tube

Special Instructions

Ideally specimens should be received in the laboratory on the day of venepuncture but may be stored at room temperature overnight if a delay is unavoidable.

Factors affecting results

As with all coagulation tests the tubes must not be underfilled. Haemolysis should be avoided. Mix the tube by inversion. Do not shake.

Reference Ranges

INR CLINICAL STATE
2.5

Treatment of DVT or pulmonary embolism

Artrial fibrillation

Cardioversion

Dilated cardiomyopathy

Myocardial infarction

3.5

Recurrent DVT and PE

Mechanical prosthetic heart valves

Test Usage

Oral anticoagulation control

Turnaround time

Routine     1-2hrs

Urgent      < 1 hour

Availability

In House

Clinical Advice

Clinical advice is available from the Haematology Medical team (contact RD&E switchboard on 01392 411611)

 

Specimen Labelling Procedure
University of Exeter logo
A UKAS Accredited Medical Laboratory

8210

RD&E logo