Non-Dosed INR

Pathology category

Haematology

Code

I

Referral code

Request form

Test information

Must be analysed within 24 hours of collection

Guidelines

Pre-analytical

Sample transport should be at 4-25C and reach the laboratory ASAP

Please note: samples >24 hours old will be rejected by the laboratory

Reference range

PT Ratio (AKA INR) = 0.8 – 1.2

Please note: Reference is dependant upon clinical condition and whether patient is on anticoagulation medication as these patients may have a different normal therapeutic range

Tube type

Tube type info

2.7ml blue top citrate

1.8ml blue top citrate paediatric bottle

Special requirements

Minimum volume

1 tube minimum 90% full (to the thick black line on the sample bottle) – this is essential to ensure correct ratio of anticoagulant to blood ratio (1:9 ratio)

Assay frequency

Routine

TAT Inpatient (urgent)

1 hour

TAT Inpatient

4 hours

TAT GP/Outpatient

4 hours

Referral lab

local