Skip to content

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Find out more here. Hide this message

Laboratory Medicine

Test Directory / International Normalised Ratio (INR)

International Normalised Ratio (INR)

Citrated Plasma

TestInternational Normalised Ratio (INR)
Common AbbreviationsINR
Profile
Clinical IndicationCalculation derived from the Prothrombin Time (PT/MNPT^ISI). Used to monitor Warfain.
Specimen TypeBlood
Sample TypeCitrated Plasma
Minimum Volume1 x 3mL (adult) 1 x 1mL (paed) (citrated plasma must be filled to bottle line)
Special PrecautionsOnly use for Warfarin monitoring.
Stability24 hrs at room temp
Turnaround Time1 hour (urgent) 4 hours (routine)
LaboratoryYork & Scarborough Hospital
Reference IntervalN/A
LimitationsHaemolysis, gross lipaemia, high haematocrit may interfere with measurement. Over or under filled samples cannot be used due to ratio between blood and citrate
Additional Information
Logo on blue with swoosh

Fundraising

Chinese Poland

View all languages >