Northern Devon Healthcare NHS Trust > Pathology Laboratory Handbook > Departments > Haematology > Haematology Tests > Prothrombin Time, PT

Prothrombin Time, PT

Name	Prothrombin Time, PT
Tube Type	Blue (Sodium Citrate)
Reporting Units	PT secs INR ratio
Reference Range	13 – 16 s INR 0.9 – 1.1
Availability	NDDH (24/7)
Target turnaround time	2 hours
Special requirements & notes	–
Patient preparation	N/A
Volume required	1 tube (2.7ml) must be full
If delayed transport to lab, store:	In refrigerator 2 – 8^oC
Factors affecting result interpretation	Clotted sample, underfilled samples
Time limit for add on test	24 Hours
Pathology discipline	Haematology
‘Lab Tests Online’ link	https://labtestsonline.org.uk/tests/pt

Last updated: May 27, 2020

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