Specimen Collection

2.7 mL Citrate Blood

or

1.8 mL Citrate Blood

• Tube must be adequately filled.

Reference Intervals
Units: Units

Age Range	Either Sex
All	0.8 - 1.2[1]

[1] Uncertainty of Measurement: 14%
Turnaround Time:

Only available 0800-1700 on weekdays.

• Test will only be done out of hours on special request.

Diagnostic Use and Interpretation

Used to differentiate a raised prothrombin ratio due to vitamin K deficiency/warfarin therapy from a coagulation protein deficiency.

Interpretation

Raised PR, normal Fibrinogen, normal Echis ratio: Vitamin K deficiency, Single or Combined Factor VII Deficiency/Factor X Deficiency/Factor V Deficiency.

Raised PR, normal Fibrinogen, raised Echis ratio: Factor II Deficiency acquired (liver disease) or congenital..

Contact Information

For further information contact the Haematology laboratory (Ext 22067) or:

Dr Nicola Eaddy	Ext 22005
Dr Peter Bradbeer	Ext 22062
Dr Anna Ruskova	Ext 22137
Dr Nikhil Rabade	Ext 22071

Last updated at 13:09:28 11/09/2024