Prothrombin Time
Code:
PT
Sample Type:
Blue top tube
Ref Ranges/Units:
Age related normal reference range:
0 days = 11.2 – 17.5 seconds
1 day = 10.5 – 17.0 seconds
5 days = 10.3 – 15.9 seconds
1 month = 10.6 – 15.8 seconds
3 months = 11.9 – 15.4 seconds
>6 months = 11.0 – 15.0 seconds
Age related normal reference range:
0 days = 11.2 – 17.5 seconds
1 day = 10.5 – 17.0 seconds
5 days = 10.3 – 15.9 seconds
1 month = 10.6 – 15.8 seconds
3 months = 11.9 – 15.4 seconds
>6 months = 11.0 – 15.0 seconds
Age related normal reference range:
0 days = 11.2 – 17.5 seconds
1 day = 10.5 – 17.0 seconds
5 days = 10.3 – 15.9 seconds
1 month = 10.6 – 15.8 seconds
3 months = 11.9 – 15.4 seconds
>6 months = 11.0 – 15.0 seconds
Turnaround:
Urgent requests < 90 mins Routine requests < 4hours
Special Precautions/Comments:
Additional Information:
Limitations/interfering substances: A Concentration of one volume citrate to nine volumes of blood must be achieved. The ratio of anticoagulant to blood is critical therefore under filled specimens must not be accepted. Samples which are under filled, over filled, clotted, icteric or haemolysedwill not be processed. Heparin contamination: Heparin levels above 1.0u/ml may affect results. Levels like this are regularly found in samples collected from renal; patients when the sample has been collected from a neck line or when the sample was collected post-dialysis. Limitations/interfering substances: A Concentration of one volume citrate to nine volumes of blood must be achieved. The ratio of anticoagulant to blood is critical therefore under filled specimens must not be accepted. Samples which are under filled, over filled, clotted, icteric or haemolysedwill not be processed. Heparin contamination: Heparin levels above 1.0u/ml may affect results. Levels like this are regularly found in samples collected from renal; patients when the sample has been collected from a neck line or when the sample was collected post-dialysis. Limitations/interfering substances: A Concentration of one volume citrate to nine volumes of blood must be achieved. The ratio of anticoagulant to blood is critical therefore under filled specimens must not be accepted. Samples which are under filled, over filled, clotted, icteric or haemolysedwill not be processed. Heparin contamination: Heparin levels above 1.0u/ml may affect results. Levels like this are regularly found in samples collected from renal; patients when the sample has been collected from a neck line or when the sample was collected post-dialysis.
South of Tyne & Wear Pathology Centre
