Prothrombin Time (PT) (Serial Monitor)
Use
The Prothrombin Time (PT) test, especially in the context of serial monitoring, is used to evaluate the integrity of the extrinsic and common pathways of coagulation. It is particularly useful in monitoring patients on vitamin K antagonist therapy, such as warfarin, to maintain therapeutic levels and prevent complications. The PT test aids in determining the time it takes for blood to clot, which is crucial in assessing the bleeding risk and the effectiveness of anticoagulant treatment.
Special Instructions
The patient's Social Security number is required for monitoring. It is recommended to use only one assay method consistently to monitor each patient's therapy course, as values obtained with different methods should not be used interchangeably. To order this test without the serial monitor service, use test 005199.
Limitations
Values obtained from different methodologies cannot be used interchangeably, and the use of consistent methodology is crucial for accurate monitoring over time. The PT test can be influenced by multiple factors including patient medication adherence, dietary intake of vitamin K, liver function, and certain genetic factors. Additionally, reflex or confirmatory testing may be necessary under certain clinical conditions, which may extend the turnaround time.
Methodology
Automated Analyzer (Coagulation)
Biomarkers
LOINC Codes
- 5902-2
- 6301-6
- 80563-0
- 6301-6
- 5902-2
- 80563-0
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Plasma
Volume
Not provided
Minimum Volume
Not provided