Prothrombin Time (PT)/INR Test

* Definition: An INR is a calculation derived from the results of a PT test.
* PT Test: Measures the time it takes for a blood sample to clot.
* INR Values: Typically range from 0.8 to 1.1.

Blood Clotting Tests

Blood clotting tests assess proteins that influence blood clotting. They are commonly used:

* To evaluate bleeding and blood clotting risks
* To monitor patients taking anticoagulants (e.g., heparin, warfarin)

Types of Blood Clotting Tests:

* D-dimer Test: Detects a protein fragment released when blood clots break down.
* PT/INR Test: Assesses blood clot formation time.

False Results

Blood test results can be affected by various factors, leading to false high or low readings. These factors include:

* Improper handling of samples
* Presence of external substances in the blood (e.g., drugs, stress hormones)
* Physiological factors (e.g., estrogen levels during pregnancy)