Preoperative Bleeding Time (BT) and Clotting Time (CT) tests are expected to detect occult haemostatic disorders. Conversely it is assumed that normal BT-CT results exclude haemostatic disorders. This presumption is the basis of selecting BT-CT as the screening tests.
The normal bleeding time is between 2-7 minutes. The normal clotting time in a person is between 8-15 minutes. By understanding the time taken for blood to clot, it can be determined if the person has haemophilia or von Willibrand’s disease.
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