Related Experiment Video
Updated: Jul 6, 2026

Tail Vein Transection Bleeding Model in Fully Anesthetized Hemophilia A Mice
Published on: September 30, 2021
Can we predict bleeding?
1Aberdeen Royal Infirmary and University of Aberdeen, Aberdeen, Scotland. Henry.Watson@arh.grampian.scot.nhs.uk
The prior identification of subjects who are likely to bleed excessively when subjected to operative surgery and other invasive procedures is desirable. Frequently, reliance is placed on laboratory-based screening tests of blood coagulation for this purpose. However, published evidence does not support this approach as the tests are not fit for purpose, and their sensitivity and specificity are low. Some more global assays may have use in the diagnostic workup in subjects with hemorrhage, but none has been established to date as an efficient method for prediction of bleeding in unselected populations. There is renewed interest in the use of the clinical history for the prediction of bleeding. Recent reports suggest that when a structured questionnaire is employed to derive a bleeding score, the positive predictive value of the approach for the detection of bleeding disorders is high.
The prior identification of subjects who are likely to bleed excessively when subjected to operative surgery and other invasive procedures is desirable. Frequently, reliance is placed on laboratory-based screening tests of blood coagulation for this purpose. However, published evidence does not support this approach as the tests are not fit for purpose, and their sensitivity and specificity are low. Some more global assays may have use in the diagnostic workup in subjects with hemorrhage, but none has been established to date as an efficient method for prediction of bleeding in unselected populations. There is renewed interest in the use of the clinical history for the prediction of bleeding. Recent reports suggest that when a structured questionnaire is employed to derive a bleeding score, the positive predictive value of the approach for the detection of bleeding disorders is high.
Related Concept Videos
Disorders of Hemostasis
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
Epistaxis
Etiology
Possible causes of this condition include high blood pressure, trauma, low humidity, upper respiratory tract infections, allergies, foreign bodies, nasal inhalation of corticosteroids or illicit drugs, excessive use of decongestant nasal sprays, facial or nasal surgery, anatomic malformation, tumors, or systemic...
Esophageal Varices-II: Clinical Features and Management
In the initial assessment, a thorough review of the patient's medical history is vital to identify risk factors such as liver disease, alcohol abuse, or...
Hemorrhagic Stroke l: Introduction
Venous Thrombosis IV: Nursing Management
Extrinsic and Intrinsic Pathways of Hemostasis
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
