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Related Concept Videos

Disorders of Hemostasis01:24

Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
Pedigree Analysis01:35

Pedigree Analysis

Overview
Blood Typing01:10

Blood Typing

Understanding an individual's blood group is a critical component of transfusion medicine. It ensures compatibility in blood transfusions, organ transplants, and even during pregnancy. Determining these blood groups involves the ABO and Rh blood typing systems, utilizing specific antigens and corresponding anti-sera to identify an individual's blood type.
Antigens are protein molecules that reside on the surface of red blood cells (RBCs). The ABO and Rh blood typing systems target antigens A,...
Pleiotropy01:33

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
Epistaxis01:30

Epistaxis

Epistaxis, or nosebleeds, occurs when small, swollen blood vessels in the nasal mucous membrane rupture. Typically, the anterior septum is the primary site of occurrence.
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...

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Related Experiment Video

Updated: May 20, 2026

Enumeration of Major Peripheral Blood Leukocyte Populations for Multicenter Clinical Trials Using a Whole Blood Phenotyping Assay
14:45

Enumeration of Major Peripheral Blood Leukocyte Populations for Multicenter Clinical Trials Using a Whole Blood Phenotyping Assay

Published on: September 16, 2012

Phenotyping bleeding.

Paula James1, Barry S Coller

  • 1Department of Medicine, Queen's University, Kingston, Ontario, Canada.

Current Opinion in Hematology
|July 5, 2012
PubMed
Summary
This summary is machine-generated.

New bleeding assessment tools (BATs) aid in diagnosing bleeding disorders and predicting surgical risks. While effective at ruling out disorders, their accuracy in confirming them needs improvement.

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Area of Science:

  • Hematology
  • Medical Diagnostics
  • Genetics

Background:

  • Phenotyping bleeding disorders lacks standardization, hindering precise diagnosis and risk assessment.
  • Historical records show phenotyping efforts for bleeding disorders span two millennia.
  • Standardization efforts have intensified over the last 50 years due to diagnostic and prognostic needs.

Purpose of the Study:

  • To review the development and application of new bleeding assessment tools (BATs).
  • To evaluate the role of BATs in assessing bleeding risks with new anticoagulant and antiplatelet therapies.
  • To explore the utility of BATs in evaluating thrombopoiesis-stimulating agents and gene-environment interactions.

Main Methods:

  • Development of novel bleeding assessment tools (BATs).
  • Implementation of web-based systems for collaborative phenotyping.
  • Validation of new BATs for clinical and research applications.

Main Results:

  • New BATs are designed for evaluating bleeding risks with novel anticoagulants and antiplatelet agents.
  • BATs assess the efficacy of thrombopoiesis-stimulating agents in immune thrombocytopenia.
  • Current data suggest BATs have high negative predictive value but low positive predictive value for bleeding disorders.

Conclusions:

  • Newly developed instruments aim to phenotype bleeding disorders for clinical and research objectives.
  • Improved standardization and collaborative research using BATs promise enhanced diagnostic and prognostic information.
  • Further validation is necessary, but advancements offer potential for maximizing scientific insights into bleeding conditions.