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Laboratory evaluation of platelet dysfunction

R L Bick1

  • 1Presbyterian Hospital of Dallas, University of Texas, Southwestern Medical Center, Texas.

Clinics in Laboratory Medicine
|March 1, 1995
PubMed
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Platelet dysfunction, both inherited and acquired, can cause bleeding. Prompt diagnosis and treatment, often with platelet concentrates, are crucial for managing hemorrhage.

Area of Science:

  • Hematology
  • Clinical Medicine
  • Pathology

Background:

  • Platelet dysfunction is a frequent cause of hemorrhage, particularly acquired forms linked to trauma, surgery, or medications.
  • While hereditary platelet function defects are rare, hereditary storage pool disease warrants suspicion in pediatric cases with specific clinical signs.
  • Acquired platelet defects, often drug-induced, are common and should be considered in patients with unexplained bruising or bleeding.

Purpose of the Study:

  • To review the causes, diagnosis, and management of platelet function defects.
  • To highlight the clinical significance of both hereditary and acquired platelet disorders.
  • To emphasize appropriate diagnostic testing and therapeutic strategies for hemorrhage due to platelet dysfunction.

Main Methods:

Related Experiment Videos

  • Review of literature on platelet function defects.
  • Discussion of diagnostic utility of template bleeding time and platelet aggregation tests.
  • Outline of therapeutic approaches including platelet transfusions and management of underlying causes.

Main Results:

  • Template bleeding time is a useful screening test but can be unreliable in certain clinical scenarios.
  • Platelet aggregation or lumi-aggregation tests are recommended for applicable clinical situations when dysfunction is suspected.
  • Prolongation of bleeding time is not a definitive predictor of bleeding risk.

Conclusions:

  • Prompt recognition of platelet dysfunction is essential for effective hemorrhage management.
  • Treatment for significant bleeding involves platelet concentrate infusions.
  • Management of acquired defects requires addressing the underlying cause and discontinuing offending drugs.