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Other namesBlood clot
Blood clot diagram.png
Diagram of a thrombus (blood clot) that has blocked a blood vessel valve
SpecialtyVascular surgery
A thrombus, also called a blood clot, is the final product of the coagulation step in hemostasis. There are two parts to a thrombus: aggregated platelets and red blood cells that form a plug, and a mesh of cross-linked fibrin protein.

The substance making up a thrombus is sometimes called cruor.

A thrombus is a healthy response to injury to prevent bleeding, but can be harmful in thrombosis, when clots blocks blood flow through healthy blood vessels.[1][2]


  1. Kumar, Vinay; Abbas, Abul; Aster, Jon (2014). Robbins & Cotran Pathologic Basis of Disease (9th ed.). Philadelphia, PA: Elsevier. ISBN 9781455726134 . OCLC 879416939 . 
  2. "Venous thromboembolism (VTE) | McMaster Pathophysiology Review" (in en-US).