What does fibrinolysis mean?
Fibrinolysis is the biological process by which the body breaks down and removes fibrin, the tough protein meshwork that gives blood clots their structure. Once a wound has healed and a clot is no longer needed, enzymes—chiefly plasmin, activated from its precursor plasminogen—systematically digest the fibrin strands, dissolving the clot and restoring smooth blood flow through the vessel. The word derives from 'fibrin', the clot-forming protein itself, combined with the Greek-derived '-lysis', meaning dissolution or loosening. Almost entirely confined to medicine, physiology, and biochemistry, fibrinolysis appears most often in discussions of cardiovascular health: impaired fibrinolysis can contribute to inappropriate clotting and thrombosis, while excessive fibrinolysis can cause dangerous bleeding. Clinically, the term also describes thrombolytic ('clot-busting') therapy, in which drugs deliberately accelerate this natural mechanism to dissolve life-threatening clots during heart attacks and ischemic strokes. Understanding fibrinolysis therefore means understanding the body's delicate counterbalance between clotting and cleanup.
nounThe natural enzymatic process by which fibrin, the protein that forms the meshwork of blood clots, is gradually broken down and dissolved in the body.
- The physiological enzymatic degradation of fibrin in blood clots, mediated chiefly by the enzyme plasmin, which restores blood flow once healing has occurred.
- In medicine, the therapeutic acceleration of this process using drugs such as tissue plasminogen activator (tPA) to dissolve dangerous clots in heart attack or stroke patients.
"After the wound had healed, fibrinolysis slowly dissolved the clot and restored normal blood flow through the vessel."
"The laboratory measured the patient's fibrinolysis to assess why her clots were dissolving abnormally quickly."
"Emergency physicians relied on drug-induced fibrinolysis to reopen the blocked coronary artery within the critical first hours of the heart attack."
Your body dissolves its own blood clots using an enzyme called plasmin — a cleanup process called fibrinolysis that runs constantly, keeping every healed vessel open without you ever noticing.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fibrinolysis
Fibrinolysis combines 'fibrin'—the insoluble protein formed from fibrinogen during blood coagulation, named in the early 19th century from Latin 'fibra' meaning fibre—with the Greek suffix '-lysis', meaning loosening or dissolution. The term thus literally describes the 'dissolution of fibrin'. It shares its '-lysis' element with words such as analysis, electrolysis, and paralysis, all built on the same Greek root 'lyein', to loosen or break down.
Related word forms
How fibrinolysis is actually used
A technical term used almost exclusively in medical, physiological, and biochemical contexts; it rarely appears in general conversation. In clinical literature, 'fibrinolysis' may refer either to the natural bodily process or to therapy that enhances it, so context matters when reading medical texts.
Easily confused with fibrinolysis
Hemostasis is the overall process of stopping bleeding, including clot formation, whereas fibrinolysis is the later stage in which the formed clot is broken down.
Fibrillation refers to rapid, irregular muscle contractions (as in the heart), while fibrinolysis is the dissolution of fibrin blood clots.