Chemicals and Drugs

Factor XIa

Activated form of factor XI. In the intrinsic pathway, Factor XI is activated to XIa by factor XIIa in the presence of cofactor HMWK; (HIGH MOLECULAR WEIGHT KININOGEN). Factor XIa then activates factor IX to factor IXa in the presence of calcium.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

Activated form of factor XI. In the intrinsic pathway, Factor XI is activated to XIa by factor XIIa in the presence of cofactor HMWK; (HIGH MOLECULAR WEIGHT KININOGEN). Factor XIa then activates factor IX to factor IXa in the presence of calcium.

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Synonyms

8 entry terms
  • Activated Factor XI
  • Blood Coagulation Factor XI, Activated
  • Coagulation Factor XIa
  • Contact Activation Product
  • Factor 11A
  • Factor Eleven A
  • Factor XI, Activated
  • Factor XIa, Coagulation

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Aspects Covered

28 allowable subheadings

Indexed with the subheadings administration & dosage, adverse effects, agonists, analysis, antagonists & inhibitors, biosynthesis, cerebrospinal fluid, chemical synthesis, chemistry, classification, drug effects, economics, genetics, history, immunology, isolation & purification, metabolism, pharmacokinetics, pharmacology, physiology, poisoning, radiation effects, standards, supply & distribution, therapeutic use, toxicity, ultrastructure, urine.

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Indexing Annotation

/defic = FACTOR XI DEFICIENCY

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History Note

90

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Previous Indexing

  • Factor XI (1972-1989)
  • Serine Proteinases (1988-1989)

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AMA Style

References

  1. National Library of Medicine. Factor XIa. Medical Subject Headings (MeSH). 2026. Unique ID D015945. http://id.nlm.nih.gov/mesh/2026/D015945
  2. Factor XIa. In: Wikidata. https://www.wikidata.org/wiki/Q50259279