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Updated: Nov 12, 2025

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
Published on: September 9, 2012
Unrecognized blood clotting factors
Hidehiko Saito1, Tetsuhito Kojima2
1National Hospital Organization Nagoya Medical Center, 4-1-1 Sanno-maru, Naka-ku, Nagoya, 460-0001, Japan. hi.saito@nnh.hosp.go.jp.
This review examines unapproved clotting factors, clarifying their identities to prevent confusion in coagulation disorder research. It aims to distinguish these factors from already identified ones.
Area of Science:
- Hematology
- Biochemistry
- Medical Genetics
Background:
- Clotting factors were historically identified through rare hereditary coagulation disorders.
- Inconsistent naming conventions arose, leading to the same factors having multiple names.
- An international committee was established to standardize clotting factor nomenclature.
Purpose of the Study:
- To review clotting factors lacking official authorization.
- To determine if these unapproved factors are identical to known clotting factors.
Main Methods:
- Literature review of historical and current research on clotting factor nomenclature.
- Analysis of functional and biochemical data for unapproved clotting factors.
- Comparison of characteristics of unapproved factors with established clotting factors.
Main Results:
- Several clotting factors remain unassigned or lack official authorization.
- Preliminary analysis suggests some unapproved factors may be distinct entities.
- Further investigation is needed to definitively characterize these factors.
Conclusions:
- Standardizing clotting factor nomenclature is crucial for clear scientific communication.
- Clarifying the identity of unapproved factors will aid in understanding coagulation pathways.
- This review highlights the ongoing need for nomenclature refinement in hematology.
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