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Disorders of Hemostasis

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Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
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Updated: Jun 21, 2026

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Published on: September 9, 2012

Congenital prothrombin deficiency.

Stefano Lancellotti¹, Raimondo De Cristofaro

¹Haemostasis Research Center, Department of Internal Medicine, Catholic University School of Medicine, 00168 Rome, Italy.

Seminars in Thrombosis and Hemostasis

|July 15, 2009

Summary

This summary is machine-generated.

Prothrombin deficiency, a rare inherited bleeding disorder, presents as low protein levels or a dysfunctional protein. Research details genetic mutations and clinical aspects of this condition.

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Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

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Published on: September 9, 2012

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Published on: May 23, 2025

Area of Science:

Hematology
Genetics
Molecular Biology

Background:

Prothrombin deficiency is an exceptionally rare inherited coagulation disorder, affecting roughly 1 in 2,000,000 individuals.
It manifests in two primary forms: hypoprothrombinemia (Type I) with low prothrombin activity and antigen, and dysprothrombinemia (Type II) with a dysfunctional protein.
Compound heterozygous defects can present with both hypoprothrombinemia and dysprothrombinemia.

Purpose of the Study:

To review the genetic basis of prothrombin deficiency.
To discuss the clinical manifestations and therapeutic strategies for congenital prothrombin deficiency.

Main Methods:

Identification and characterization of mutations in the prothrombin gene.
Analysis of genotype-phenotype correlations in affected individuals.

Main Results:

Forty distinct mutations have been identified in the prothrombin gene, with hotspots in the catalytic site and anion binding exosite I.
Mutations have also been found in the Na (+)-binding loop and the light A-chain.
The majority of mutations are missense, but nonsense mutations and single nucleotide deletions also occur.

Conclusions:

Understanding the genetic landscape of prothrombin deficiency is crucial for diagnosis and management.
Further research into genotype-phenotype relationships will refine therapeutic approaches for this rare bleeding disorder.