FACTOR II DEFICIENCY

Scientifically reviewed | Last updated May 19, 2025
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F2

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Factor II (prothrombin) deficiency is the rarest blood factor deficiency.

 

Also called

Prothrombin deficiency

 

Symptoms

Hereditary factor II deficiency can manifest itself at any age, with severe forms of the disease present in childhood. The severity of symptoms can be correlated with the levels of Factor II activity.

 

Symptoms include:

 

  • Epistaxis (nosebleeds)
  • Menorrhagia (heavy menstrual bleeding)
  • Mucosal bleeding
  • Soft tissue bleeding
  • Hemarthrosis (joint bleeding)
  • Bleeding after tooth extraction, trauma, or surgery
  • Intracranial bleeding (severe deficiency)

 

Causes

It is caused by pathogenic variants in the F2 gene.

 

Frequency

The prevalence of the autosomal recessive form is estimated at 1:2 million, with both sexes affected.

 

Diagnosis

The diagnosis is based on prolonged prothrombin and activated partial thromboplastin time, as well as reduced factor II coagulation activity.

 

Differential diagnosis

Other bleeding disorders should be considered as differential diagnoses.

GENES
F2
HOW CAN YOU GET TESTED?
Step 1: Visit healthcare professional
Step 2: Sample collection (blood or buccal swab)
Step 3: Sequencing performed at our accredited laboratory
Step 4: Medical report
Step 5: Genetic counselling
FAQ

What is factor II deficiency?

What is prothrombin deficiency?

What are the symptoms of factor II deficiency?

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