Test Catalog

Test ID: F2NGS    
F2 Gene, Next-Generation Sequencing, Varies

Useful For Suggests clinical disorders or settings where the test may be helpful

Ascertaining a causative alteration in F2 and the affected region of prothrombin protein in an individual clinically diagnosed with factor II deficiency


Carrier testing for close family members of an individual with a factor II deficiency diagnosis


This test is not intended for prenatal diagnosis.

Genetics Test Information Provides information that may help with selection of the correct genetic test or proper submission of the test request

This test detects pathogenic alterations in the F2 gene to delineate the underlying molecular defect in a patient with a laboratory diagnosis of factor II (prothrombin) deficiency (F2D).

The gene target for this test is:

Gene name (transcript): F2 (GRCh37 [hg19] NM_000506)

Chromosomal location: 11p11.2

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

The clinical workup for factor II deficiency (F2D) begins with special coagulation testing for factor II. See  F_2 / Coagulation Factor II Activity Assay, Plasma.


Genetic testing for F2D is indicated if:

-Prothrombin (factor II) activity is reduced (less than 80% of normal)

-Acquired causes of factor II deficiency have been excluded (eg, vitamin K deficiency, warfarin anticoagulation use, liver disease, etc)


Prothrombin antigen testing, to distinguish between type I and type II deficiencies, may be helpful in cases where genetic testing results yield variants of uncertain significance.

Special Instructions Library of PDFs including pertinent information and forms related to the test

Method Name A short description of the method used to perform the test

Custom Sequence Capture and Targeted Next-Generation Sequencing (NGS) followed by Polymerase Chain Reaction (PCR) and Sanger Sequencing when appropriate

NY State Available Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name Lists a shorter or abbreviated version of the Published Name for a test

F2 Gene, Full Gene NGS

Aliases Lists additional common names for a test, as an aid in searching

Factor II deficiency
Congenital prothrombin deficiency