Definition

Biallelic variants in F13A1 (responsible for the majority of hereditary deficiencies) or, more rarely, in F13B render factor XIII, the transglutaminase enzyme that stabilizes the clot, nonfunctional. Factor XIII levels are typically below 5 percent of normal; delayed umbilical cord bleeding, soft tissue or intracranial hemorrhage, and impaired wound healing are observed.

Gene/region examined

FXIII - V34L

Method

Sequence analysis

Accepted sample types

EDTA blood, AF, CVS

Inheritance

Hereditary, autosomal recessive.

Related Tests

Inheritance Patterns

Describes how a genetic condition is passed on within a family. There are five main patterns

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Carrier (Heterozygous / Homozygous)

Why it matters: In autosomal recessive inheritance, when each parent is a carrier (while both appear healthy), the chance of their child being born with the disease is 25% in each

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VUS (Variant of Uncertain Significance)

This is the situation where the test has detected a change in the DNA, but the role of this change in the development of disease is unconfirmed.

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How to Read a Genetic Test Result (Positive / Negative / VUS)

A genetic test result falls into three main categories

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Types of Genetic Tests

A genetic test is a type of medical test that detects changes in genes, chromosomes or proteins. Today there are more than 77,000 genetic tests available.

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