BabyScreen+ newborn screening

Gene: F7

Green List (high evidence)

Well established gene-disease association.

Variable severity.

Treatment: Recombinant coagulation Factor VIIa

Non-genetic confirmatory testing: factor VII level

Rated as 'strong actionability' in paediatric patients by ClinGen.

Clinical expression of factor VII deficiency is highly variable, and no consistent relationship has been found between the severity of the hemorrhagic syndrome and the residual levels of FVII activity. Individuals can be completely asymptomatic despite a very low FVII level. A bleeding history appears more predictive of further bleeding than the factor VII level. Factor VII levels increase during pregnancy, but levels usually remain insufficient for hemostasis in severely affected cases. Individuals with no history of bleeding do not appear to be at increased risk of PPH. Heterozygotes often have approximately half-normal levels of coagulation factors and are often asymptomatic. However, up to 2% of patients with severe bleeding phenotype are heterozygotes.

Consider prophylaxis using rFVIIa in certain circumstances. Long term prophylaxis should be considered for cases with a personal or family history of severe bleeding or with FVII activity <0.01 IU/ml using rFVIIa, adjusting to maintain clinical response. Short term prophylaxis should be considered for cases for neonates without a personal or family history of severe bleeding but who have FVII activity 0.01-0.05 IU/ml up to 6-12 months of age.

Created: 27 Dec 2022, 8:19 p.m. | Last Modified: 29 Dec 2022, 7:11 a.m.

Panel Version: 0.1721

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Factor VII deficiency, MIM# 227500