raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:169793

Severe hemophilia B

Synonyms: Severe congenital F9 deficiency · Severe congenital factor IX deficiency

Type
Clinical subtype
Group
Subtype of disorder
Inheritance
X-linked recessive
Age of onset
Infancy, Neonatal
Status
active

A severe form of hemophilia B characterized by a large deficiency of factor IX (biological activity <1 IU/dL) leading to frequent spontaneous hemorrhage and abnormal bleeding as a result of minor injuries or following trauma, surgery or tooth extraction. It primarily affects males but may also be observed in female carriers of disease-causing mutations.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enSevere hemophilia BSevere congenital F9 deficiency · Severe congenital factor IX deficiency
frHémophilie B sévèreDéficit congénital sévère en F9 · Déficit congénital sévère en facteur IX
deHämophilie B, schwereFaktor-IX-Mangel, kongenitaler, schwerer · Schwerer angeborener F9-Mangel
esHemofilia B graveDeficiencia grave congénita de F9 · Deficiencia grave congénita de factor IX
itEmofilia B graveDeficit congenito grave del fattore IX · Deficit congenito grave di F9
nlErnstige hemofilie BErnstige congenitale F9-deficiëntie · Ernstige congenitale deficiëntie van factor IX
ptHemofilia B graveDeficiência congénita grave de F9 · Deficiência congénita grave de factor IX
plCiężka hemofilia BCiężki Niedobór czynnika IX
csTěžká hemofilie BTěžký deficit faktoru IX
ukВажка форма гемофілії ВТяжкий вроджений дефіцит F9 · Тяжкий вроджений дефіцит фактора IX
zh重度血友病B型重度因子Ⅸ缺乏
trAğır hemofili BAğır faktör IX eksikliği

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM306900NTBTvalidated
ICD-10D67NTBTattributedvalidated
ICD-113B11.0NTBTindexvalidated
MONDO0015715Evalidated
UMLSC5679576Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

3

Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (1):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
F9Disease-causing germline mutation(s) inAssessedHGNC:3551ENSG00000101981300746Xq27.1coagulation factor IX
5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalence1-9 / 1 000 0000.8 / 100 000EuropeValue and classNot yet validatedORPHANET

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

6

HPO phenotypes

Orphanet has no HPO annotation for this code in this release.

7

Sources for this card