raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:466026

Class I glucose-6-phosphate dehydrogenase deficiency

Synonyms: Class I G6PD deficiency · Severe hemolytic anemia due to G6PD deficiency

Type
Disease
Group
Disorder
Inheritance
X-linked recessive
Age of onset
Neonatal
Status
active

A rare constitutional hemolytic anemia due to an enzyme disorder characterized by severe glucose-6-phosphate dehydrogenase deficiency (typically <10% residual enzyme activity) associated with chronic non-spherocytic hemolytic anemia of highly variable severity. Patients are at risk of developing neonatal jaundice (potentially leading to kernicterus), gallstones, and reticulocytosis and splenomegaly. They have an increased susceptibility to oxidizing agents provoking episodes of acute hemolysis. Favism, which describes the occurrence of an acute hemolytic reaction in response to the ingestion of fava beans, is more common in infants and young children.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enClass I glucose-6-phosphate dehydrogenase deficiencyClass I G6PD deficiency · Severe hemolytic anemia due to G6PD deficiency
frDéficit en glucose-6-phosphate déshydrogénase classe IAnémie hémolytique sévère par déficit en G6PD · Déficit en G6PD classe I
deGlukose-6-Phosphat-Dehydrogenase-Mangel der Klasse IKlasse-I-G6PD-Mangel · Schwere hämolytische Anämie durch G6PD-Mangel
esDeficiencia de glucosa-6-fosfato deshidrogenasa clase IAnemia hemolítica grave por deficiencia de G6PD · Deficiencia de G6PD clase I
itDeficit di glucosio-6-fosfato deidrogenasi di classe I
nlDeficiëntie van glucose-6-fosfaatdehydrogenase klasse 1Ernstige hemolytische anemie door G6PD-deficiëntie · G6PD-deficiëntie klasse 1
ptDéfice da glicose-6-fosfato desidrogenase classe I
plNiedobór dehydrogenazy glukozo-6-fosfatazy klasy ICiężka niedokrwistość hemolityczna spowodowana niedoborem G6PD · Niedobór G6PD klasy I
csDeficit glukóza-6-fosfát dehydrogenázy, třída IClass I G6PD deficiency · Severe hemolytic anemia due to G6PD deficiency · Deficit G6PD třída I · Těžká hemolytická anémie způsobená deficitem G6PD
ukДефіцит глюкозо-6-фосфатдегідрогенази I класуДефіцит G6PD класу I · Тяжка гемолітична анемія внаслідок дефіциту G6PD
zhI类葡萄糖-6-磷酸脱氢酶缺乏症G6PD缺乏导致的严重溶血性贫血
trSınıf I glikoz-6-fosfat dehidrojenaz eksikliğiSınıf I G6PD eksikliği · G6PD eksikliğine bağlı ağır hemolitik anemi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM300908NTBTvalidated
ICD-10D55.0NTBTattributedvalidated
ICD-113A10.00NTBTattributedvalidated
MONDO0010480Evalidated
MONDO10480Evalidated
UMLSC0272056Evalidated
GARD6520Evalidated

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
G6PDDisease-causing germline mutation(s) inAssessedHGNC:4057ENSG00000160211305900Xq28glucose-6-phosphate dehydrogenase7577654[PMID]
5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_20200584[PMID]

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