raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:3325

Classic heparin-induced thrombocytopenia

Synonyms: Classic HAT · Classic HIT · Classic heparin-associated thrombocytopenia · HITT · Heparin-induced-immune thrombocytopenia

Type
Disease
Group
Disorder
Inheritance
Not applicable
Age of onset
All ages
Status
active

A rare drug-induced, immune-mediated prothrombotic disorder associated with thrombocytopenia and venous and/or arterial thrombosis.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enClassic heparin-induced thrombocytopeniaClassic HAT · Classic HIT · Classic heparin-associated thrombocytopenia · HITT · Heparin-induced-immune thrombocytopenia
frThrombopénie induite par l'héparine classiqueTIH classique · Thrombocytopénie héparino-induite classique · Thrombocytopénie induite par l'héparine classique · Thrombopénie héparino-induite classique
deHeparin-induzierte Thrombozytopenie, klassischeImmunthrombozytopenie, Heparin-induzierte · Klassische HIT · Klassische Heparin-assoziierte Thrombozytopenie
esTrombocitopenia clásica inducida por heparinaTIH clásica · Trombocitopenia clásica asociada a heparina · Trombocitopenia inmune inducida por heparina
itTrombocitopenia indotta dall'eparinaHAT · HIT · Trombocitopenia indotta dall'eparina, tipo 2
nlKlassieke heparinegeïnduceerde trombocytopenieHITT · Heparinegeïnduceerde immuuntrombocytopenie · Klassieke HAT · Klassieke HIT · Klassieke heparinegeassocieerde trombocytopenie
ptTrombocitopenia clássica induzida por heparinaHAT clássica · HIT clássica · HITT · Trombocitopenia clássica heparina-associada · Trombocitopenia imune induzida por heparina
plMałopłytkowość indukowana heparynąHAT · HIT · Małopłytkowość indukowana heparyną typu 2 · Małopłytkowość wywołana heparyną
csHeparinem indukovaná trombocytopenieHAT · HIT · Heparinem indukovaná trombocytopenie, typ 2
ukГепарин-індукована тромбоцитопеніяHAT · Гепарин-асоційована тромбоцитопенія · Гепарин-індукована тромбоцитопенія типу 2 · HIT
zh肝素诱导性血小板减少症肝素诱导性血小板减少症2型
trHeparine bağlı trombositopeniHAT · HIT · Heparin-ilişkili trombositopeni · Heparin kaynaklı trombositopeni tip 2

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10D69.5NTBTattributedvalidated
ICD-113B64.12NTBTindexvalidated
MONDO0018048Evalidated
UMLSC0272285Evalidated
GARD2650Evalidated
MedDRA10062506Evalidated

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

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyNot 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

15 annotations · validated 2019-04-23
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001973Autoimmune thrombocytopenia
HP:0100724Hypercoagulability
HP:0001907Thromboembolism
Frequent (79-30%)
HP:0004420Arterial thrombosis
HP:0002625Deep venous thrombosis
HP:0003144Increased serum serotonin
HP:0004936Venous thrombosis
Occasional (29-5%)
HP:0002637Cerebral ischemia
HP:0005521Disseminated intravascular coagulation
HP:0012649Increased inflammatory response
HP:0030248Mesenteric venous thrombosis
HP:0001658Myocardial infarction
HP:0002204Pulmonary embolism
HP:0001297Stroke
Very rare (<4-1%)
HP:0040231Abnormal onset of bleeding

Run the differential on the 3 obligate / very frequent terms

Annotation source: 29649767[PMID]_27230048[PMID]_30126928[PMID]_30284726[PMID]_30502310[PMID]

7

Sources for this card