raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:71493

Familial thrombocytosis

Synonyms: Familial thrombocythemia · Hereditary thrombocythemia

Type
Disease
Group
Disorder
Inheritance
Autosomal dominant, X-linked recessive
Age of onset
Childhood
Status
active

Familial thrombocytosis is a type of thrombocytosis, a sustained elevation of platelet numbers, which affects the platelet/megakaryocyte lineage and may create a tendency for thrombosis and hemorrhage but does not cause myeloproliferation.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enFamilial thrombocytosisFamilial thrombocythemia · Hereditary thrombocythemia
frThrombocytose familialeThrombocytémie familiale · Thrombocytémie héréditaire
deThrombozytose, familiäreThrombozythämie, hereditäre
esTrombocitosis familiarTrombocitopenia familiar · Trombocitopenia hereditaria
itTrombocitosi familiareTrombocitemia ereditaria · Trombocitemia familiare
nlFamiliale trombocytoseErfelijke trombocytemie · Familiale trombocytemie
ptTrombocitose familiarTrombocitemia hereditária
plNadpłytkowość rodzinnaDziedziczna trombocytemia · Trombocytopenia rodzinna
csFamiliární trombocytózaFamiliární trombocytémie · Hereditární trombocytémie
ukСімейний тромбоцитозСімейна тромбоцитемія · Спадкова тромбоцитемія
zh家族性血小板增多症遗传性血小板增多症
trAilesel trombositozAilesel trombositemi · Kalıtsal trombositemi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM187950NTBTvalidated
OMIM601977NTBTvalidated
OMIM614521NTBTvalidated
OMIM620478BTNTvalidated
ICD-10D68.8NTBTattributedvalidated
ICD-113B63.0Especificvalidated
MONDO0019111Evalidated
UMLSC4303761Evalidated

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

3 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
JAK2Disease-causing germline mutation(s) (gain of function) inAssessedHGNC:6192ENSG000000969681477969p24.1Janus kinase 222397670[PMID]
THPODisease-causing germline mutation(s) (gain of function) inAssessedHGNC:11795ENSG000000905346000443q27.1thrombopoietin
MPLDisease-causing germline mutation(s) inAssessedHGNC:7217ENSG000001174001595301p34.2MPL proto-oncogene, thrombopoietin receptor
5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalence<1 / 1 000 000—WorldwideClass onlyNot yet validated23736217[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

24 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001892Abnormal bleeding
HP:0004420Arterial thrombosis
HP:0001894Thrombocytosis
HP:0004936Venous thrombosis
Frequent (79-30%)
HP:0002637Cerebral ischemia
HP:0100749Chest pain
HP:0002315Headache
HP:0000975Hyperhidrosis
HP:0003401Paresthesia
HP:0004950Peripheral arterial stenosis
HP:0000989Pruritus
HP:0001744Splenomegaly
HP:0002326Transient ischemic attack
Occasional (29-5%)
HP:0004808Acute myeloid leukemia
HP:0005506Chronic myelogenous leukemia
HP:0001260Dysarthria
HP:0002863Myelodysplasia
HP:0002092Pulmonary arterial hypertension
HP:0001250Seizure
HP:0005268Spontaneous abortion
HP:0001279Syncope
HP:0002321Vertigo
HP:0001123Visual field defect
HP:0001824Weight loss

Run the differential on the 4 obligate / very frequent terms

Annotation source: 11155408[PMID]

7

Sources for this card