raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:244242

HELLP syndrome

Synonyms: Hemolysis, elevated liver enzymes, low platelets in pregnancy · Hemolysis-elevated liver enzymes-low platelets syndrome

Type
Disease
Group
Disorder
Inheritance
Multigenic/multifactorial
Age of onset
Adult
Status
active

A rare hemorrhagic disorder due to an acquired platelet anomaly characterized by hemolysis, elevated liver enzymes and thrombocytopenia that affects pregnant or post-partum women, and is frequently associated with severe preeclampsia. Symptoms are variable, typically including right upper quadrant or epigastric abdominal pain, nausea, vomiting, excessive weight gain, generalized edema, hypertension, general malaise, right shoulder pain, backache, and/or headache. Hepatic hemorrhage and rupture, renal failure, and pulmonary edema can result in maternal and/or fetal death.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enHELLP syndromeHemolysis, elevated liver enzymes, low platelets in pregnancy · Hemolysis-elevated liver enzymes-low platelets syndrome
frSyndrome HELLPHémolyse, enzymes hépatiques élevées, thrombocytopénie pendant la grossesse
deHELLP-SyndromHämolysis mit erhöhten Leberwerten und niedrigen Thrombozytenzahlen in der Schwangerschaft · Hämolysis-erhöhte Leberwerte-niedrige Thrombozytenzahlen-Syndrom
esSíndrome HELLPHemólisis, enzimas hepáticas elevadas, disminución de las plaquetas en el embarazo · Síndrome de hemólisis-enzimas hepáticas elevadas-disminución de plaquetas
itSindrome HELLPEmolisi, aumento degli enzimi epatici, diminuzione delle piastrine durante la gravidanza · Sindrome emolisi-aumento degli enzimi epatici-diminuzione delle piastrine
nlHELLP-syndroomHemolyse, verhoogde leverenzymen, laag gehalte aan bloedplaatjes gedurende zwangerschap · Hemolyse - verhoogde leverenzymen - laag gehalte aan bloedplaatjes-syndroom
ptSíndrome HELLP
plZespół HELLPHemoliza, podniesiony poziom enzymów wątrobowych, niski poziom płytek krwi w ciąży · Zespół hemoliza-podniesiony poziom enzymów wątrobowych-niski poziom płytek krwi
csHELLP syndromHemolysis-elevated liver enzymes-low platelets syndrome · Hemolysis, elevated liver enzymes, low platelets in pregnancy · Syndrom zahrnující hemolýzu, zvýšené jaterní enzymy a nízké krevní destičky · Hemolýza, zvýšené jaterní enzymy, nízká hladina krevních destiček v těhotenství
ukHELLP-синдромГемоліз, підвищення рівня печінкових ферментів, низький рівень тромбоцитів під час вагітності · Синдром гемолізу - підвищення рівня печінкових ферментів - низького рівня тромбоцитів
zhHELLP综合征妊娠期溶血、肝酶升高、血小板减少
trHELLP sendromuHemoliz-yükselmiş karaciğer enzimleri-düşük trombosit sendromu · Hemoliz, yüksek karaciğer enzimleri, gebelikte düşük trombosit

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10O14.2Especificvalidated
ICD-11JA24.2Especificvalidated
MONDO0008585Evalidated
MeSHD017359Evalidated
UMLSC0162739Evalidated
GARD8528Evalidated
MedDRA10049058Evalidated

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 (3):

No children.

4

Genes

4 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
CD46Candidate gene tested inNot yet assessedHGNC:6953ENSG000001173351209201q32.2CD46 molecule17914026[PMID]
CFHCandidate gene tested inNot yet assessedHGNC:4883ENSG000000009711343701q31.3complement factor H18658028[PMID]_22594569[PMID]
CFICandidate gene tested inNot yet assessedHGNC:5394ENSG000002054032170304q25complement factor I18658028[PMID]_22594569[PMID]
HELLPARMajor susceptibility factor inAssessedHGNC:43984ENSG0000028134461498512q23.2HELLP associated long non-coding RNA23093777[PMID]
5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyValidatedORPHANET

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

32 annotations · validated 2019-04-08
HPOTerm (as annotated by Orphanet)Diagnostic
Obligate (100%)
HP:0002910Elevated circulating hepatic transaminase concentration
HP:0001873Thrombocytopenia
Very frequent (99-80%)
HP:0001878Hemolytic anemia
Frequent (79-30%)
HP:0012378Fatigue
HP:0007430Generalized edema
HP:0002315Headache
HP:0011900Hypofibrinogenemia
HP:0004324Increased body weight
HP:0008071Maternal hypertension
HP:0100602Preeclampsia
HP:0008151Prolonged prothrombin time
HP:0000093Proteinuria
Occasional (29-5%)
HP:0002027Abdominal pain
HP:0003418Back pain
HP:0025547Decreased mean corpuscular hemoglobin concentration
HP:0005521Disseminated intravascular coagulation
HP:0100601Eclampsia
HP:0410019Epigastric pain
HP:0003641Hemoglobinuria
HP:0002615Hypotension
HP:0025435Increased circulating lactate dehydrogenase concentration
HP:0001937Microangiopathic hemolytic anemia
HP:0002018Nausea
HP:0011419Placental abruption
HP:0002202Pleural effusion
HP:0001058Poor wound healing
HP:0100598Pulmonary edema
HP:0030834Shoulder pain
HP:0002013Vomiting
Very rare (<4-1%)
HP:0001919Acute kidney injury
HP:0001342Cerebral hemorrhage
HP:0011029Internal hemorrhage

Run the differential on the 3 obligate / very frequent terms

Annotation source: 30801473[PMID]_27181089[PMID]_10925900[PMID]

7

Sources for this card