raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:542657

Isolated hyperchlorhidrosis

Synonyms: Carbonic anhydrase XII deficiency

Type
Disease
Group
Disorder
Inheritance
Autosomal recessive
Age of onset
Infancy
Status
active

A rare genetic skin disease characterized by excessive salt wasting in sweat, leading to hyponatremic dehydration, hyperkalemia, and poor feeding and slow weight gain in infancy. Laboratory examination shows hyponatremia, hyperkalemia, increased aldosterone, and increased sweat chloride concentrations.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enIsolated hyperchlorhidrosisCarbonic anhydrase XII deficiency
frHyperchlorhidrose isoléeDéficit en anhydrase carbonique XII
deHyperchlorhydrie, isolierteCarboanhydrase XII-Mangel
esHiperclorhidrosis aisladaDeficiencia de anhidrasa carbónica XII
itIpercloridrosi isolata
nlGeïsoleerde hyperchlorhidroseKoolzuuranhydrase XII-deficiëntie
ptHipercloridrose isolada
plIzolowane nadmierne wydzielanie chlorków w pocie= en
csIzolovaná hyperchlorhidrózaDeficit karbonické anhydrázy XII
ukІзольований гіперхлоргідрозДефіцит карбоангідрази XII
zh孤立性高氯性多汗症碳酸酐酶XII缺乏症
trİzole hiperklorhidrozKarbonik anhidraz XII eksikliği

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM143860Evalidated
ICD-10L74.8NTBTattributedvalidated
ICD-11EE0YNTBTattributedvalidated
MONDO0007747Evalidated
UMLSC1840437Evalidated

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 (2):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
CA12Disease-causing germline mutation(s) inAssessedHGNC:1371ENSG0000007441060326315q22.2carbonic anhydrase 1221035102[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families13 casesWorldwideCase(s)Validated21035102[PMID]_26911677[PMID]_21184099[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_21035102[PMID]_26911677[PMID]_21184099[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