Search for a rare disease

* (*) mandatory field

Other search option(s)

Suggest an update

(*) Required fields.


Only comments seeking to improve the quality and accuracy of information on the Orphanet website are accepted. For all other comments, please send your remarks via contact us. Only comments written in English can be processed.

Orphanet doesn't provide personalised answers. To get in touch with the Orphanet team, please contact

Information provided in your contribution (including your email address) will be stocked in .CSV files that will be sent as an email to Orphanet's teams. These emails might be conserved in the teams' mailboxes, in our backoffice servers but will not be registered in our databases (for more information see our section General Data Protection Regulation and data privacy (GDPR) and Confidentiality).

Captcha image

Alpha delta granule deficiency

Disease definition

A rare hemorrhagic disorder due to a constitutional platelet anomaly characterized by moderate to severe deficiency in both platelet alpha-granules and dense bodies, resulting in impaired platelet function and decreased aggregation responses. Patients present increased bleeding tendency with symptoms like easy bruising, or menorrhagia.


Classification level: Disorder
  • Synonym(s):
    • Alpha dense granule deficiency
    • Combined alpha-delta platelet storage pool deficiency
  • Prevalence: -
  • Inheritance: Autosomal dominant or Autosomal recessive 
  • Age of onset: -
  • ICD-10: D69.1
  • ICD-11: 3B62.4
  • OMIM: 185050
  • UMLS: C5680090
  • MeSH: -
  • GARD: -
  • MedDRA: -

Detailed information


ERN produced/endorsed by ERN(s)   FSMR produced/endorsed by FSMR(s)
The documents contained in this web site are presented for information purposes only. The material is in no way intended to replace professional medical care by a qualified specialist and should not be used as a basis for diagnosis or treatment.