Diagnosis and classification

How EDS is diagnosed: the Beighton score, the three-part 2017 hEDS criteria, genetic confirmation of the other types, and why older studies used different criteria.

By Hraness · Drafted with AI assistance.

• The 2017 hEDS criteria require hypermobility, systemic manifestations, and exclusion

  findingevidence: establishedone underlying source

  hEDS diagnosis under the 2017 International Classification requires (1) generalized joint hypermobility by Beighton score, (2) two or more of systemic manifestations, positive family history, or musculoskeletal complications, and (3) exclusion of other connective-tissue disorders. Unlike every other subtype, hEDS has no molecular confirmation test.

  hEDS, HSD · 2017-03 · Diagnosis and classification

• Twelve subtypes require molecular confirmation; hEDS remains clinical

  findingevidence: established

  Under the 2017 classification, definitive diagnosis of every subtype except hEDS relies on identifying a causative genetic variant. This asymmetry is the central classification problem: the most common type is the only one without a confirmatory test.

  all EDS types · 2017-03 · Diagnosis and classification

• HSD was created as the residual category beside hEDS

  findingevidence: established

  The 2017 framework (Castori et al.) separated symptomatic joint hypermobility into hEDS when the strict criteria are met and HSD when they are not. The boundary is contested. The criteria were designed to define a more uniform group for research, not to declare HSD benign, and the hEDS/HSD criteria review study is ongoing.

  HSD, hEDS · 2017-03 · Diagnosis and classification

• Criteria-era drift makes old and new EDS literature non-equivalent

  findingevidence: established

  Villefranche-era “EDS type III” cohorts (1997–2017) do not map cleanly onto 2017 hEDS. The 2017 criteria are stricter, and some people who met the older hypermobility-type criteria would now be diagnosed with HSD. Studies that mix eras need to be read with that in mind.

  all EDS types · Diagnosis and classification

• hEDS diagnosis remains clinical despite the KLK15 finding

  findingevidence: establishedindependent evidence agrees

  The Ehlers-Danlos Society says kallikrein (KLK) genes are not on EDS genetic testing panels and that hEDS remains a clinical diagnosis, and that further studies, including the HEDGE study, are needed to replicate the KLK15 finding. The KLK15 authors say their study does not propose a diagnostic framework and that the absence of KLK15 variants should not rule out a clinical diagnosis.

  hEDS · 2025-08 · Diagnosis and classification