Adult patients with dermatomyositis from an academic tertiary referral centre experienced a range in durations of diagnostic delay, which were dependent on social, disease and diagnostic factors. About one-quarter of patients experienced a diagnostic delay ≥ 12 months, with a median of 3.5 months. Symptoms at initial presentation, zip code, skin biopsy results and treatment with systemic corticosteroids were associated with diagnostic delay duration.

Social, Disease, and Diagnostic Factors Associated with Diagnostic Delays in Dermatomyositis: A Retrospective Cohort Study