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Lipedema is a chronic progressive disease characterized by disproportionate and symmetric adipose tissue accumulation, predominantly affecting women, with upper extremity involvement (Type IV) in approximately 30% of cases. This study aimed to evaluate ultrasound measurements of subcutaneous tissue thickness in the upper extremities of women with lipedema compared with matched controls and to establish diagnostic cutoff values for this region.MethodsCross-sectional case-control study including 102 women (51 with clinically diagnosed lipedema and 51 age- and BMI-matched controls). Bilateral ultrasound measurements were obtained at six standardized anatomical points on the upper extremities, and subcutaneous thickness was measured from the dermal-epidermal junction to the deep fascia. Receiver Operating Characteristic (ROC) curves were used to derive diagnostic cutoff values.ResultsSubcutaneous thickness was significantly greater in the lipedema group at all sites, independent of BMI (p < .05). The mid-arm region (10 cm distal to the axillary line) showed the best diagnostic performance (AUC 0.74; sensitivity 82.4%; specificity 51.9%; cutoff >11.4 mm), and four of the six points demonstrated good accuracy (AUC 0.73-0.74).ConclusionUltrasound using standardized anatomical points and defined cutoff values provides good discriminatory capacity for diagnosing upper extremity lipedema and represents an accessible and reproducible adjunct to clinical assessment.