This study aimed to examine the performance of a collaborative skills scale for wound, ostomy, and continence nurse（WOCN）self-assessment developed by the authors, and to explore the scale’s efficacy as a self-learning tool. A cross-sectional survey of collaborative skills was conducted with WOCNs who had participated in a wound care seminar. Among full-time WOCNs, the median collaborative skills scores in all medical staff domains except for pressure ulcer management team member were highest in the group with 5-9 years of experience. Among part-time WOCNs, the higher median scores in all medical staff domains were associated with greater experience. Among full-time WOCNs, the medical staff domain with the lowest percentage was hospital managers for all groups, except for those with 3-4 years of experience. Among part-time WOCNs, the medical staff domain with the lowest percentage was hospital managers across all WOCN groups. These findings suggested that the scale was effective not only for the group with less than 10 years’ experience, but also for those with more than 10 years’ experience. Further, the median score of the group with 5-9 years’ experience was deemed most appropriate as the target collaborative skills score for full-time WOCNs. The target collaborative skills score for part-time WOCN still needs to be determined according to varying work situations. WOCNs were also found to require the support of hospital directors and nursing leaders to deliver efficient pressure management care. In sum, this self-assessment was a valid tool for determining whether WOCNs are capable of exercising collaborative skills with medical staff.