Background: High technological environments can be challenging for children with autism spectrum disorders (ASD), because they can be sensitive to new environments, new faces and changes in daily routines. Those children are frequent visitors in those settings, and due to their heightened healthcare needs and their comorbidities, it could constitute a challenge for healthcare professionals to encounter those children. Exploring the healthcare professionals' experiences can contribute to facilitate the procedure for a child with ASD. Method: A qualitative descriptive retrospective design with a critical incident technique has been used to capture the situations. Twenty healthcare professionals were interviewed about situations affecting the procedure in the high-technology environments, defined as anaesthesia and radiology departments. Result: The findings revealed both favourable situations and unfavourable situations affecting the procedure in the high-technology environment. The situations described by the healthcare professionals often involved their interactions with the child and the parents. The interactions were influenced by the parents' attitudes to the procedure and also the healthcare professionals and the parents' different expectations on the procedure. Other experiences described by the healthcare professionals were the unpredictability in different situations. Those situations were related to the child's unpredictable behaviour in those environments and also to the unpredictable effect of premedication provided to the child. Moreover, the result revealed the organizational prerequisites for facilitating a procedure, such as not feeling any time pressure when leading a child through a procedure. Conclusions: Interactions between healthcare professionals, children with ASD and parents in the high-technology environment are complex. Unpredictability characterizes situations when leading a child with ASD through a procedure. This place demands on the healthcare professional, the environment and the organization.