What is the first step to take when casting a patient with an open ulcer?

In the process of casting a patient with an open ulcer, the initial step involves putting on gloves to ensure proper hygiene and minimize the risk of infection. Protecting oneself with gloves is crucial when dealing with any open wound, as it prevents contamination from pathogens that could be present on the skin or in the environment. This step is essential for both the safety of the clinician and the well-being of the patient, as open ulcers are susceptible to infection, which can complicate healing and overall treatment outcomes.

Moving forward with steps such as positioning the foot, marking the ulcer's location, or applying sanitizer is important, but they follow the foundational requirement of ensuring a sanitary work environment and protecting both the clinician and patient through the use of gloves. Without this first step, the subsequent actions could compromise the integrity of the treatment process.