"Ex positive" is a term that is often used in medical and scientific contexts to refer to a previous positive result for a particular condition or test. However, there are a few different synonyms that can be used depending on the context and the specific wording that is preferred. Some possible alternatives to "ex positive" include "previously positive," "formerly positive," or "historically positive." Each of these phrases conveys a similar meaning to "ex positive" but may be more or less specific depending on the context and the intended audience. Ultimately, the choice of synonym will depend on the writer's style and the specific requirements of the situation.