The WCA in medical terms most likely refers to the Work Capability Assessment.
The Work Capability Assessment (WCA) is not a medical diagnosis in itself, but rather an assessment designed to evaluate the impact of a person's health condition(s) or disability on their ability to work. It aims to determine what kind of work, if any, a person is capable of doing and what support they might need to do so.
Essentially, the WCA uses medical information provided by the claimant (person being assessed) and gathered by the assessment provider, to determine whether they meet specific criteria related to physical and mental functioning that affect their capacity for work. This assessment process then informs decisions regarding eligibility for certain benefits and support programs.
Therefore, while "WCA" is not a medical term in the sense of a diagnosis or treatment, it is a term relevant in the context of medical assessments related to work capacity.