In relation to access to health care
services and in the terminology of Aday and Andersen, utilisation
reflects the extent to which "potential access" is converted into "realised access" (Aday & Andersen, 1981).
Aday, L.A. and Andersen, R.M., 1981. Equity of access to medical care: a conceptual and empirical overview. Medical Care 19, pp. 4–27.