And then she had to make several phone calls to her insurance company to argue over payment for a new screening tool called computer-assisted diagnosis, in which a computer looks for abnormalities on a breast X-ray.

The "probabilities" at issue are epistemic rather than ontological in that they are imaginative parameters in the mind of the diagnostician (or, for computerized or computer-assisted diagnosis, the software of the system), while in reality the target (such as a patient) either has a condition or not with an actual probability of either 0 or 100%.