David Hadorn's analysis1 fails to distinguish between waiting lists for diagnostic procedures (such as MRI) and those for therapeutic procedures. Diagnostic information is often required to confirm the presence of disease and assess its severity, and only when this information becomes available can the patient be appropriately queued for treatment. Long wait times for diagnostic tests are counterproductive and costly, both to the patient in terms of morbidity and disease progression and to the medicare system in terms of wasteful use of “second best” tests. A six-month wait for an MRI to confirm suspected multiple sclerosis is no more reasonable than a similar wait for a blood test to confirm suspected anemia. The Western Canada Waiting List project failed to statistically validate its MRI prioritization tool and has not endorsed it for general use. MRI prioritization does not work well simply because the severity of disease (and therefore the urgency of the test) is not accurately known until the test is done. The only practical and ethical way to address MRI wait lists is to provide adequate capacity for demand. The Alberta Imaging Advisory Committee pegged that capacity at 62 exams/1000 people/ year.2 Alberta is the only province to approach that capacity. Sadly, Ontario, which maintains an absolute statutory monopoly over MRI services, provides for only half the needed capacity.