How many geriatricians should, at minimum, be staffing health regions in Australia?

In any particular region, determining an adequate, quantifiable geriatrician full-time equivalent required to run geriatric medicine services comprehensively - that is spanning both inpatient and outpatient settings - remains an imperfect science. Whilst workforce planning may be addressed through 'demand versus supply' simulations, 'specialist-to-patient ratios' (SPRs) may be a useful additional workforce metric. There has never been a yardstick SPR, which 'defines' a satisfactory level of geriatrician manpower in any particular Australian hospital catchment. Here, a new methodology is proposed (tailored specifically to Australian geriatrics), illustrating how we may begin to transparently deduce such a national benchmark SPR. Allowing for some empiricism, the method presently favours an SPR approximating '0.4 full-time equivalent of geriatrician time per 10 000 head of population' in regions with 'average' population age distribution; this level of manpower may afford specialist assessment of targeted patients (widely capturing geriatric cases from acute to community settings). Further discussion on workforce planning methodologies is warranted.