这个eHealth讲的很清楚 http://www.immi.gov.au/gateways/panel_doctors/_pdf/ehealth.pdf
When visa applicants visit a clinic using eHealth, the clinic will:
take their digital photo and upload it to eHealth
enter all examination results (including a digital chest x-ray if required) into eHealth. Health examination and x-ray results will be instantly available to the department’s health operations centre for assessment, and in most cases, finalised within 48 hours.