Yes. If you are in Australia temporarily you can approach an office of the Department of Immigration and Multicultural and Indigenous Affairs to collect the medical forms (Form 26 and Form 160) and details on approved doctors and radiologists. You should sent your sealed medical results, marked with your file reference, to this office or to DIAC directly when completed.
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If you have completed a health examination in the last twelve months you may not need to undertake a fresh examination if the visa processing office can confirm the details, substance and date of the earlier reports.