Who can make decisions about an older person’s medical treatment?
This depends on whether the older person has decision-making capacity.
Everyone is presumed to have capacity unless there is evidence that they do not. A person with capacity can make their own medical treatment decisions. They can consent to or refuse medical treatment, even if treatment is needed to keep them alive.
If an older person does not have capacity, they may have made an Advance Care Directive that gives directions about treatment, or a substitute decision-maker may decide.
Paid carers, residential care homes, and health professionals cannot consent to medical treatment for older people (though there is an exception in South Australia).
When will an older person have decision-making capacity to make their own treatment decisions?
An older person will have capacity to make medical treatment decisions if they can:
- comprehend and retain the information needed to make the decision, including the consequences of the decision, and
- use and weigh that information as part of their decision-making process.
Each State and Territory has its own ‘legal test’ for health professionals to apply to decide whether an older person has decision-making capacity.
Who decides if an older person has capacity to make their own treatment decisions?
A doctor or other health practitioner (e.g. psychologist) with relevant expertise can assess whether an older person has decision-making capacity. If there is a dispute about an older person’s capacity, a court or tribunal may be able to decide. Legal advice should be sought before making an application for a court or tribunal to decide capacity.
Can an older person have capacity for some decisions but not others?
Yes. An older person might have capacity to make some decisions but not others, depending on the decision. For example, an older person may have capacity to make simple decisions e.g. whether to have paracetamol for pain relief, but not more significant decisions e.g. whether to have knee surgery. An older person’s capacity to decide must therefore be considered every time a decision is needed.
Can an older person have capacity at some times but not others?
Yes. An older person may have fluctuating capacity, meaning they may have capacity at certain times but not others. This is common in older people with dementia or mental illness. Or, an older person might temporarily lose capacity due to a medical condition e.g. a UTI causing delirium, or being unconscious.
A person’s capacity must therefore be judged at the time a treatment decision is required.
Can an older person with dementia make their own medical treatment decisions?
Yes, so long as they have decision-making capacity. Having dementia, or another impairment, condition, illness or injury, does not mean that a person lacks capacity to make medical treatment decisions. An older person with dementia is presumed to have decision-making capacity unless it can be shown that they do not. The test for whether a person with dementia has capacity is the same as for everyone else (see When will an older person have decision-making capacity? above).
If it is not possible for an older person with dementia to decide independently, they may still be able to decide with appropriate support (supported decision-making).
Can an older person make a treatment decision that their health professional or family disagrees with?
Yes. An older person with decision-making capacity has the right to make any decision they wish. Their decision must be respected, even if others do not agree, or it may result in death e.g. refusing life-saving medical treatment such as CPR. Respecting the older person’s decision supports their dignity of risk. Refusal of treatment should be clearly documented in the older person’s records.
Can an older person refuse to eat and drink?
Yes. An older person with decision-making capacity has the right to choose not to eat or drink or to be artificially fed or hydrated. Respecting an older person’s choice supports their dignity of risk. Supporting a person who chooses not to eat or drink is not voluntary assisted dying.
Even if the person does not have decision-making capacity, they may still be able to indicate their preferences about eating and drinking, or be supported to make decisions about this. These preferences should be respected.
If an older person does not have capacity, should they still be involved in decision-making?
Yes. All older people have the right to participate in decisions about their treatment, including people with dementia and other cognitive impairment. Even if an older person does not have capacity, they should be supported to participate in decision-making. In some cases, an older person may still be able to make decisions with appropriate support.
Learn more about supported decision-making: