Symptoms, medical history and assessments
Parkinson’s disease is diagnosed by a neurologist based on your medical history, symptoms and movement. Brain imaging or other tests are sometimes used to support the diagnosis.
Together, these findings point to the most likely explanation for the symptoms, which then helps guide the most appropriate care, medication choices and future planning.
Assessments and investigations
Different movement conditions can look alike but often have different causes, progress differently and respond to different treatments. Below are some steps a specialist may take to diagnose an individual with suspected Parkinson's disease.
This typically includes:
- cognitive testing – structured tasks assessing memory, attention, language, visual-spatial skills and problem-solving, particularly if cognitive changes are a concern
- mental state assessment – particularly relevant if mood, behaviour or hallucinations are present
- movement examination – observing resting tremor, bradykinesia, rigidity, gait, freezing and balance, often through specific movement tasks and manoeuvres.
Tests used to help rule out other contributors and support diagnosis:
- additional imaging (in selected cases) – such as a DaTscan, which can help distinguish Parkinson's disease from some other causes of tremor or slowness
- blood tests – checking for thyroid problems, vitamin deficiencies and other treatable causes of similar symptoms
- brain imaging (MRI or CT) – looking at brain structure and ruling out other causes such as stroke or structural changes
- medication trial – in some cases, a trial of Parkinson's medication and the response to it can support the diagnosis
- other tests (in selected cases) – when the diagnosis is unclear or has specific implications.
Not everyone needs every test. The specialist selects investigations based on your individual presentation.
Understanding symptoms and medical history
The specialist may ask about:
- when symptoms started and how they have changed over time
- how symptoms affect daily life, medical history, medications, alcohol use, sleep and family history of Parkinson's disease or related conditions.
Input from a family member or someone who knows the patient well is often very helpful, as they may notice changes the individual has, particularly with non-movement symptoms.
Why ongoing review matters
Parkinson's disease can change over time and how someone responds to treatment can provide additional diagnostic information. Regular follow-ups help patients and families feel confident that care is adaptable and responsive to changing needs.
Common patient questions
Yes. As symptoms evolve, the specialist may refine the diagnosis, particularly in the early stages when features can overlap with other movement disorders.
No. Testing is tailored to your individual symptoms and history. Not all tests are necessary for every person and Parkinson's disease is often diagnosed on clinical grounds alone.
Depending on your needs, this may include a neuropsychologist (for detailed cognitive testing), a GP, and allied health professionals such as physiotherapists, occupational therapists or speech pathologists.