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The symptoms can be difficult to assess, particularly in the elderly. They become clearer as the illness gets worse. Your health care provider may be able to diagnose Parkinson’s disease based on your symptoms and a physical examination.
A doctor’s examination may show:
Reflexes should be normal.
Tests may be needed to rule out other disorders that cause similar symptoms.
Parkinson’s disease can be difficult to diagnose in its early stages. Doctors base their diagnosis on the patient’s medical history and symptoms evaluated during a neurological exam. No laboratory or imaging tests can diagnose Parkinson’s, although brain scans such as computed tomography (CT), magnetic resonance imaging (MRI), or positron-emission tomographic (PET) may be used to rule out other neurological disorders.
A medical and personal history should include any relevant symptoms as well as any medications taken, and information on other conditions the patient may have.
In a neurological exam, the doctor will ask the patient to sit, stand, walk, and extend arms. The doctor will observe the patient’s balance and coordination. Parkinson’s may be suspected in patients who have at least two of the following four symptoms, especially if they are more obvious on one side of the body:
A levodopa challenge test may confirm a diagnosis of Parkinson’s disease. If a patient’s symptoms improve when they take levodopa, they likely have Parkinson’s, ruling out other neurological diseases.