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Tests and diagnosis
By Mayo Clinic staff
No single test can identify frontotemporal dementia, so doctors attempt to identify certain characteristic features while excluding other possible causes.
Blood tests
To see if your symptoms are being caused by some systemic illness, your doctor may order blood work to check your:
- Complete blood count
- Electrolytes, such as sodium and potassium levels
- Liver function
- Kidney function
- Thyroid function
Neuropsychological testing
Sometimes doctors undertake a more extensive assessment of reasoning and memory skills. This type of testing, which can take several hours to complete, is especially helpful in trying to differentiate between the different types of dementia at an early stage.
Brain scans
By looking at images of the brain, doctors may be able to pinpoint any visible abnormalities — such as clots, bleeding or tumors — that may be causing signs and symptoms.
- Magnetic resonance imaging (MRI). An MRI machine uses radio waves and a strong magnetic field to produce detailed images of your brain. You lie on a narrow table that slides into the tube-shaped MRI machine, which makes loud banging noises during scans. The entire procedure can take an hour or more. MRIs are painless, but some people feel claustrophobic in the machine.
- Computerized tomography (CT). For a brain CT scan, you lie on a narrow table that slides into a small chamber. X-rays pass through your head from various angles, and a computer uses this information to create cross-sectional images, or slices, of your brain. The test is painless and takes about 20 minutes.
- Knopman DS. Alzheimer's disease and other dementias. In: Goldman L, et al. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007. http://www.mdconsult.com/das/book/body/109993418-3/771185545/1492/1426.html#4-u1.0-B978-1-4160-2805-5..50430-4--cesec84_18054. Accessed Nov. 12, 2008.
- Shadlen MF, et al. Dementia syndromes. http://www.uptodate.com/home/index.html. Accessed Nov. 12, 2008.
- NINDS frontotemporal dementia information page. National Institute of Neurological Disorders and Stroke. http://www.ninds.nih.gov/disorders/picks/picks.htm. Accessed Nov. 12, 2008.
- Josephs KA. Frontotemporal lobar degeneration. Neurologic Clinics. 2007;25:683.
- Petersen R. Mayo Clinic Guide to Alzheimer's Disease. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2006:115.
- Shadlen MF, et al. Evaluation of cognitive impairment and dementia. http://www.uptodate.com/home/index.html. Accessed Nov. 12, 2008.
- Neurological diagnostic tests and procedures. National Institute of Neurological Disorders and Stroke. http://www.ninds.nih.gov/disorders/misc/diagnostic_tests.htm. Accessed Nov. 12, 2008.
- Press D, et al. Treatment of behavioral symptoms related to dementia. http://www.uptodate.com/home/index.html. Accessed Nov. 13, 2008.
