The list of medical tests mentioned in various sources as used in the diagnosis of Usher Syndrome includes:
Since individuals with Usher syndrome have both hearing and visual symptoms, we perform testing of both systems. This testing includes:
Although some of the genes that cause Usher syndrome have been described, the diagnosis is still based on clinical testing. (Source: excerpt from Usher Syndrome Resource Guide: NEI)
At this time, genetic testing for Usher syndrome is done only as part of research projects. This is due to many factors. Usher syndrome is not caused by only one gene. So far, 10 Usher genes have been mapped: 7 for type I, 3 for type II, and 1 for type 3. There are still more genes to find. A few of these genes have been sequenced and described. These are MYO7A, harmonin, CDH23, PCDH15, all causing type I; and usherin, causing type II. (Source: excerpt from Usher Syndrome Resource Guide: NEI)
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A detailed family history may imply predisposition to retinitis pigmentosa. In the patient whose history suggests this condition, the following tests help confirm diagnosis.
❑ Electroretinography shows a slower than normal or absent retinal response time.
❑ Fluorescein angiography visualizes white dots (areas of dyspigmentation) in the epithelium.
❑ Ophthalmoscopy may initially show normal fundi but later shows black pigmentary disturbance and white dots (dyspigmentation) in the epithelium.
❑ Visual field testing (using a tangent screen) detects ring scotomata.
Source: Professional Guide to Diseases (Eighth Edition), 2005
Because the patient isn’t generally able to recognize a lid lag himself, ask a friend or family member if he has noticed it. If so, ask when he first noticed lid lag or its possible manifestation, incomplete closure of the eyelid. Explore other signs and symptoms, and ask about a history of thyroid disease. Next, perform a physical examination, focusing on the effects of thyrotoxicosis, such as an enlarged thyroid, diaphoresis, tremors, and exophthalmos.
Source: Professional Guide to Signs & Symptoms (Fifth Edition), 2006
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