This test is rarely indicated. Muscle MRI is sensitive for detecting muscle damage, even in mild cases. Because of the particular muscle involvement patterns of FSHD, MRI can help differentiate FSHD from other muscle diseases, directing genetic testing. Differential diagnosis
Included in the differential diagnosis of FSHD are limb-girdle muscular dystrophy (especially calpainopathy), scapuloperoneal myopathy, mitochondrial myopathy, Pompe disease, and polymyositis. Calpainopathy and scapuloperoneal myopathy, like FSHD, present with scapular winging. Features that suggest FSHD are facial weakness, asymmetric weakness, and lack of benefit from immunosuppression medications. Features the suggest an alternative diagnosis are contractures, respiratory insufficiency, weakness of muscles controlling eye movement, and weakness of the tongue or throat. Management
No intervention has proven to significantly slow progression of weakness or improve strength. Screening and monitoring of complications
The American Academy of Neurology (AAN) recommends several medical tests to detect complications of FSHD. A dilated eye exam to look for retinal abnormalities is recommended in those newly diagnosed with FSHD; for those with large D4Z4 deletions, an evaluation by a retinal specialist is recommended yearly. A hearing test is recommended for individuals with early-onset FSHD prior to starting school, or for any other FSHD-affected individual with symptoms of hearing loss. Pulmonary function testing (PFT) is recommended in those newly diagnosed to establish baseline pulmonary function, and recurrently for those with pulmonary insufficiency symptoms or risks. Routine screening for heart conditions, such as through an electrocardiogram (EKG) or echocardiogram (echo), is considered unnecessary in those without symptoms of heart disease.
Dissociation, in the wide sense of the word, is an act of disuniting or separating a complex object into parts. Dissociation may also refer to:

Dissociation (chemistry), general process in which molecules or ionic compounds (complexes, or salts) split into smaller particles, usually in a reversible manner
Dissociation (neuropsychology), identification of the neural substrate of a particular brain function through various methods
Dissociation (psychology), an experience of having ones attention and emotions detached from the environment
Dissociation (rhetoric), a rhetorical device in which the speaker separates a notion considered to form a unitary concept into two new notions to affect an audience in some way
Dissociation (album), by the Dillinger Escape Plan, 2016

See also
Dissociation: Progress in the Dissociative Disorders (1988-1997) published by International Society for the Study of Trauma and Dissociation
"Disassociation", a 2021 song by the Rions
Dissociative, a class of hallucinogen
All pages with titles beginning with Dissociation
All pages with titles containing Dissociation