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Diagnosis

Home / Diagnosis

Information about obtaining a diagnosis

Getting a formal diagnosis of FSHD by a doctor is an important step. The diagnosis will enable you to obtain FSHD-specific medical care and plan better for your future. If you know for certain that you have FSHD, which is a hereditary condition, you can seek genetic counseling to help guide decisions about having children and also whether other family members might be affected. A doctor's diagnosis is also required if you wish to participate in research and clinical trials of new treatments. Before getting a diagnosis, you should also consider the potential impact on long-term care insurance, life insurance, etc., and plan accordingly.

The first step in diagnosing FSHD is a visit with a doctor for a physical exam. An initial diagnosis is based on the pattern of muscles affected. The doctor will ask a series of questions about the patient’s family history and medical history (see Symptoms).

The doctor may order tests to determine whether the problems are a result of FSHD. Tests may also rule out other problems that could cause muscle weakness, such as surgery, toxic exposure, medications, or other diseases. These tests may include the following:

  • Blood tests to measure levels of serum creatine kinase (CK), an enzyme that is released into the bloodstream when muscle fibers are deteriorating, and serum aldolase, an enzyme that helps break down sugars into energy. Elevated levels of either of these enzymes can indicate a problem with muscles and a need for additional testing. However, a normal CK level does not rule out FSHD.
  • Neurological tests to rule out other nervous system disorders, identify patterns of muscle weakness and wasting, test reflexes and coordination, and detect muscle contractures.
  • Muscle biopsies, which involve the removal of muscle tissue using a biopsy needle or during a simple surgical procedure. The tissue is then examined under a microscope. In FSHD, a muscle biopsy might reveal several abnormalities, but none are uniquely characteristic for the disease, or the muscle might even appear normal. To confirm a diagnosis of FSHD with certainty, a genetic test is needed.
  • Genetic testing to confirm FSHD Type 1 or Type 2.

Adapted from NIH Health Topics.

Additional information:

  • Download our brochure About FSHD (Download in Spanish)
  • Download our Physical Therapy for FSHD brochure
  • Genetic testing
  • Early Onset FSHD

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