The diagnosis is 1. Often have a family history. X chromosome 2. The diseased muscles first involved the proximal limb muscles, with pseudohypertrophy on both sides, weakness of lower limbs, gait swing and positive Goyle sign; It is difficult to lift the arm of the upper limb.
3. Normal skin perception, no tendon reflex and hyperreflexia, no muscle tremor.
4. The significant increase of blood CPK is the most sensitive index, which is helpful for early diagnosis; Alanine aminotransferase, aspartate aminotransferase and lactate dehydrogenase can be increased.
5. EMG is consistent with muscle thickness injury; Muscle biopsy revealed fibrosis; Dystrophin content determination and PCR technology are helpful for diagnosis.
I suggest you have a diagnosis once a year. It's hard to say when the pathogenic gene works, but the incidence of this disease is higher in men than in women, so your brother should be more dangerous than you. In fact, it is good to go to a big hospital for a chromosome examination.