Muscular Dystrophy and Serum CK Activity

It is a common symptom of viral myositis

It is only elevated in Duchenne muscular dystrophy

It is highest in infancy and childhood in progressive muscular dystrophy (correct)

It is not related to any muscle diseases

Early adulthood (19-30 years of age)

Middle age (31-50 years of age)

Adolescence (11-18 years of age)

Infancy and childhood (7-10 years of age) (correct)

It is only found in female carriers of the disease

It is not significant and does not indicate the presence of the disease

It is a common symptom of the disease

50%-80% of asymptomatic female carriers show threefold to six-fold increase of CK activity (correct)