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Delayed motor milestones / CK screening

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Teaching point — how the wording changes the answer

A 1-year-old with delayed walking and a similarly affected mother raises concern for a hereditary myopathy/muscular dystrophy; the best initial screening test for progressive muscle weakness or delayed motor milestones is creatine kinase (CK).

Q40 1-year-old with delayed walking and flat foot; mother similarly affected. Best test?
Key clue Screen for myopathy with CK before EMG/biopsy
Show answer
Creatine kinase (CK)