Question

A 70-year-old man presents with muscle weakness in the proximal limbs and an elevated creatine kinase. Polymyositis is suspected. According to NICE or relevant Royal College guidelines, which investigation is key to confirming the diagnosis?

Accepted Answer

Muscle biopsy

Answer

Plain X-ray of the affected muscles

Answer

Autoantibody test for anti-centromere antibodies

Answer

Nerve conduction studies

Answer

Thyroid function tests

Practice question

A 70-year-old man presents with muscle weakness in the proximal limbs and an elevated creatine kinase. Polymyositis is suspected. According to NICE or relevant Royal College guidelines, which investigation is key to confirming the diagnosis?