3rd January 2024

A 37-year-old female presents to their GP with worsening shortness of breath and double vision

A 37-year-old female presents to their GP with worsening shortness of breath and double vision. She states her breathing has been worsening for the last 2 weeks, and her worst symptoms are at the end of the day after work. She has recently started to struggle with double vision.

Select the SINGLE most investigation which would likely confirm the diagnosis. Select ONE option only.