What is a common diagnostic test used to evaluate Myasthenia Gravis?

Electromyography (EMG) is a key diagnostic tool used to evaluate Myasthenia Gravis. This autoimmune disorder is characterized by weakness and fatigability of voluntary muscles due to a defect in the transmission of nerve impulses to muscles at the neuromuscular junction. EMG helps assess the electrical activity of muscles and can demonstrate abnormalities in neuromuscular transmission, specifically a decremental response to repetitive stimulation, which is indicative of Myasthenia Gravis.

In addition, Edrophonium (Tensilon) testing can also be performed, which temporarily improves muscle strength in patients with Myasthenia Gravis, further supporting the diagnosis. Together with clinical features and serological tests for antibodies against acetylcholine receptors, these diagnostic approaches help confirm the condition.

The other options provided do not serve as common diagnostic tests for Myasthenia Gravis. A CT scan of the abdomen, while useful in other contexts, does not directly evaluate neuromuscular transmission. Blood glucose levels are pertinent for metabolic evaluation rather than neuromuscular conditions. An X-ray of the chest could be considered for detecting thymic hypertrophy or thymomas, which are associated with Myasthenia Gravis, but it is not a first