Why isn’t the EMG repeated at every examination?

An EMG is used to make a diagnosis—in conjunction with the physical symptoms of ALS. An EMG examination should only be repeated if the clinical diagnosis of ALS is still uncertain and the EMG is used to distinguish ALS from other motor disorders (e.g., muscle diseases). However, repeat EMG examinations are rarely performed, as the procedure is perceived as burdensome and, at the same time, does not provide any prognostic information regarding the course of ALS. Biomarkers (e.g. , neurofilament light chain, NfL) in blood serum andcerebrospinal fluid (CSF) are methodologically better suited for assessing the prognosis.