The goal of the Healey ALS MyMatch Common Screening Protocol (MCSP), an observational study, is to identify individuals with ALS who may be eligible to be matched to a currently enrolling ALS MyMatch trial. Participants will complete a MCSP Screening Visit and undergo clinical assessments, laboratory testing, and biomarker analyses to determine preliminary trial eligibility. The study also characterizes clinical, genetic, and biofluid biomarker profiles, assesses the prevalence of ALS-associated gene variants, and banks blood samples for future ALS and biomarker research. MCSP enables simultaneous screening for multiple trial-specific biomarkers and uses a targeted medical history form to optimize matching of participants to appropriate MyMatch trials.