We conducted a multicentre prospective study comparing radioimmunoprecipitation assay (RIPA), enzyme‐linked immunosorbent assay (ELISA) and fixed cell‐based assay (F‐CBA) for anti‐AChR and anti‐MuSK antibody detection in 78 patients with suspected MG with at least 6 months of clinical follow‐up. Here, MUSK is linked to myasthenia gravis.