Together, the results of this study show that multiplex ALBIA-NAM allows efficient detection and quantification of anti-HMGCR or anti-SRP aAbs in patients with suspicion of NAM and that the diagnosis of anti-HMGCR positive NAM should not be excluded a priori in patients who have not been exposed to statins. Here, STAC3 is linked to Bailey-Bloch congenital myopathy.