Russian test systems, like “IMMUNO-BIT” (for quantitative detection of TREC and KREC DNA in children up to 18 years of age) and “TK-SMA”, with an additional channel for qualitative detection of SMN1 gene deletion associated with spinal muscular atrophy (used as part of extended neonatal screening) have been developed and registered in Russia. Here, SMN1 is linked to spinal muscular atrophy.