Table 2 shows our SMN2 copy number findings for the 9 SMA-affected infants who were identified by newborn screening compared to results obtained from diagnostic testing using digital droplet PCR. Results from six of the infants matched, including one who we reported as “at least three copies” and diagnostic testing reported four copies. For the other three infants, our results showed three copies of SMN2 while the results of diagnostic testing showed only two copies. Here, SMN2 is linked to proximal spinal muscular atrophy.