The consensus definition of CSPID is an asymptomatic infant with an abnormal CF-NBS result and (a) SC < 30 mmol/L and two CFTR gene variants, of which at least one is a VVCC or (b) SC ≥ 30–59 mmol/L and one or no CFc variants [5]. Here, CFTR is linked to cystic fibrosis.