Immunoblot analysis of CFTR glycoforms in patients’ specimens is technically challenging and has yet been applied to only a few common CFTR genotypes causing typical full‐blown CF (Kälin et al., 1999; Kartner, Augustinas, Jensen, Naismith, & Riordan, 1992; van Barneveld et al., 2010). This evidence concerns the gene CFTR and cystic fibrosis.