Reliable diagnosis of individuals with signs or symptoms that is suggestive of DC required very short telomeres and/or a pathogenic variant of DC‐related genes (such as TERT (MIM 187270), ACD, CTC1, DKC1, NHP2, NOP10, PARN, RTEL1, TERC, TINF2, and WRAP53) (Savage, 2018). This evidence concerns the gene TERT and dyskeratosis congenita.