This erratum is being published to correct the printing and nomenclature errors of the article entitled 'Heterogeneous Spectrum of CFTR Gene Mutations in Korean Patients with Cystic Fibrosis' by Haiyoung Jung, Chang-Seok Ki, Won-Jung Koh, Kang-Mo Ahn, Sang-Il Lee, Jeong-Ho Kim, Jae Sung Ko, Jeong Kee Seo, Seung-Ick Cha, Eun-Sil Lee, Jong-Won Kim in Korean J Lab Med 2011;31:219-224, DOI 10.3343/kjlm.2011.31.3.219 as follows. The GenBank accession number of the CFTR gene should be read NM_000492.3. In addition, nomenclatures of three mutations should be corrected as follows: p.K684NfsX38 rather than p. L728NfsX38 (case 1), c.2089dupA rather than c.2089_2090insA (case 8), and c.1322T>C rather than c.1454T>C (case 9). Therefore, all mutation nomenclatures in the text and Table 2 should be corrected accordingly.