Diabetes & Metabolism Journal

Original Articles

Type 1 Diabetes
Familial Occurrence of Type 1 Diabetes Mellitus in Korean Children and Adolescents: A Multicenter Study: Hae Sang Lee, Hwa Young Kim, Mi Yang, Yun Jeong Kim, Hyun Wook Chae, Kyungchul Song, Aram Yang, Hyo-Kyoung Nam, Young-Jun Rhie, Eungu Kang, Mo Kyung Jung, Yoonha Lee, Sung Yoon Cho, Insung Kim, Minji Im, Moon Bae Ahn, Su Jin Park, Soo Yeun Sim, Yoo-Mi Kim, Young-Lim Shin, Yong Hee Hong, Junghwan Suh, Sujin Kim, Seo Jung Kim, Min Hyung Cho, Yong Hyuk Kim, Jieun Lee, Su Jin Kim, Jisun Park, Eun Young Joo, Myung Ji Yoo, Minsun Kim, Han Sol Kim, Han Hyuk Lim, Jung Eun Moon, Kyungmi Jang, Chan Jong Kim, Jaehyun Kim; Received November 13, 2025 Accepted January 23, 2026 Published online March 5, 2026; DOI: https://doi.org/10.4093/dmj.2025.1149 [Epub ahead of print]

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Abstract PDF Supplementary Material PubReader ePub: Background
Data on the familial occurrence of type 1 diabetes mellitus (T1DM) in Korean pediatric populations are limited. This study evaluated the clinical characteristics of children with T1DM according to family history and estimated the T1DM prevalence among relatives.
Methods
We conducted a multicenter retrospective cohort study including patients aged ≤18 years newly diagnosed with T1DM at 18 university-affiliated hospitals in Korea between 2010 and 2024. The index child was defined as the first sibling diagnosed with T1DM and categorized according to the presence of affected parents or siblings. Familial T1DM prevalence was calculated for siblings, first-degree relatives, and twin pairs.
Results
Among 936 index children, 32 (3.4%) exhibited a T1DM family history. Compared with index children, subsequent-affected children presented with lower plasma glucose (300.0 mg/dL vs. 412.0 mg/dL, P=0.009) and glycosylated hemoglobin levels (10.4% vs. 12.6%, P<0.001), and a lower frequency of diabetic ketoacidosis (13.8% vs. 49.7%, P<0.001). Venous pH and serum bicarbonate levels were higher (7.4 vs. 7.3, P=0.005; 22.0 mmol/L vs. 17.0 mmol/L, P=0.004, respectively), whereas urine ketone levels were significantly lower (P<0.001). Sibling, first-degree relative, and twin-pair prevalence rates were 3.0% (23/779), 1.3% (34/2,651), and 42.9% (3/7), respectively.
Conclusion
In this multicenter Korean cohort, familial T1DM accounted for 3.4% of pediatric cases, which was lower than in Western populations. Subsequent-affected children exhibited milder metabolic decompensation at diagnosis than did index children, likely reflecting earlier recognition through family awareness and screening. These findings underscore the importance of early education and monitoring of at-risk relatives within affected families.

Guideline/Statement/Fact Sheet
2025 Clinical Practice Guidelines for Diabetes Management in Korea: Recommendation of the Korean Diabetes Association: Shinae Kang, Seon Mee Kang, Jong Han Choi, Seung-Hyun Ko, Bo Kyung Koo, Hyuk-Sang Kwon, Mi Kyung Kim, Sang Yong Kim, Soo-Kyung Kim, Young-eun Kim, Eun Sook Kim, Jae Hyeon Kim, Chong Hwa Kim, Ji Min Kim, Hae Jin Kim, Min Kyong Moon, Sun Joon Moon, Jun Sung Moon, Joon Ho Moon, Se Hee Min, Jung Hwan Park, Jaehyun Bae, Keeho Song, Ji Yoon Ahn, Jae-Seung Yun, Woo Je Lee, You-Bin Lee, Suk Chon, Eonju Jeon, Sang-Man Jin, Eugene Han, You-Cheol Hwang, Jae Hyun Bae, YoonJu Song, Jeong Hyun Lim, Jae Won Cho, Ji Yeon Choi, Yong Hee Hong, Jieun Lee, Sung Eun Kim, Ji Yun Noh, Bong-Soo Cha, Byung-Wan Lee; Diabetes Metab J. 2025;49(4):582-783. Published online July 1, 2025; DOI: https://doi.org/10.4093/dmj.2025.0469

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Epidemiology
Discrepancies between Glycosylated Hemoglobin and Fasting Plasma Glucose for Diagnosing Impaired Fasting Glucose and Diabetes Mellitus in Korean Youth and Young Adults: Jieun Lee, Young Ah Lee, Jae Hyun Kim, Seong Yong Lee, Choong Ho Shin, Sei Won Yang; Diabetes Metab J. 2019;43(2):174-182. Published online November 2, 2018; DOI: https://doi.org/10.4093/dmj.2018.0046

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Background

Glycosylated hemoglobin (HbA1c) has been recommended as a diagnostic test for prediabetes and diabetes. Here, we evaluated the level of agreement between diagnoses based on fasting plasma glucose (FPG) versus HbA1c levels and determined optimal HbA1c cutoff values for these diseases in youth and young adults.

Methods

The study included 7,332 subjects (n=4,129, aged 10 to 19 years in youth group; and n=3,203 aged 20 to 29 years in young adult group) from the 2011 to 2016 Korea National Health and Nutrition Examination Survey. Prediabetes and diabetes were defined as 100 to 125 mg/dL (impaired fasting glucose [IFG]) and ≥126 mg/dL for FPG (diabetes mellitus [DM] by FPG [DM_FPG]), and 5.7% to 6.4% and ≥6.5% for HbA1c, respectively.

Results

In the youth group, 32.5% with IFG had an HbA1c level of 5.7% to 6.4%, and 72.2% with DM_FPG had an HbA1c ≥6.5%. In the young adult group, 27.5% with IFG had an HbA1c level of 5.7% to 6.4%, and 66.6% with DM_FPG had an HbA1c ≥6.5%. Kappa coefficients for agreement between the FPG and HbA1c results were 0.12 for the youth group and 0.19 for the young adult group. In receiver operating characteristic curve analysis, the optimal HbA1c cutoff for IFG and DM_FPG were 5.6% and 5.9% in youths and 5.5% and 5.8% in young adults, respectively.

Conclusion

Usefulness of HbA1c for diagnosis of IFG and DM_FPG in Koreans aged <30 years remains to be determined due to discrepancies between the results of glucose- and HbA1c-based tests. Additional testing might be warranted at lower HbA1c levels to detect IFG and DM_FPG in this age group.

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