title: The Role of Haemoglobin A1c in Screening Obese Children and Adolescents for Glucose Intolerance and Type 2 Diabetes.
abstract: BACKGROUND
  In 2012, an international expert committee in diabetes wrote in favor of screening adult and paediatric patients for glucose intolerance and type 2 diabetes using glycated haemoglobin. The aim of this study was to evaluate glycated haemoglobin utility as a screening tool in a young obese mainly Caucasian population.
  
  
  METHODS
  Children [(n = 266), body mass index z-score 3.35 ± 0.59, 90% Caucasian 90%, 55% female, median age 12.3 (range: 8.9 - 17.6) years old] recently referred to a tertiary hospital-based obesity clinic underwent a routine oral glicose tolerance test and glycated haemoglobin measurement.
  
  
  METHODS
  abnormal forms of haemoglobin and conditions linked to increased erythrocyte turnover.
  
  
  RESULTS
  The oral glicose tolerance test diagnosed 13 (4.9%) subjects as prediabetic but none as diabetic. According to glycated haemoglobin, 32 would be prediabetic (29 false positives) and one would be diabetic (when he was only glucose intolerant). On the other hand, 10 prediabetic patients would not have been identified (false negatives). Glycated haemoglobin receiver operator characteristic analysis area under the curve was 0.59 (CI 95% 0.40 - 0.78), confirming its reduced capacity to identify prediabetes. Better results were achieved when calculating receiver operator characteristic analysis area under the curve for fasting glucose (0.76;CI 95% 0.66 - 0.87), homeostasis model assessment for insulin resistance (0.77; CI 95% 0.64 - 0.90) and triglycerides:HDL cholesterol ratio (0.81; CI 95% 0.66 - 0.96).
  
  
  CONCLUSIONS
  In Paediatric populations, especially when mainly Caucasian, glycated haemoglobin does not seem to be a useful screening tool for prediabetes.
  
  
  CONCLUSIONS
  For this reason, it would appear premature to advise it as a diagnostic tool until significantly more data is available. Homeostasis model assessment for insulin resistance and triglycerides: HDL cholesterol have higher precision and can be calculated using a fasting blood sample.
authors.affiliation: Unidade de Endocrinologia Pediátrica e Diabetes. Hospital de Dona Estefânia. Centro Hospitalar de Lisboa Central. Lisboa. Portugal. Department of Clinical Sciences. Institute of Child Life & Health. University of Bristol. Bristol. Reino Unido.
authors.forename: Júlia
authors.initials: J
authors.lastname: Galhardo
authors.affiliation: Department of Clinical Sciences. Institute of Child Life & Health. University of Bristol. Bristol. Reino Unido. Paediatric Endocrinology, Diabetes and Metabolism Unit. Bristol Royal Hospital for Children. University Hospitals Bristol â NHS Foundation Trust. Bristol. Reino Unido.
authors.forename: Julian
authors.initials: J
authors.lastname: Shield
mesh_terms: D000293:Adolescent; D002648:Child; D003430:Cross-Sectional Studies; D003924:Diabetes Mellitus, Type 2 / Q000097:blood* / Q000175:diagnosis*; D005260:Female; D018149:Glucose Intolerance / Q000097:blood* / Q000175:diagnosis*; D006442:Glycated Hemoglobin / Q000032:analysis*; D006801:Humans; D008297:Male; D008403:Mass Screening; D063766:Pediatric Obesity / Q000097:blood* / Q000150:complications; D011236:Prediabetic State / Q000097:blood* / Q000175:diagnosis*
chemical_list: D006442:Glycated Hemoglobin