糖化血红蛋白诊断糖尿病切点的横断面研究

目的 比较HbA1C在两组不同年龄人群中糖代谢异常的诊断切点和临床意义.方法 与口服葡萄糖耐量试验(OGTT)比较,在两个经糖尿病筛查(横断面资料)、不同年龄分布的人群中对HbA1C诊断2型糖尿病和糖调节受损(IGR)的切点进行分析,探讨其临床意义.结果 中青年为主的院校组(1 064人)和老年社区组(1 671人)的HbA1C均值分别为5.31%±0.41%和5.79%±0.71%.对应OGTT诊断的结果计算HbA1C诊断的尤登指数,两组HbA1C诊断糖尿病的切点分别为5.7%(特异性86.7%,敏感性66.7%)和5.9%(特异性73.8%,敏感性80.1%),诊断IGR的切点分别为5.6%(特异性82.8%,敏感性55.8%)和5.7%(特异性60.9%,敏感性64.3%).在总人群中以HbA1C 5.7%、5.9%和6.5%为切点,诊断为糖尿病的患者分别为87.8%、78.7%和38.5%,IGR为61.6%、39.6%和4.1%,正常糖耐量者24.4%、10.0%和0.4%.结论 HbA1C诊断糖尿病和IGR的切点受评估人群年龄和HbA1C水平的影响.HbA1C6.5%虽敏感性差但特异性高,需结合空腹血糖、随机血糖和OGTF作为临床诊断糖尿病标准之一.

Abstract：

Objective To compare the difference of cutpoint and clinical significance of HbA1C for the diagnosis of abnormal glucose metabolism in two population groups with different ages.Methods According to oral glucose tolerance test(OGTT),the cutpoint and clinical significance of HbA1C for the diagnosis of type 2 diabetes and impaired glucose regulation(IGR)were investigated in the two population groups.Results The mean HbA1C of 1 064 young subjects in an academy and 1 671 aged subjects in a community were 5.31% ±0.41% and 5.79% ±0.71%,respectively.The cutpoints of HbA1C for diagnosis of diabetes were 5.7%(specificity 86.7%,sensitivity 66.7%)and 5.9%(specificity 73.8%,sensitivity 80.1%)in the two population groups,and 5.6% for diagnosis of IGR (specificity 82.8%,sensitivity 55.8%)and 5.7%(specificity 60.9%,sensitivity 64.3%),respectively.87.8%,78.7%,and 38.5% were diagnosed diabetes by current OGTT criteria at HbA1C levels of ≥5.7%,≥5.9%,and≥6.5%,IGR being 61.6%,39.6%,and 4.1%,and normal glucose tolerance being 24.4%,10.0%,and 0.4%.Conclusion The cutpoints of HbA1C for diagnosis of diabetes and IGR are different in populations with different ages and HbA1C levels.As one of diagnostic criteria for diabetes,HbA1C 6.5% with relatively higher specificity and lower sensitivity must be combined with fasting blood glucose,random blood glucose,and OGTT.

Cutpoint and clinical significance of HbA1C for diabetes diagnosis in a cross-sectional study

Objective To compare the difference of cutpoint and clinical significance of HbA1C for the diagnosis of abnormal glucose metabolism in two population groups with different ages.Methods According to oral glucose tolerance test(OGTT),the cutpoint and clinical significance of HbA1C for the diagnosis of type 2 diabetes and impaired glucose regulation(IGR)were investigated in the two population groups.Results The mean HbA1C of 1 064 young subjects in an academy and 1 671 aged subjects in a community were 5.31% ±0.41% and 5.79% ±0.71%,respectively.The cutpoints of HbA1C for diagnosis of diabetes were 5.7%(specificity 86.7%,sensitivity 66.7%)and 5.9%(specificity 73.8%,sensitivity 80.1%)in the two population groups,and 5.6% for diagnosis of IGR (specificity 82.8%,sensitivity 55.8%)and 5.7%(specificity 60.9%,sensitivity 64.3%),respectively.87.8%,78.7%,and 38.5% were diagnosed diabetes by current OGTT criteria at HbA1C levels of ≥5.7%,≥5.9%,and≥6.5%,IGR being 61.6%,39.6%,and 4.1%,and normal glucose tolerance being 24.4%,10.0%,and 0.4%.Conclusion The cutpoints of HbA1C for diagnosis of diabetes and IGR are different in populations with different ages and HbA1C levels.As one of diagnostic criteria for diabetes,HbA1C 6.5% with relatively higher specificity and lower sensitivity must be combined with fasting blood glucose,random blood glucose,and OGTT.