title: Strongest correlation of HbA(1c) with 1-month-earlier glucose levels in type 2 diabetes.
abstract: We examined the correlations of hemoglobin A(1c) (HbA(1c)) with each plasma glucose (PG) level obtained at 0 (the same day), 1 and 2 month(s) prior to HbA(1c) determination. Data were from glycemic profiles of four patients of type 2 diabetes mellitus treated with tablets whose HbA(1c) and pre- and post-breakfast PG levels were monitored each month. There was no significant difference in the correlation coefficients in cases 1 and 2, who presented with linear glycemic time courses. In contrast, HbA(1c) correlated with 1-month-earlier pre-breakfast PG level more strongly than 2-month-earlier post-breakfast PG level in cases 3 and 4, and than same-day post-breakfast PG level in case 3 (P<0.05, ANOVA). The cases 3 and 4 presented with fluctuating glycemic time courses. Samples were separated into upslope's and downslope's sections according to HbA(1c) fluctuation in the latter two cases. Reflecting around the 1-month lag between HbA(1c) and PG, the two sections' regression lines for PG versus HbA(1c) corresponded in the only samples related to 1-month-earlier pre- and post-breakfast PG (t-test). In conclusion, it appears that pre- and post-breakfast PG levels are the most reliable predictors of 1-month-later HbA(1c) in type 2 diabetic outpatients who undergo medical examinations every month.
authors.affiliation: First Department of Internal Medicine, Faculty of Medicine, Kagoshima University, 8-35-1 Sakuragaoka, 890-8520 Kagoshima, Japan. nakazaki@m2.kufm.kagoshima-u.ac.jp
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Nakazaki
authors.forename: Eriko
authors.initials: E
authors.lastname: Fukushige
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Koriyama
authors.forename: Michiyo
authors.initials: M
authors.lastname: Fukudome
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Hashiguchi
authors.forename: Katsumi
authors.initials: K
authors.lastname: Aso
authors.forename: Junko
authors.initials: J
authors.lastname: Yano
authors.forename: Yuko
authors.initials: Y
authors.lastname: Ikeda
authors.forename: Kaori
authors.initials: K
authors.lastname: Kato
authors.forename: Chuwa
authors.initials: C
authors.lastname: Tei
mesh_terms: D000328:Adult; D000368:Aged; D001786:Blood Glucose / Q000032:analysis*; D003924:Diabetes Mellitus, Type 2 / Q000097:blood*; D005215:Fasting; D005260:Female; D006442:Glycated Hemoglobin / Q000032:analysis*; D006801:Humans; D007700:Kinetics; D008297:Male; D012044:Regression Analysis; D013997:Time Factors
chemical_list: D001786:Blood Glucose; D006442:Glycated Hemoglobin