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Translating the A1C Assay Into Estimated Average Glucose Values
OBJECTIVE: The A1C assay, expressed as the percent of hemoglobin that is glycated, measures chronic glycemia and is widely used to judge the adequacy of diabetes treatment and adjust therapy. Day-to-day management is guided by self-monitoring of capillary glucose concentrations (milligrams per decil...
Autores principales: | , , , , , |
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Formato: | Texto |
Lenguaje: | English |
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American Diabetes Association
2008
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2742903/ https://www.ncbi.nlm.nih.gov/pubmed/18540046 http://dx.doi.org/10.2337/dc08-0545 |
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author | Nathan, David M. Kuenen, Judith Borg, Rikke Zheng, Hui Schoenfeld, David Heine, Robert J. |
author_facet | Nathan, David M. Kuenen, Judith Borg, Rikke Zheng, Hui Schoenfeld, David Heine, Robert J. |
author_sort | Nathan, David M. |
collection | PubMed |
description | OBJECTIVE: The A1C assay, expressed as the percent of hemoglobin that is glycated, measures chronic glycemia and is widely used to judge the adequacy of diabetes treatment and adjust therapy. Day-to-day management is guided by self-monitoring of capillary glucose concentrations (milligrams per deciliter or millimoles per liter). We sought to define the mathematical relationship between A1C and average glucose (AG) levels and determine whether A1C could be expressed and reported as AG in the same units as used in self-monitoring. RESEARCH DESIGN AND METHODS: A total of 507 subjects, including 268 patients with type 1 diabetes, 159 with type 2 diabetes, and 80 nondiabetic subjects from 10 international centers, was included in the analyses. A1C levels obtained at the end of 3 months and measured in a central laboratory were compared with the AG levels during the previous 3 months. AG was calculated by combining weighted results from at least 2 days of continuous glucose monitoring performed four times, with seven-point daily self-monitoring of capillary (fingerstick) glucose performed at least 3 days per week. RESULTS: Approximately 2,700 glucose values were obtained by each subject during 3 months. Linear regression analysis between the A1C and AG values provided the tightest correlations (AG(mg/dl) = 28.7 × A1C − 46.7, R(2) = 0.84, P < 0.0001), allowing calculation of an estimated average glucose (eAG) for A1C values. The linear regression equations did not differ significantly across subgroups based on age, sex, diabetes type, race/ethnicity, or smoking status. CONCLUSIONS: A1C levels can be expressed as eAG for most patients with type 1 and type 2 diabetes. |
format | Text |
id | pubmed-2742903 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2008 |
publisher | American Diabetes Association |
record_format | MEDLINE/PubMed |
spelling | pubmed-27429032009-09-16 Translating the A1C Assay Into Estimated Average Glucose Values Nathan, David M. Kuenen, Judith Borg, Rikke Zheng, Hui Schoenfeld, David Heine, Robert J. Diabetes Care Original Research OBJECTIVE: The A1C assay, expressed as the percent of hemoglobin that is glycated, measures chronic glycemia and is widely used to judge the adequacy of diabetes treatment and adjust therapy. Day-to-day management is guided by self-monitoring of capillary glucose concentrations (milligrams per deciliter or millimoles per liter). We sought to define the mathematical relationship between A1C and average glucose (AG) levels and determine whether A1C could be expressed and reported as AG in the same units as used in self-monitoring. RESEARCH DESIGN AND METHODS: A total of 507 subjects, including 268 patients with type 1 diabetes, 159 with type 2 diabetes, and 80 nondiabetic subjects from 10 international centers, was included in the analyses. A1C levels obtained at the end of 3 months and measured in a central laboratory were compared with the AG levels during the previous 3 months. AG was calculated by combining weighted results from at least 2 days of continuous glucose monitoring performed four times, with seven-point daily self-monitoring of capillary (fingerstick) glucose performed at least 3 days per week. RESULTS: Approximately 2,700 glucose values were obtained by each subject during 3 months. Linear regression analysis between the A1C and AG values provided the tightest correlations (AG(mg/dl) = 28.7 × A1C − 46.7, R(2) = 0.84, P < 0.0001), allowing calculation of an estimated average glucose (eAG) for A1C values. The linear regression equations did not differ significantly across subgroups based on age, sex, diabetes type, race/ethnicity, or smoking status. CONCLUSIONS: A1C levels can be expressed as eAG for most patients with type 1 and type 2 diabetes. American Diabetes Association 2008-08 /pmc/articles/PMC2742903/ /pubmed/18540046 http://dx.doi.org/10.2337/dc08-0545 Text en © 2009 by the American Diabetes Association. Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered. See http://creativecommons.org/licenses/by-nc-nd/3.0/ for details. |
spellingShingle | Original Research Nathan, David M. Kuenen, Judith Borg, Rikke Zheng, Hui Schoenfeld, David Heine, Robert J. Translating the A1C Assay Into Estimated Average Glucose Values |
title | Translating the A1C Assay Into Estimated Average Glucose Values |
title_full | Translating the A1C Assay Into Estimated Average Glucose Values |
title_fullStr | Translating the A1C Assay Into Estimated Average Glucose Values |
title_full_unstemmed | Translating the A1C Assay Into Estimated Average Glucose Values |
title_short | Translating the A1C Assay Into Estimated Average Glucose Values |
title_sort | translating the a1c assay into estimated average glucose values |
topic | Original Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2742903/ https://www.ncbi.nlm.nih.gov/pubmed/18540046 http://dx.doi.org/10.2337/dc08-0545 |
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