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Glycated hemoglobin

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Glycated hemoglobin (HbA1c) is a form of hemoglobin that is chemically linked to glucose, reflecting average blood glucose levels over the preceding two to three months. It is commonly used as a biomarker for diagnosing and monitoring diabetes mellitus and assessing long-term glycemic control.
lightbulbAbout this topic
Glycated hemoglobin (HbA1c) is a form of hemoglobin that is chemically linked to glucose, reflecting average blood glucose levels over the preceding two to three months. It is commonly used as a biomarker for diagnosing and monitoring diabetes mellitus and assessing long-term glycemic control.

Key research themes

1. How do interindividual variations in glycated hemoglobin (HbA1c) independent of glucose levels influence risk assessment and clinical interpretation in diabetes?

This research theme investigates the biological and clinical implications of variability in HbA1c levels that cannot be explained solely by plasma glucose concentrations, exploring indices like the Hemoglobin Glycation Index (HGI) and factors that modulate HbA1c independent of glycemia. Understanding these variations is crucial for improving individualized risk stratification for cardiovascular disease (CVD) and diabetic complications, as well as interpreting HbA1c measurements correctly in diverse populations and clinical conditions.

Key finding: Comparison of boronate affinity chromatography and immunoassay methods for HbA1c measurement across samples with variable hemoglobin, triglycerides, and blood urea nitrogen (BUN) demonstrated that these biochemical variables... Read more
Key finding: In hemodialysis patients with diabetes, the reduced red blood cell lifespan attenuates HbA1c levels relative to mean plasma glucose (MPG), resulting in poor correlation between HbA1c and MPG over three months. The study found... Read more

2. What are the methodological considerations and challenges in accurate measurement of glycated hemoglobin in clinical practice?

This theme covers methodological evaluation of HbA1c assays, including comparison of chromatographic and immunoassay techniques, impact of preanalytical sample factors, and confounding biochemical interferences. Advances and limitations in assay precision, influence of hemoglobin variants and hematologic conditions, and standardization challenges are key for reliable clinical interpretation and consistent diabetes diagnosis and monitoring.

Key finding: Four chromatographic systems—Variant I, Micromat II, In2it, and BIOMIDI reagent kit—were compared for HbA1c measurement. While positive correlations existed between methods, notable discrepancies occurred in samples with... Read more
Key finding: The study identified that biochemical variables such as hemoglobin concentration, triglycerides, and blood urea nitrogen affect the agreement between boronate affinity chromatography and turbidimetric inhibition immunoassay... Read more
Key finding: This foundational review delineates the biochemical basis of glycated hemoglobin variants, outlining differences in sites of glycation and methods of detection such as cation-exchange chromatography, immunoassays, and... Read more

3. How do comorbid conditions, hemoglobinopathies, and end-stage renal disease (ESRD) affect the diagnostic and prognostic utility of HbA1c and alternative glycemic markers?

This theme explores the alterations in HbA1c reliability caused by coexisting disorders such as hemoglobin variants, thalassemia, dialysis-dependent CKD, and anemia. It evaluates clinical implications on diabetes diagnosis and monitoring, the need for alternative biomarkers like glycated albumin, and adjustments in clinical guidelines to account for these confounders. Understanding these influences is critical for optimizing glycemic control and reducing complications in complex patient populations.

Key finding: In patients with thalassemia syndromes, altered erythrocyte turnover and hemoglobin abnormalities significantly distort the relationship between plasma glucose and HbA1c levels. The study highlights that HbA1c measurement... Read more
Key finding: Comparative evaluation in diabetic and non-diabetic hemodialysis patients demonstrated that glycated albumin (GA) better reflects glycemic status than HbA1c, which is confounded by shortened erythrocyte lifespan and uremic... Read more
Key finding: This cross-sectional comparison revealed that diabetic patients with ESRD had significantly lower HbA1c levels but elevated GA compared to diabetic patients without ESRD. Negative correlation between HbA1c and serum urea... Read more
Key finding: Large-scale screening via CE-HPLC identified hemoglobinopathies in 18.44% of 65,779 cases, predominantly beta-thalassemia trait. The study underscores the high prevalence of hemoglobin variants that can distort HbA1c... Read more
Key finding: The discovery of a novel β-globin missense variant (c.134 C>T; p.S44F) named Hb Narges Lab in a heterozygote expanded the spectrum of hemoglobin variants with possible clinical implications. While hematologic parameters were... Read more

All papers in Glycated hemoglobin

BACKGROUND Adults with type 1 diabetes (PWDs) face challenging self-management regimens including monitoring their glucose values multiple times a day to assist with achieving glycemic targets and reduce the risk of long-term diabetes... more
1) Background: Sarcopenia has gained much interest in recent years due to an increase in morbidity. Sarcopenia is associated with type 2 diabetes mellitus (T2DM) and vice versa. There is a paucity of information regarding the prevalence... more
Diabetes has been associated with Coronary Artery Disease (CAD). The atherosclerosis, underlying the pathogenesis of CAD, has been activated since the early stages of hyperglycemia and accelerated with uncontrolled blood sugar level... more
Diabetes mellitus (DM) has a growing prevalence worldwide, even in developing countries. Many antidiabetic agents are used to improve glycemic control; however, in cases of an insufficient outcome, insulin is administered. Yet, the timing... more
BACKGROUND: Near Infrared Spectroscopy (NIRS) combined with the method of partial jugular venous occlusion (JVO) has been introduced to measure cerebral venous saturation (CVSO2) at the bedside. As yet, the method has not been validated... more
Gestational diabetes mellitus (GDM) is associated with an increased prevalence of fetal and maternal complications primarily caused by maternal hyperglycemia, which results in abnormal fetal growth. Diet modification is a common first... more
Background. Telemedicine has recently become a more important platform for the delivery of health interventions such as blood glucose monitoring and a range of other health concerns. Objectives. The purpose of this systematic review and... more
Background: Vitamin D deficiency is seen more frequently in diabetic patients with distal symmetrical polyneuropathy. Unfortunately, there is a shortage of data concerning prediabetic individuals with peripheral neuropathy (PN).... more
This study evaluated the relationship between the zinc-related nutritional status and glycemic and insulinemic markers in individuals with type 2 diabetes mellitus (T2DM). A total of 82 individuals with T2DM aged between 29 and 59 years... more
Glycated hemoglobin (HbA1c) indicates average glucose levels over three months and is associated with insulin resistance and type 2 diabetes (T2D). Longitudinal changes in HbA1c (ΔHbA1c) are also associated with aging processes, cogniQve... more
All the coauthors reviewed and approved submission of the manuscript to Diabetes. P.A. is the guarantor of this work, and as such, had full access to all the data in the study and takes responsibility for the integrity of the data and the... more
OBJECTIVE Glycated hemoglobin (HbA1c) is a stable index of chronic glycemic status and hyperglycemia associated with progressive development of insulin resistance and frank diabetes. It is also associated with premature aging and... more
To avoid insulin-induced hypoglycemia and weight gain, the minimum dose of insulin should be used. In this study, therefore, we examined insulin dose reduction by ipragliflozin add-on therapy in Japanese patients with type 2 diabetes... more
To avoid insulin-induced hypoglycemia and weight gain, the minimum dose of insulin should be used. In this study, therefore, we examined insulin dose reduction by ipragliflozin add-on therapy in Japanese patients with type 2 diabetes... more
This study focused on the evaluation of antioxidant and antidiabetic activities of polyherbal extract (PHE), containing Cassia absus (L.), Gymnema sylvestre (R. Br.), Nigella sativa (L.), and Piper nigrum (L.), in alloxan-induced diabetes... more
Pancreas transplantation (PTx) represents the method of choice in type 1 diabetic patients with conservatively intractable hypoglycemia unawareness syndrome. In 2005, the Institute for Clinical and Experimental Medicine (IKEM) launched a... more
Background: Glycated hemoglobin A1c (A1C) is an important marker in the diagnosis and treatment of diabetes. Dried blood measurement of A1C is useful in large scale epidemiological evaluation of A1C, especially to assess the impact of... more
Effects of nutrition education using a food-based approach, carbohydrate counting or routine care in type 1 diabetes: 12 months prospective randomized trial.
Type 2 diabetes exerts a negative impact on sleep breathing. It is unknown whether a long-term improvement in glycemic control ameliorates this effect. We conducted an interventional study with 35 patients with type 2 diabetes and... more
Childhood obesity is a serious public health problem worldwide. The ENDORSE platform is an innovative software ecosystem based on Artificial Intelligence which consists of mobile applications for parents and health professionals, activity... more
Objectives: Diabetic peripheral neuropathy (DPN) is a common and debilitating complication of diabetes mellitus, affecting approximately 50% of patients over the course of their disease. Early detection and management are essential for... more
Background and aim: Type 2 diabetes (T2D) is a complex polygenic disease with unclear mechanisms. Clinical studies on the association of vitamin A with T2D in humans are still controversial. Herein, we aimed to investigate the plasma... more
BACKGROUND: Type 2 diabetes was related with larger cognitive decline. However, other glycemic dysregulations showed inconsistent results. Our aim was to examine longitudinal associations between diabetes/glycemic status and cognitive... more
To evaluate the real-world clinical outcome of guideline-based treatment among adherent and committed type 2 diabetes mellitus (T2DM) patients. The study reports the outcomes of an 11-year clinic-based standard care regime, based on the... more
To evaluate the real-world clinical outcome of guideline-based treatment among adherent and committed type 2 diabetes mellitus (T2DM) patients. The study reports the outcomes of an 11-year clinic-based standard care regime, based on the... more
Background Type 2 diabetes mellitus is a chronic disease affecting millions of people worldwide. Achieving and maintaining glycemic control is essential to prevent or delay complications and different strategies are available as... more
The prevalence of type 2 diabetes is rising with the majority of patients practicing inadequate disease self-management. Depression, anxiety, and diabetes-specific distress present motivational challenges to adequate self-care. Health... more
This study is the proof-of-concept of our "Gravicentric" theory. This concept is based on several fundamental points: obesity as the main foe; rapid reversibility of the disease; as well as a new perspective on the roles... more
Aims/Introduction:  Chronic inflammation aggravates glycemic control in patients with type 2 diabetes mellitus. An increase or decrease in the release and activities of various inflammatory mediators, such as tumor necrosis factor... more
Diabetes mellitus (DM) is a heterogeneous metabolic disorder characterized by chronic hyperglycaemia, higher glycated hemoglobin (HbA1C) as well as protein. Oxidative stress can cause damage to leukocytic DNA and enhancement of... more
recommended diet, physical activity, and oral hygiene practices, respectively. Diabetes selfcare practice explained the highest proportion of the variance (13.9%) followed by oral hygiene practices (10.9%) by modelling any periodontal... more
Aim The coronavirus disease (COVID)-19 incidence was higher in diabetes mellitus (DM), although several differences should be considered on the basis of characteristics of cohorts evaluated. This study was designed to evaluate the... more
Glycated hemoglobin (HbA1c) is used to assess glycemic control in Type 1 diabetes (DM1) patients. Apolipoproteins play an essential role in DM1 pathophysiology and may be associated with complications and HbA1c. This cross-sectional... more
Diabetes mellitus (DM) is an ensemble of metabolic conditions that have reached pandemic proportions worldwide. Pathology’s multifactorial nature makes patient management, including lifelong drug therapy and lifestyle modification,... more
To investigate the efficacy and safety of empagliflozin in subgroups based on body mass index (BMI) and age, using a pooled data set from Japanese patients with type 2 diabetes mellitus (T2DM). Methods: Pooled data from 1403 patients... more
Introduction Although individualized target glycated hemoglobin (HbA 1c ) levels are recommended in older people with type 2 diabetes, studies report high levels of potential overtreatment. We aimed to investigate the proportion of older... more
DISCOVER is a 3-year observational study program of 15,983 people with type 2 diabetes initiating second-line glucose-lowering therapy in 38 countries. We investigated the association between socioeconomic status and both the availability... more
Diabetes has developed as a major worldwide open wellbeing issue. This is the study inquiring the dimension of factors among different group of diabetes patient using questionnaire method. Result shows an association between the diabetes... more
Objective: To evaluate neuropathic pain (NP), its intensity, and complications in people with type 2 diabetes mellitus (T2DM) in a city of eastern São Paulo. Method: Cross-sectional study conducted with 96 individuals with T2DM served by... more
Objective: To evaluate neuropathic pain (NP), its intensity, and complications in people with type 2 diabetes mellitus (T2DM) in a city of eastern São Paulo. Method: Cross-sectional study conducted with 96 individuals with T2DM served by... more
comparators using Swedish-specific data, where available. Direct and indirect costs were reported in 2012 Euro [1 Euro (€ ) = 8.91 Swedish Krona] and an annual discount rate of 3% was applied on costs and effects. Results: With inclusion... more
comparators using Swedish-specific data, where available. Direct and indirect costs were reported in 2012 Euro [1 Euro (€ ) = 8.91 Swedish Krona] and an annual discount rate of 3% was applied on costs and effects. Results: With inclusion... more
Type 2 diabetes mellitus (T2DM) is a chronic metabolic disease with substantial morbidity, mortality, and economic impacts. Glucagon-like peptide-1 (GLP-1) receptor agonists, such as once-daily (QD) liraglutide and once-weekly (QW)... more
Purpose The objective of this post-market study was to evaluate long-term safety and efficacy of aspiration therapy (AT) in a clinical setting in five European clinics. The AspireAssist® System (Aspire Bariatrics, Inc. King of Prussia,... more
Purpose The objective of this post-market study was to evaluate long-term safety and efficacy of aspiration therapy (AT) in a clinical setting in five European clinics. The AspireAssist® System (Aspire Bariatrics, Inc. King of Prussia,... more
SummaryPatients with obstructive sleep apnea (OSA) are at increased risk of developing metabolic disease such as diabetes. The effects of positive airway pressure on glycemic control are contradictory. We therefore evaluated the change in... more
Background: HbA1c result provide information on metabolic control in diabetes mellitus (DM) and could also be used for its diagnosis. For its determination, the laboratory must be certified by the National Glycohemoglobin Standardization... more
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