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Diabetes Mellitus: Overview and Type I Subtype

Diabetes Mellitus: Overview and Type I Subtype

Diabetes mellitus is a chronic metabolic disorder characterized by high blood glucose levels due to inadequate insulin production, insulin resistance, or both. The condition affects millions worldwide and can significantly impact their health and quality of life.
Type 1 diabetes is an autoimmune disease in which the immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the body is unable to produce sufficient insulin, and individuals with...

Diabetes Mellitus: Type 2 and Gestational

Diabetes Mellitus: Type 2 and Gestational

Type 2 diabetes, characterized by insulin resistance, arises when the insulin receptors on cells lose responsiveness to insulin, diminishing the cell's capacity to take up glucose, resulting in elevated blood glucose levels. To receive a diagnosis of Type 2 diabetes, a series of blood glucose tests are necessary to assess whether the blood glucose falls within normal parameters. If the result is out of the normal range, a patient may be diagnosed as prediabetic or diabetic, depending on the...

Diabetes: Symptoms, Diagnosis, and Complications

Diabetes: Symptoms, Diagnosis, and Complications

For most patients, experiencing several weeks of polyuria, polydipsia, fatigue, and significant weight loss may indicate the presence of diabetes. Furthermore, adults displaying the phenotypic appearance of type 2 diabetes (particularly those who are obese and not initially insulin-requiring), may have islet cell autoantibodies, suggesting autoimmune-mediated β cell destruction and a diagnosis of latent autoimmune diabetes of adults (LADA). The categorization of glucose homeostasis is based on...

Diabetes Mellitus: Introduction

Diabetes Mellitus: Introduction

Diabetes mellitus consists of chronic metabolic disorders characterized by persistent hyperglycemia. This elevated blood glucose results from defects in insulin secretion, impaired insulin action, or both. Insulin, produced by pancreatic β-cells, is essential for maintaining glucose homeostasis by facilitating cellular glucose uptake for energy or storage. Disruptions in insulin production or function lead to glucose accumulation in the bloodstream, causing the clinical features and long-term...

Type II Diabetes Mellitus III: Clinical Manifestations and Diagnosis

Type II Diabetes Mellitus III: Clinical Manifestations and Diagnosis

Type 2 diabetes mellitus develops gradually and is often asymptomatic in early stages.Clinical ManifestationsWhen symptoms appear, they include fatigue, blurred vision, pruritus, delayed wound healing, and recurrent infections, particularly candidal infections. Peripheral neuropathy may present as numbness or tingling in the extremities. Classic hyperglycemia symptoms—polyuria, polydipsia, and polyphagia—are less common. Most patients are overweight and frequently have associated hypertension...

Hyperglycemia

Hyperglycemia

Hyperglycemia is an abnormally high blood glucose level. It is diagnosed by fasting glucose ≥126 mg/dL, 2-hour oral glucose tolerance test (or OGTT) ≥200 mg/dL, random glucose ≥200 mg/dL with symptoms, or HbA1c ≥6.5%. However, HbA1c results may be unreliable in certain conditions, such as anemia or hemoglobinopathies, and the diagnosis should be confirmed unless classic symptoms are present. Postprandial hyperglycemia is typically considered significant when glucose levels exceed 180 mg/dL two...

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Updated: Jul 12, 2026

Electrochemiluminescence Assays for Human Islet Autoantibodies

Electrochemiluminescence Assays for Human Islet Autoantibodies

Published on: March 23, 2018

Hemoglobin A Ic and diabetes mellitus

R J Koenig, A Cerami

Annual Review of Medicine

|January 1, 1980

Summary

Hemoglobin A1c (HbA1c) forms from nonenzymatic glucose reactions with hemoglobin. HbA1c levels reflect long-term blood glucose control, aiding diabetes management and potentially explaining diabetes complications and aging changes.

Area of Science:

Biochemistry
Endocrinology
Gerontology

Background:

Hemoglobin A1c (HbA1c) is a marker of glycemic control.
Nonenzymatic glycosylation is a key biochemical process.

Purpose of the Study:

To explain the formation and significance of HbA1c.
To explore HbA1c as a model for diabetes complications and aging.

Main Methods:

Describes the nonenzymatic reaction of glucose with hemoglobin beta chains.
Mentions the Amadori rearrangement process.

Main Results:

HbA1c concentration correlates with mean blood glucose over preceding weeks to months.
HbA1c measurements provide a reliable assessment of long-term carbohydrate control in diabetics.

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Electrochemiluminescence Assays for Human Islet Autoantibodies

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Conclusions:

HbA1c is a valuable tool for monitoring diabetes management.
Nonenzymatic glycosylation may underlie diabetic sequelae and aspects of aging.