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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...

Type I Diabetes III: Clinical Manifestations

Type I Diabetes III: Clinical Manifestations

Type 1 diabetes mellitus typically presents with rapid-onset symptoms due to the body’s inability to utilize glucose in the absence of insulin. Since insulin is required for glucose uptake into cells, its deficiency leads to hyperglycemia and cellular energy deprivation, resulting in characteristic clinical features.Polyuria and PolydipsiaOne of the earliest, most prominent symptoms is polyuria (excessive urination). When blood glucose concentrations rise above the renal threshold, the kidneys...

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...

Hypoglycemia

Hypoglycemia

Hypoglycemia is a blood glucose level below 70 mg/dL. It commonly occurs in individuals using insulin or insulin-secreting drugs, but may also arise in non-diabetic conditions. People with type 1 diabetes are at the highest risk because they depend on exogenous insulin. People with type 2 diabetes are also at risk, especially when treated with insulin or medications such as sulfonylureas, which increase insulin release regardless of blood glucose levels. It develops when insulin levels exceed...

Type II Diabetes II: Pathophysiology

Type II Diabetes II: Pathophysiology

PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.

Glucose Homeostasis: Regulation of Blood Glucose

Glucose Homeostasis: Regulation of Blood Glucose

Carbohydrates consumed through foods are converted into glucose, a crucial energy source for the body. In the prandial state, high blood glucose levels stimulate the secretion of insulin from the pancreas. Insulin inhibits hepatic glucose production and stimulates glucose uptake and metabolism by muscle and adipose tissue. The excess glucose is converted into glycogen and stored in the liver and muscles.
During fasting, when blood glucose levels are low, the pancreas secretes glucagon. it...

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Related Experiment Video

Updated: May 12, 2026

Study of In Vivo Glucose Metabolism in High-fat Diet-fed Mice Using Oral Glucose Tolerance Test (OGTT) and Insulin Tolerance Test (ITT)

Study of In Vivo Glucose Metabolism in High-fat Diet-fed Mice Using Oral Glucose Tolerance Test (OGTT) and Insulin Tolerance Test (ITT)

Published on: January 7, 2018

Post-prandial hyperglycemia.

Santosh Kumar Singh¹

¹Endocrinologist and Diabetologist, Patna, Bihar, India.

Indian Journal of Endocrinology and Metabolism

|April 9, 2013

Summary

This summary is machine-generated.

Isolated post prandial hyperglycaemia (PPHG) significantly increases cardiovascular mortality risk and contributes to overall glycaemia. Effective pharmacologic and non-pharmacologic therapies exist to manage PPHG and mitigate its severe health consequences.

Keywords:

HbA1c Post-prandial hyperglycemia cardiovascular mortality

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Hyperglycemic Clamp and Hypoglycemic Clamp in Conscious Mice

Hyperglycemic Clamp and Hypoglycemic Clamp in Conscious Mice

Published on: January 26, 2024

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Last Updated: May 12, 2026

Study of In Vivo Glucose Metabolism in High-fat Diet-fed Mice Using Oral Glucose Tolerance Test (OGTT) and Insulin Tolerance Test (ITT)

Study of In Vivo Glucose Metabolism in High-fat Diet-fed Mice Using Oral Glucose Tolerance Test (OGTT) and Insulin Tolerance Test (ITT)

Published on: January 7, 2018

Hyperglycemic Clamp and Hypoglycemic Clamp in Conscious Mice

Hyperglycemic Clamp and Hypoglycemic Clamp in Conscious Mice

Published on: January 26, 2024

Area of Science:

Endocrinology
Metabolic Disorders
Cardiovascular Health

Background:

Isolated postprandial hyperglycaemia (PPHG) is a significant risk factor for cardiovascular mortality.
PPHG contributes substantially to overall glycemic control, as reflected in HbA1c levels.
The adverse effects of PPHG extend to microvascular complications, cognitive decline, and cancer risk.

Purpose of the Study:

To highlight the critical health risks associated with isolated postprandial hyperglycaemia.
To emphasize the contribution of PPHG to overall glycaemia and cardiovascular mortality.
To review available therapeutic strategies for managing PPHG.

Main Methods:

Review of existing literature on postprandial hyperglycaemia.
Analysis of the impact of PPHG on cardiovascular outcomes and overall glycaemia.
Synthesis of data on pharmacologic and non-pharmacologic treatment options.

Main Results:

PPHG doubles the risk of cardiovascular mortality.
PPHG is a significant determinant of HbA1c levels.
Harmful effects include increased cardiovascular mortality, microvascular complications, cognitive decline, and cancers.

Conclusions:

Isolated postprandial hyperglycaemia poses serious health risks, including doubled cardiovascular mortality.
Management of PPHG is crucial for improving overall glycaemic control and reducing associated complications.
A range of therapeutic interventions are available for targeting PPHG.