Fasting Glucose

Fasting glucose measures blood sugar levels after an overnight fast, crucial for diagnosing and monitoring diabetes.

📋 About This Biomarker

Fasting glucose refers to the level of glucose (sugar) in the blood after an individual has not eaten for at least 8 hours. It is a crucial indicator of metabolic health and is commonly used to diagnose and monitor diabetes and prediabetes. Glucose is the primary source of energy for the body's cells, and its levels are tightly regulated by insulin, a hormone produced by the pancreas. When fasting glucose levels are elevated, it can indicate that the body is not effectively using or producing insulin, leading to conditions like diabetes. Chronic high glucose levels can damage blood vessels, nerves, and organs, leading to complications such as cardiovascular disease, neuropathy, and kidney damage.

🎯 Why We Test This

Testing fasting glucose levels is essential for diagnosing and monitoring diabetes and prediabetes. It helps in identifying blood sugar imbalances early, guiding lifestyle changes and treatments to prevent complications. Regular monitoring is particularly important for individuals with risk factors such as obesity, a family history of diabetes, or existing metabolic disorders. Keeping glucose levels within a healthy range is vital for overall health and preventing long-term complications like heart disease, kidney damage, and nerve damage.

⚠️ What Affects It

Factors influencing fasting glucose levels include diet, physical activity, stress, illness, and medications (such as corticosteroids and beta-blockers). Conditions like diabetes, insulin resistance, and hormonal disorders (such as Cushing's syndrome) can significantly impact glucose levels. Lifestyle factors like obesity, lack of exercise, and poor diet also play a critical role.

📈 How to Improve

To manage high fasting glucose levels, adopting a healthy diet low in refined sugars and high in fiber, regular physical activity, maintaining a healthy weight, and possibly using medications like metformin are effective strategies. For levels close to being high, similar lifestyle modifications and regular monitoring are key to preventing further increases. For low fasting glucose levels, ensuring balanced meals with adequate carbohydrate intake and monitoring for symptoms of hypoglycemia are important. Consulting with a healthcare provider can help tailor strategies to maintain optimal glucose levels.

📊 Understanding Your Results (mmol/L)

Low (< 3 mmol/L)
Low fasting glucose levels (hypoglycemia) can result from excessive insulin production, certain medications, prolonged fasting, or underlying health conditions like adrenal insufficiency. Symptoms of hypoglycemia include shakiness, dizziness, sweating, and in severe cases, loss of consciousness. Managing hypoglycemia involves identifying and treating the underlying cause and ensuring adequate nutritional intake.
Optimal (3 - 5.5 mmol/L)
Normal fasting glucose levels indicate that the body's insulin response is functioning well, maintaining blood sugar levels within a healthy range. This balance helps prevent the risk of developing diabetes and other metabolic disorders. Maintaining a balanced diet and regular physical activity is essential to keep glucose levels stable. Fasting glucose levels near the upper limit suggest a risk for developing diabetes or prediabetes. It is a warning sign that lifestyle modifications, such as improving diet and increasing physical activity, are needed to prevent progression to diabetes. Regular monitoring of glucose levels and consultation with a healthcare provider can help manage and reduce this risk. Fasting glucose levels near the lower end of the reference range are typically not a cause for concern, suggesting that blood sugar regulation is effective. However, if symptoms of hypoglycemia (low blood sugar) are present, such as dizziness, sweating, and confusion, it may require further investigation.
High (> 5.5 mmol/L)
Elevated fasting glucose levels (hyperglycemia) indicate that the body is struggling to regulate blood sugar, often due to insulin resistance or insufficient insulin production. This can be a sign of diabetes or prediabetes and necessitates lifestyle changes and possibly medication to lower blood sugar levels and prevent complications. Symptoms of hyperglycemia can include increased thirst, frequent urination, fatigue, and blurred vision.
Also known as: Fasting Blood Glucose, glucose fasting, Glucose (Fasting)