Fasting Blood Glucose Test

Other Names for the Test

Fasting Plasma Glucose (FPG) Test 

Fasting Sugar Test 

Fasting Blood Sugar (FBS) Test 

What Is a Fasting Blood Glucose Test? 

The Fasting Blood Sugar (FBS) Test is used to measure the glucose (sugar) level in your blood after an overnight fast (at least 8-12 hours without food or drink except water). Glucose is your body’s primary source of energy, and it is important to maintain the ideal range for overall health. 

This test helps in diagnosing conditions like: 

• Diabetes: High blood glucose levels (hyperglycemia) may indicate Diabetes. 
• Hypoglycemia: Low blood glucose levels can lead to fatigue and other health issues. 
• Pre-Diabetes: Helps detect early signs of glucose imbalance. 

When Should I Book a Fasting Blood Glucose Test? 

Book a fasting blood glucose test if you experience any of the following symptoms or conditions: 

• Frequent urination
• Increased thirst
• Unexplained weight loss 
• Fatigue, irritability, or blurred vision 
• Slow-healing wounds or recurrent infections 
• Family history of Diabetes 
• Routine screening if you are over 45 or have risk factors like obesity or high blood pressure 

What Preparations Are Required Before Taking the Fasting Plasma Glucose (FPG) Test? 

For accurate results, ensure the following: 

Fasting: Do not eat or drink anything except water for at least 8-12 hours before the test. 

Medications: Inform your doctor about any medications, as some may affect glucose levels. 

Avoid Stress and Exercise: Both can temporarily raise blood sugar levels. 

What Will Happen During the Fasting Blood Glucose Test? 

The procedure involves a standard blood draw: 

• A healthcare provider cleans your arm and inserts a needle into a vein. 
• A small blood sample is collected into a vial or syringe. 
• The sample is sent to a laboratory for analysis. 
• The process is quick and usually takes a few minutes.

What is the Normal Range for a Fasting Sugar Test? 

Normal: 70-100 mg/dL 

Pre-Diabetes: 100-125 mg/dL 

Diabetes: 126 mg/dL or higher 

What Do the Results Mean? 

High Levels (Hyperglycemia): 

Possible reasons for elevated blood glucose include: 

• Diabetes (Type 1 or Type 2) 
• Gestational Diabetes during pregnancy 
• Pancreatic Disorders 
• Stress or Illness 

Low Levels (Hypoglycemia): 

Possible reasons for low blood glucose include: 

• Insulin Overdose or excessive diabetes medications 
• Fasting for Too Long 
• Liver Disease or adrenal insufficiency 
• Excessive Alcohol Consumption 

When Should I Call My Doctor? 

Contact your doctor if: 

• Your fasting glucose level is consistently above 126 mg/dL or below 70 mg/dL. 
• You experience symptoms like fainting, confusion, or extreme fatigue. 
• Your results indicate pre-diabetes or Diabetes requiring lifestyle or medication changes. 

How Frequently Should I Take the Fasting Blood Glucose Test? 

Routine Screening: Every 1-3 years if you’re over 45 or have risk factors. 

Diabetes Management: As directed by your doctor.

Pregnancy: Regularly if there’s a risk of gestational Diabetes.