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🧪 What is Fasting Blood Glucose?

Fasting Blood Glucose measures the concentration of glucose in the blood after an overnight fast (typically 8-12 hours). It reflects the body’s ability to regulate blood sugar levels in the absence of recent food intake.

❓ Why is the Test Done?

To:

Diagnose diabetes mellitus and prediabetes
Monitor glucose control in diabetic patients
Screen individuals at risk for diabetes
Evaluate unexplained symptoms like polyuria, polydipsia, and weight loss

📊 Normal Range

Fasting Blood Glucose Level	Interpretation
70 – 99 mg/dL	Normal
100 – 125 mg/dL	Prediabetes (Impaired fasting glucose)
≥ 126 mg/dL	Diabetes mellitus (confirmed on repeat test)

📈 Interpretation of Results

Result	Clinical Implication
Normal fasting glucose	Normal glucose metabolism
Impaired fasting glucose	Increased risk of developing diabetes
High fasting glucose	Indicates diabetes mellitus

🧠 Associated Conditions

Condition	Details
Type 1 and Type 2 diabetes	Chronic hyperglycemia due to insulin deficiency/resistance
Prediabetes	Increased risk for diabetes and cardiovascular disease
Other causes of hyperglycemia	Stress, infections, medications

🔄 Related / Follow-Up Tests

Oral Glucose Tolerance Test (OGTT)
HbA1c (Glycated Hemoglobin)
Random Blood Glucose
C-Peptide
Insulin levels

✅ Fasting Required?

Test	Fasting Required
Fasting Blood Glucose	✅ Yes, 8–12 hours fasting recommended

📝 Summary Table

Parameter	Details
What	Blood glucose measurement after fasting
Why	Diagnose and monitor diabetes
Normal Range	70–99 mg/dL
Prediabetes Range	100–125 mg/dL
Diabetes Range	≥126 mg/dL
Associated Conditions	Diabetes mellitus, prediabetes
Follow-up Tests	OGTT, HbA1c, random glucose
Fasting Required	✅ Yes (8–12 hours fasting)

Sugar (Glucose) Fasting

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