Fasting Blood Sugar (Glucose), Serum/Plasma


Glucose is the major carbohydrate present in the peripheral blood and represents the major source of cellular energy. In the body, glucose is either converted into glycogen and stored in the liver or converted into fatty acids and stored in the adipose tissue. Glucose level is controlled by several hormones, however, insulin is considered the most important. Hyperglycaemia is most commonly caused by diabetes. Other conditions that cause hyperglycaemia include pancreatitis, thyroid dysfunction, renal failure and liver disease. Hypoglycaemia is less common and may be caused by insulinoma, hypopituitarism or may be insulin induced after injection.


Fasting blood glucose measurment is the most widely used test in the diagnosis of diabetes.

Sample Type, Quantity & Conditions

1 ml Serum 1 ml Li-Heparin, K2-EDTA, NaF/Na2-EDTA, KF/Na2-EDTA, NaF/K-Oxalate, or NaF/Citrate/Na2-EDTA Plasma Stability: 8 Hours at 15-25 °C 72 Hours at 2-8 °C Stability in Fluoride Plasma: 3 Days at 15-25 °C

Special Precautions

Separate serum within 30 minutes from blood collection. 8 hours fasting is required.

Normal Range

Normal: 70 - 99 mg/dL 3.89 - 5.50 mmol/L Impaired Diabetic: 100 -125 mg/dL 5.56 - 6.94 mmol/L Overt DM: > 125 mg/dL > 6.94 mmol/L

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