Blood flows from the arteries to capillaries through which it supplies oxygen and glucose to the ultimate targets of delivery- the tissues and then flows out through the veins. Hence capillary blood has more glucoe than in the venous blood as some has been utilized by the tissues.

Glucometers test the capillary Blood Glucose levels which may be 10 -20 mg/dl higher than what is measured in the venous blood (which is what is usually measured in the Laboratories).

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