Glucose is a simple sugar with the molecular formula C₆H₁₂O₆. Glucose circulates in the blood of animals as blood sugar. It is made during photosynthesis from water and carbon dioxide, using energy from sunlight. The reverse of the photosynthesis reaction, which releases this energy, is an important source of power for cellular respiration. Glucose is stored as a polymer, in plants as starch and in animals as glycogen, for times when the organism will need it.

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Blood Test glucose

If you had a fasting blood glucose test, a level between 70 and 100 milligrams per deciliter (mg/dL) is considered normal.

Urine Test glucose

The normal amount of glucose in urine is 0 to 0.8 mmol/L (millimoles per liter). Any number higher than this could indicate a problem. The most common diagnosis, confirmed by a simple blood test, is diabetes.