MARTIN DOHRN / SCIENCE PHOTO LIBRARY MARTIN DOHRN / SCIENCE PHOTO LIBRARY
Testing blood sugar levels by taking a sample of blood, applying a test strip for glucose in the blood and measuring the reaction against a chart. Blood testing is a preliminary procedure before injecting insulin. The form of diabetes portrayed here is diabetes mellitus, an inability of the body to use sugar in the blood as a source of energy due to a lack of insulin (hormone) responsible for controlling blood sugar levels. Instead the sugar is passed out with urine.
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