Another cause of high blood sugar is when the body is in a state of physical stress associated with critical illness like a stroke or heart attack. An active blood infection, known as sepsis, is often seen with blood sugar levels that are high. During these times of stress, the body releases its own hormones that can raise blood sugar. The level that the blood sugar reaches can change from person to person and should not be used as a diagnosis of diabetes. Further testing, such checking blood sugar levels after not eating for 8 hours or checking a special test of red blood cells can show if there really is a diagnosis of diabetes.
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