Not eating enough, especially after taking diabetes medicine.Side effects from certain diabetes medicines.If you have diabetes, lower than normal glucose levels may be caused by: Stress from surgery, very serious illness, or trauma.High glucose levels may also be a sign of: If your results show higher than normal glucose levels, it may mean you have or are at risk for getting diabetes. If you are pregnant, you will likely get a blood glucose test between the 24th and 28th week of your pregnancy to check for gestational diabetes. Have had gestational diabetes (diabetes that happens only during pregnancy).Have a history of heart disease or stroke.You're more likely to develop diabetes if you: You may also need a blood glucose test if you have a high risk for developing type 2 diabetes. Having trouble seeing or speaking clearly.A fast heartbeat or arrhythmia (a problem with the rate or rhythm of your heartbeat).Symptoms of low blood glucose levels include: Numbness or tingling in your feet or hands.Weight loss when you're not trying to lose weight.Increased thirst and urination (peeing).Symptoms of high blood glucose levels include: Your health care provider may order a blood glucose test if you have symptoms of high glucose levels or low glucose levels. Other names: blood sugar, self-monitoring of blood glucose (SMBG), fasting plasma glucose (FPG), fasting blood sugar (FBS), fasting blood glucose (FBG), random blood sugar, glucose challenge test, oral glucose tolerance test (OGTT) Without treatment, severe low blood sugar can lead to major health problems, including seizures and brain damage. Certain conditions, such as liver disease, may cause low levels of blood glucose in people without diabetes, but this is uncommon. Low blood glucose levels ( hypoglycemia) are common among people with type 1 diabetes and people with type 2 diabetes who take certain diabetes medicines. High blood sugar may also be caused by other conditions that can affect insulin or glucose levels in your blood, such as problems with your pancreas or adrenal glands. High blood glucose levels ( hyperglycemia) may be a sign of diabetes, a disorder that can cause serious, long-term health conditions. Too much or too little glucose in the blood can be a sign of a serious medical condition. A hormone called insulin helps move glucose from your bloodstream into your cells. A blood glucose test measures the glucose levels in your blood.

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