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Chapter 3: Testing Your Blood Sugar

Symptoms of High or Low Blood Sugar

Being aware of the symptoms of high or low blood sugar can help you understand your test results and

decide what to do if they seem unusual. Here are the most common symptoms:

High blood sugar (hyperglycemia): fatigue, increased appetite or thirst, frequent urination, blurred vision,

headache, or general aching.

Low blood sugar (hypoglycemia): sweating, trembling, blurred vision, rapid heartbeat, tingling, or numbness

around mouth or fingertips.

If you are experiencing any of these symptoms, test your blood sugar. If your result is displayed as LO

or HI, contact your doctor immediately.

Unusual Test Results

If your blood sugar result doesn’t match the way you feel, follow these steps:

1. Run a control test (see page 16).

2. Repeat a blood sugar test, (see page 21).

3. If your blood sugar results still don’t reflect the way you feel, call your doctor immediately.

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