Check the reading as soon as you can once you are awake. It has been my experience that if I wake up in the middle of the night and then go back to sleep a little later, my FBS reading is a bit higher than when I wake up after a sleep without interruptions.
Another suggestion to you is don't start your day with a cup of tea alone. I know it is a standard practice among most people in India to start off with a cup of tea or coffee. Start the day with a small apple or pear then go for your walk. Upon return from the walk you can eat your breakfast and then have your tea. Bottom line don't have tea or coffee on an empty stomach.
Fasting blood sugar test. A blood sample will be taken after you fast for at least eight hours or overnight. Under these conditions, a blood sugar level lower than 100 milligrams per deciliter (mg/dL) — 5.6 millimoles per liter (mmol/L) — is normal.
A blood sugar level from 100 to 125 mg/dL (5.6 to 6.9 mmol/L) is considered prediabetes. This is sometimes referred to as impaired fasting glucose (IFG). A blood sugar level of 126 mg/dL (7.0 mmol/L) or higher may indicate diabetes mellitus.
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