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Glucometers are an indispensable device for self-monitoring of blood glucose in the toolkit of people with diabetes or prediabetes. A glucometer derives the blood sugar level from the test strip and displays the results on the monitor. The results are displayed in mg/dl or mmol/l of glucose.

The level of glucose in your blood changes throughout the day (and night). It is also affected by your diet and exercise.

According to Dr Shradha Doshi, Consultant Diabetologist, DiabPlus Clinic, “Safe range of blood glucometer readings varies from patient to patient. For a middle-aged patient with diabetes and no other co-morbidities, FBS should be in the range of 80 – 110 mg/dl & PPBS should be less than 140 mg/dl.

For an elderly patient with diabetes or those patients who have other co-morbidities like end-stage renal or liver disease, blood sugars should always be in the range of 95  – 140 mg/dl as very tight control of blood sugars can give them serious hypoglycemia episodes.

For patients with Diabetes in Pregnancy (Gestational Diabetes Mellitus), FBS must be less than 95 mg/dl and PPBS must be less than 120 mg/dl as high sugars pose great challenges to the health of both mother and baby. It is recommended to always check with your doctor regarding your personal safe range of glucometer readings and not just rely on general guidelines.”

The normal values of glucose for adults who do not have diabetes or prediabetes are the following:

Fasting blood sugar

(when you have not eaten for at least 8 hours)

70 to 100 mg/dl (4.0 to 5.4 mmol/l)
Postprandial blood sugar

(2 hours after a meal)

Less than or equal to 140 mg/dl (7.8 mmol/l)
Random blood sugar

(irrespective of your meal time)

Levels vary depending on what and when was the last time.

Should be less than 140 mg/dl (7.8 mmol/l) if not taken soon after a meal.

Morning values are usually less than 120 mg/dl (6.7 mmol/l).


For people with diabetes, blood glucose levels tend to be higher, and the doctor usually sets a target range. While this may differ from person to person, the usual target values (recommended by the American Diabetes Association and Joslin Diabetes Center) are as follows:

Fasting blood sugar 80 to 130 mg/dl (4.4 to 7.2 mmol/l)
Postprandial blood sugarLess than 180 mg/dl (10.0 mmol/l)
Bedtime blood sugar90 to 150 mg/dl (5.0 to 8.3 mmol/l)

However, some guidelines (e.g., American Association of Clinical Endocrinologists) have stricter target ranges for people with diabetes:

Fasting blood sugar70 to 130 mg/dl (4.0 to 7.2 mmol/l)
Postprandial blood sugarLess than 140 mg/dl (7.8 mmol/l)


A reading lower than 70 or 80 mg/dl may indicate hypoglycemia, or low blood sugar level. When this happens, you should take a sugary drink and/or contact a doctor immediately.

The best way to keep your blood sugar under check is by maintaining logs of your readings. The Wellthy Care app lets you maintain a log of your blood glucose readings and also offers tends after every 4 logs. Every user has access to a dedicated health coach. The more you log, the more the health coach learns about your health profile and suggest lifestyle modifications to help keep your blood sugar readings under check.

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Disclaimer: The information provided in this article is for patient awareness only. This has been written by qualified experts and scientifically validated by them. Wellthy or it’s partners/subsidiaries shall not be responsible for the content provided by these experts. This article is not a replacement for a doctor’s advice. Please always check with your doctor before trying anything suggested on this article/website.