Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Diabetes Health Center

Font Size

Checking Blood Glucose Levels

When a person's body is operating normally, it automatically checks the level of glucose in blood. If the level is too high or too low, the body will adjust the sugar level to return it to normal. This system operates in much the same way that cruise control adjusts the speed of a car. With diabetes, the body doesn't do the job of controlling blood glucose automatically. To make up for this, someone with diabetes has to check blood sugar regularly and adjust treatment accordingly.

A doctor can measure blood glucose during an office visit. However, levels change from hour to hour and someone who visits the doctor only every few weeks won't know what his or her blood glucose is daily. Do-it-yourself tests enable people with diabetes to check their blood sugar daily.

Recommended Related to Diabetes

Ask the Expert: What Is Prediabetes?

Expert Rita Rastogi Kalyani, MD, MHS, is an assistant professor at Johns Hopkins School of Medicine. Q: What is prediabetes, and how can I stop it from becoming full-blown diabetes? A: Prediabetes means your blood sugar (glucose) level is above normal, but not high enough to be considered diabetes. The higher level means your body is starting to have trouble using the hormone insulin, which normally moves glucose from the blood into your body's cells. Without insulin working properly, glucose...

Read the Ask the Expert: What Is Prediabetes? article > >

The easiest test someone can do at home is a urine test. When the level of glucose in blood rises above normal, the kidneys eliminate the excess glucose in urine. Glucose in urine, therefore, reflects an excess of glucose in blood.

Urine testing is easy. Tablets or paper strips are dipped in urine. The color change that occurs indicates whether blood glucose is too high. However, urine testing is not completely accurate because the reading reflects the level of blood glucose a few hours earlier. In addition, not everyone's kidneys are the same. Even when the amount of glucose in two people's urine is the same, their sugar levels may be different. Certain drugs and vitamin C also can affect the accuracy of urine tests.

It's more accurate to measure blood glucose directly. Kits are available that allow people with diabetes to test their blood glucose at home. The test involves pricking a finger to draw a drop of blood. A spring-operated "lancet" does this automatically. The drop of blood is placed on a strip of specially coated plastic or into a small machine that "reads" how much glucose is in the blood. A doctor may suggest that someone test his or her blood glucose several times a day. Self-blood glucose monitoring can show how the body responds to meals, exercise, stress, and diabetes treatment.

Another test that measures the effectiveness of treatment is a "glycosylated hemoglobin" test. It measures the glucose that has become attached to hemoglobin, the molecule in red blood cells that gives blood its red color. Over time, hemoglobin absorbs glucose, according to its concentration in blood. Once glucose is absorbed by hemoglobin it remains there until the blood cells die and new ones replace them. With the "glycosylated hemoglobin" test, a doctor can tell whether blood glucose has been very high over the last few months.

Today on WebMD

Diabetic tools
Symptoms, diagnosis, treatment, and more.
woman flexing muscles
10 strength training exercises.
Blood sugar test
12 practical tips.
Tom Hanks
Stars living with type 1 or type 2.
kenneth fujioka, md
Can Vinegar Treat Diabetes
Middle aged person
Home Healthcare

Prediabetes How to Prevent Type 2 Diabetes
type 2 diabetes
food fitness planner