How do you read glucose tolerance test results?


  1. A normal blood glucose level is lower than 140 mg/dL (7.8 mmol/L).
  2. A blood glucose level between 140 and 199 mg/dL (7.8 and 11 mmol/L) is considered impaired glucose tolerance, or prediabetes.
  3. A blood glucose level of 200 mg/dL (11.1 mmol/L) or higher may indicate diabetes.

What is standard glucose tolerance test?

The glucose tolerance test is a lab test to check how your body moves sugar from the blood into tissues like muscle and fat. The test is often used to diagnose diabetes. Tests to screen for diabetes during pregnancy are similar, but are done differently.

How do you do a 75 OGTT test?

For this test:

  1. DO NOT eat or drink anything (other than sips of water) for 8 to 14 hours before your test.
  2. You will be asked to drink a liquid that contains glucose (75 g).
  3. You will have blood drawn before you drink the liquid, and again 2 more times every 60 minutes after you drink it.

What is mandatory before glucose tolerance test?

To perform the glucose tolerance test, the patient should be instructed to eat a normal carbohydrate diet of at least 150 grams of carbohydrates for at least 3 days prior to the test. On the day of the test typically a patient must arrive in a fasting state.

How do you know if you failed the glucose test?

If a patient has two or more abnormal values during the three-hour test, then the test overall is considered abnormal. Your doctor will likely diagnose you with gestational diabetes if you fail the three-hour test.

What is a failed glucose test number?

If your blood glucose level for this screening is higher than 200 mg/dL, most providers will consider you diabetic and you won’t be required to take the glucose tolerance test. But any score between 140 and 200 means that you’ll have to take the three-hour glucose tolerance test for a definite diagnosis.

Which glucose is used for GTT test?

The test can be done at any time of the day. It involves drinking a glass of concentrated glucose solution (50 g of glucose dissolved in 250 to 300 ml of water). After one hour has passed, a blood sample is taken to determine the blood sugar level.

What is the 2 hour glucose tolerance test?

Oral Glucose Tolerance Test (OGTT)

The OGTT is a two-hour test that checks your blood glucose levels before and two hours after you drink a special sweet drink. It tells the doctor how your body processes sugar.

When do you use 75g OGTT?

It has been recommended that a 2-h 75-g OGTT be performed on all women at 24 to 28 weeks’ gestation not previously found to have overt diabetes or gestational diabetes mellitus (GDM) during early testing in their current pregnancy.

Is GTT same as OGTT?

The Glucose Tolerance Test (GTT), also referred to as the Oral Glucose Tolerance Test (OGTT), is a method which can help to diagnose instances of diabetes mellitus or insulin resistance.

How long does GTT results take?

Two hours after the drink, another blood sample will be taken to see how your body has dealt with the sugar you were given. The blood samples will be sent to the laboratory and the results are usually available within a day or two.

Can I drink water before glucose test?

You should eat your normal diet prior to the day of testing. Do not eat, drink, smoke, or exercise for at least 8-12 hours before your first blood sample is taken. You may drink plain water but no other beverages. This test may take up to four hours to complete.

How common is it to fail the first glucose test?

It doesn’t necessarily mean you have gestational diabetes. “This is just a screening test, and nearly 25 percent of patients fail this initial test,” says Pope.

Can stress cause you to fail glucose test?

Yes, both physical and emotional stress can impact blood sugar and make it unpredictable.

What is the difference between OGTT and GTT?

The Glucose Tolerance Test (GTT), also referred to as the Oral Glucose Tolerance Test (OGTT), is a method which can help to diagnose instances of diabetes mellitus or insulin resistance. The test is a more substantial indicator of diabetes than finger prick testing.

How do you make a 75g glucose drink?

In the glucose tolerance test, 75 g of glucose are dissolved in 250 to 300 ml of water. The amount given to children is based on their body weight. If the test is being done to confirm suspected diabetes, blood is drawn again after two hours and the blood sugar level is measured.

How do I pass my 2 hour glucose test?

Avoid sugars and refined carbs
Don’t eat high-sugar foods or simple carbs (including refined grains) the morning of your glucose screening. The body breaks these foods down quickly, leading to a spike in blood sugar levels. That means avoiding foods such as: Orange juice and other fruit juices.

What happens if you fail the 2 hour glucose test?

If you fail the glucose tolerance test and are diagnosed with gestational diabetes, you’ll work with your provider or a diabetes specialist, and possibly a nutritionist. Together you’ll come up with a treatment plan, which will cover: Strategies for managing gestational diabetes. Diet for gestational diabetes.

What is a 2 hour glucose tolerance test?

What is a normal 2 hour glucose tolerance test?

Normal Response: A person is said to have a normal response when the 2-hour glucose level is less than or equal to 110 mg/dL. Impaired Fasting Glucose: When a person has a fasting glucose equal to or greater than 110 and less than 126 mg/dL, they are said to have impaired fasting glucose.

Can I drink water during my GTT?

Preparing for your test
You will need to fast the evening before the test. From this time, do not eat or drink (water is permitted but do not drink tea, coffee, or cordial) until the test is finished the following day. Do not smoke during the fasting period.

Do you get glucose test results same day?

Some will give you results the next day, but others can take up to a week, Dr. Greves says. Most of the time, a normal result for the glucose screening test is a blood sugar that is equal to or less than 140 mg/dL one hour after drinking the sweet beverage, MedlinePlus says.

Can I brush my teeth before a glucose test?

You should have nothing to eat or drink (other than water) for 8-10 hours before the test. The morning of the test, you can brush your teeth, and you can take medications with small sips of water.

Is it normal to feel sick after glucose test?

Some women may feel nauseated, sweaty, or lightheaded after they drink the glucose solution. Serious side effects from this test are very uncommon.

Can you drink water during glucose test?

Since activity can affect test results, you will be asked to sit quietly during the entire test. Do not eat during the test. You may drink water during this time.