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What happens if your glucose test is high during pregnancy

Author

Sarah Cherry

Published Mar 27, 2026

If your blood glucose level is elevated (above normal) at least once during the test, your doctor will tell you that you have gestational diabetes. To reduce the risk of diabetes-related problems for you and your baby, follow your doctor’s instructions.

What happens if sugar level is high during pregnancy?

High blood glucose levels during pregnancy can also increase the chance that your baby will be born too early, weigh too much, or have breathing problems or low blood glucose right after birth. High blood glucose also can increase the chance that you will have a miscarriage link or a stillborn baby.

Is it common to fail the 1 hour glucose test?

Odds of passing. The truth about this test is that the one-hour test is pretty easy to “fail,” and many people do! They make the threshold low enough so that they catch anyone who could be having an issue, just in case. The levels on the three-hour test are much more reasonable and easier to meet.

What does it mean if you fail your glucose test while pregnant?

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.

Can the glucose test harm my baby?

This can lead to the following complications: high blood glucose in the fetus and low levels after birth. difficulties during labor and the need for a cesarian delivery. a higher risk of vaginal tearing during the birth and bleeding after delivery.

Is gestational diabetes a high risk pregnancy?

Women who develop diabetes during pregnancy, known as gestational diabetes mellitus (GDM), may need high-risk pregnancy care due to complications that can arise during pregnancy and childbirth. Women with GDM have an increased risk of preeclampsia, a condition that leads to pregnancy-induced high blood pressure.

Can your baby get diabetes if you have gestational diabetes?

Babies of mothers who have gestational diabetes have a higher risk of developing obesity and type 2 diabetes later in life. Stillbirth. Untreated gestational diabetes can result in a baby’s death either before or shortly after birth.

Can I refuse the glucose test when pregnant?

Yes, you can decline a glucose screening or test, but opting out is not recommended. Since most women with gestational diabetes don’t have any symptoms, getting tested may be the only way to find out if you have the condition. Gestational diabetes puts you and your baby at risk of complications.

How early do you deliver with gestational diabetes?

Giving birth The ideal time to give birth if you have gestational diabetes is usually around weeks 38 to 40. If your blood sugar is within normal levels and there are no concerns about your or your baby’s health, you may be able to wait for labour to start naturally.

Can drinking lots of water affect a glucose test?

Drinking water before a fasting blood sugar test can actually decrease blood sugar levels, or at least prevent levels from getting too high. Water allows more glucose to be flushed out of the blood.

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What should I not eat the night before my glucose test?

DO NOT eat or drink anything except WATER for at least 8 hours before the test. You may drink plain water ONLY. Do NOT drink coffee, tea, soda (regular or diet) or any other beverages. Do NOT smoke, chew gum (regular or sugar-free) or exercise.

What should I eat for breakfast before my pregnancy glucose test?

Eat a meal low in carbohydrates before this test. Example of foods to eat for breakfast would be eggs, cheese, bacon and or sausage. Avoid breads, cereals and fruit juices. Example of foods for lunch would be lettuce/salad with any kind of meat.

Does gestational diabetes go away?

For most women with gestational diabetes, the diabetes goes away soon after delivery. When it does not go away, the diabetes is called type 2 diabetes. Even if the diabetes does go away after the baby is born, half of all women who had gestational diabetes develop type 2 diabetes later.

Can you refuse treatment for gestational diabetes?

Pregnancy is not an exception to the principle that a decisionally capable patient has the right to refuse treatment, even treatment needed to maintain life. Therefore, a decisionally capable pregnant woman’s decision to refuse recommended medical or surgical interventions should be respected.

What should my blood sugar be 2 hours after eating while pregnant?

The American College of Obstetricians and Gynecologists (ACOG) says you should try to keep your blood sugar above 70 mg/dL and below these levels: Before meals: 95 mg/dL or lower. 1 hour after eating: 130 mg/dL or lower. 2 hours after eating: 120 mg/dL or lower.

What birth defects can be caused by gestational diabetes?

  • Cesarean birth (also called c-section). …
  • High blood pressure and preeclampsia. …
  • Macrosomia. …
  • Perinatal depression. …
  • Premature birth. …
  • Shoulder dystocia or other birth injuries (also called birth trauma). …
  • Stillbirth.

What birth defects are caused by diabetes?

Among the defects in children born to women with diabetes are heart problems, brain and spinal defects, oral clefts, kidney and gastrointestinal tract defects, and limb deficiencies. Diabetes diagnosed before pregnancy was linked with about 50% of the birth defect categories analyzed.

How can I control gestational diabetes in my third trimester?

Gestational diabetes can be treated with diet, lifestyle changes, and medicines, in some instances. Your doctor will recommend dietary changes, such as decreasing your carbohydrate intake and increasing fruits and veggies. Adding low-impact exercise can also help. In some instances, your doctor may prescribe insulin.

When should I worry about gestational diabetes?

They’ll likely diagnose you with gestational diabetes if you have any of the following blood sugar values : fasting blood sugar level greater than or equal to 92 milligrams per deciliter (mg/dL) 1-hour blood sugar level greater than or equal to 180 mg/dL. 2-hour blood sugar level greater than or equal to 153 mg/dL.

Does gestational diabetes affect baby movement?

With gestational diabetes there is a higher risk of early placenta deterioration. One of the possible symptoms of having issues with the placenta is a decrease or change in baby’s movements.

Can you have a normal size baby with gestational diabetes?

The research involved 202 women who were controlling their gestational diabetes with diet, and found their babies on average were slightly smaller compared to healthy pregnant women in the control group. Lead researcher Dr Fatima Vally said the results were very exciting.

Does gestational diabetes mean more ultrasounds?

Extra scans These scans are important because gestational diabetes can cause the baby to grow larger than usual (known as macrosomia). This can cause complications in labour and giving birth. The team will need to check your baby’s size regularly and will talk to you about the best options for the birth of your baby.

How do you pass the glucose test when pregnant?

DO NOT eat or drink anything (other than sips of water) for 8 to 14 hours before your test. (You also cannot eat during the test.) You will be asked to drink a liquid that contains glucose, 100 grams (g) . You will have blood drawn before you drink the liquid, and again 3 more times every 60 minutes after you drink it.

Can you get a false positive gestational diabetes test?

As with most screening tests, a false-positive diagnosis of gestational diabetes is of course possible. Research suggests this may be more common when gestational diabetes is diagnosed earlier in pregnancy with a glucose tolerance test [GTT]​2,3​.

Can blood glucose rise without eating?

Caution: Sleep For some people, blood sugar can rise in the morning — even before breakfast — due to changes in hormones or a drop in insulin.

Can dehydration cause high sugar levels?

Dehydration—less water in your body means a higher blood sugar concentration. Nose spray—some have chemicals that trigger your liver to make more blood sugar.

What foods trigger insulin?

  • sugary drinks, such as soda, juices, and sports drinks.
  • processed foods and baked goods, which often contain trans fats.
  • white rice, bread, and pasta.
  • breakfast cereals with added sugar.
  • yogurts with added sugar.
  • honey and maple syrup.

Does eating sweets the day before 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.

Can I drink water before glucose blood test pregnancy?

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

What number do you need to pass glucose test?

Blood sugar level below 140 mg/dL is normal and considered passing. (Note that some doctors use a threshold of 130 mg/dL) Blood sugar level between 140 mg/dL and 190 mg/dL is elevated, and requires the follow-up three-hour glucose tolerance test to confirm gestational diabetes.

How long do you fast for glucose test?

Glucose tests, which measure blood sugar. One type of glucose test is called a glucose tolerance test. For this test you will need to fast for 8 hours before test.