What are the pregnant lady sugar range?

Answer by Dr. Albana Greca, MD, MMedSc

Hi Sandeep,

The correct range depends on whether you are asking about daily home-monitoring goals or the laboratory thresholds used to diagnose gestational diabetes.

Daily Blood Sugar Goals During Pregnancy

For many pregnant people with gestational diabetes or preexisting diabetes, commonly recommended glucose goals are:

• Fasting or before breakfast: below 95 mg/dL (5.3 mmol/L);


• One hour after the start of a meal: below 140 mg/dL (7.8 mmol/L);


• Two hours after the start of a meal: below 120 mg/dL (6.7 mmol/L).

Your maternity team may individualize these goals according to the type of diabetes, treatment, risk of low glucose and pregnancy history. Our gestational diabetes overview explains why pregnancy uses tighter glucose targets.

How Gestational Diabetes Is Diagnosed

Testing is usually performed between 24 and 28 weeks. Some clinics begin with a nonfasting 50-gram glucose challenge test and check glucose one hour later. If the screening result reaches the clinic's cutoff—often 130, 135 or 140 mg/dL—a longer fasting oral glucose tolerance test may be needed.

Other clinics use a one-step fasting 75-gram oral glucose tolerance test. Gestational diabetes is diagnosed when any one of these values is reached or exceeded:

• Fasting: 92 mg/dL (5.1 mmol/L);


• One hour: 180 mg/dL (10.0 mmol/L);


• Two hours: 153 mg/dL (8.5 mmol/L).

The screening and diagnostic methods are compared in our guide to the gestational diabetes test.

What About HbA1c?

HbA1c may be used as additional information, especially in someone who had diabetes before pregnancy, but it is not the standard test for diagnosing gestational diabetes at 24–28 weeks. Pregnancy changes red-cell turnover, so HbA1c may be lower and less informative than fasting and after-meal glucose readings.

When diabetes is already present, an HbA1c below 6% may be ideal if it can be achieved without significant hypoglycemia. The goal can be relaxed when necessary for safety.

When Is Glucose Too Low?

A blood glucose reading below 70 mg/dL (3.9 mmol/L) is generally considered low. Anyone using insulin or medicine that can cause hypoglycemia should have a treatment plan. Repeated low readings, fainting, confusion or inability to swallow require prompt medical attention.

What Should a Pregnant Woman Do?

• Confirm whether the reading was fasting, one hour after eating or two hours after eating.


• Follow the targets given by the obstetric or diabetes team.


• Do not severely restrict food or carbohydrate to force lower readings.


• Record repeated high or low values and report the pattern.


• Complete the recommended pregnancy glucose test even if there are no symptoms.

If gestational diabetes is confirmed, management usually begins with an individualized eating plan, appropriate activity and home glucose monitoring. Insulin or another treatment may be needed when targets are not reached, as explained in our gestational diabetes treatment guide.

My Advice

Use pregnancy-specific targets rather than the usual ranges for nonpregnant adults. The commonly used goals are fasting below 95 mg/dL, one hour after eating below 140 mg/dL and two hours after eating below 120 mg/dL, unless the maternity team gives different individualized targets.

Hope this helps.

Dr. Albana Greca

Related Questions

• Is Fasting Blood Sugar of 100 High During Pregnancy?


• Can Gestational Diabetes Occur With Normal Home Readings?


• Can Gestational Diabetes Be Prevented in Another Pregnancy?

Related Resources

• Gestational Diabetes Test


• Gestational Diabetes: Symptoms and Control


• Treatment for Gestational Diabetes

References

• ADA Standards of Care 2026: Diabetes in Pregnancy


• ADA Standards of Care 2026: Gestational Diabetes Diagnosis


• NIDDK: Tests and Diagnosis for Gestational Diabetes