Gestational Diabetes
When Is Insulin Needed in Gestational Diabetes?
Written by Dr. Ajay V. Kaduskar, Diabetologist, Nagpur
MD (Medicine), PGDHSc (Diabetology), FEACD (The Netherlands)
Published · 4 min read
Quick answer
Insulin is needed in gestational diabetes when blood sugars stay above target despite 1 to 2 weeks of proper diet and activity, or when sugars are very high at diagnosis. Insulin does not cross the placenta in significant amounts and is considered safe for the baby. Roughly one in three women with gestational diabetes may need medicine, and many can stop after delivery.
Many women feel anxious when told they may need insulin in pregnancy. It can feel like a setback. In reality, insulin is a safe and effective way to protect you and your baby when diet and activity are not enough.
What are the blood sugar targets?
Targets are usually:
-
Fasting: below 95 mg/dL
-
1 hour after meals: below 140 mg/dL
-
2 hours after meals: below 120 mg/dL
Your doctor may adjust them. If more than a few readings in a week are above target despite good diet and activity, treatment is stepped up.
When do doctors start insulin?
-
Persistently high readings: Fasting or post-meal sugars remain above target after one to two weeks of lifestyle changes.
-
Very high sugar at diagnosis: For example, a fasting value well above the normal range.
-
Signs of excess growth: A baby measuring large on scan, especially with a large abdomen, or excess amniotic fluid.
-
Ketones despite adequate diet: Which suggests the need for better control.
-
Pre-existing diabetes: Diagnosed in early pregnancy.
Why is insulin preferred?
-
It does not cross the placenta in meaningful amounts.
-
It is effective at lowering sugars in pregnancy.
-
The dose can be adjusted easily.
-
It has a long safety record.
What about tablets?
Metformin is used in some centres, and sometimes glibenclamide. These cross the placenta to some extent, and long-term effects on children are still being studied. Guidelines differ by country, and the decision is individual. Your doctor will explain the pros and cons.
How is insulin given?
-
Small injections with a pen and a very fine needle, usually into the abdomen or thigh.
-
Basal insulin (long-acting): At bedtime or morning, to control fasting sugars.
-
Rapid-acting insulin: Before meals, to control post-meal peaks.
-
Doses start low and are adjusted every few days based on your sugar diary.
What are the risks?
The main risk is low blood sugar (hypoglycaemia). Symptoms include shakiness, sweating, hunger, headache and palpitations. Treat with fast sugar such as glucose or fruit juice, then a snack, and inform your doctor. Weight gain can also occur, but it is usually modest.
Is insulin safe for the baby?
Yes. Good sugar control reduces the risks of a very large baby, birth injury, early delivery, newborn low sugar and breathing problems. Not using insulin when it is needed carries greater risk than using it.
Will you need insulin after delivery?
In most women with gestational diabetes, insulin is stopped right after delivery, as the placental hormones that cause insulin resistance disappear. Your sugar is checked after birth and again at six to twelve weeks to find out whether diabetes persists.
How can you reduce the chance of needing insulin?
-
Follow the meal plan and do not skip meals.
-
Walk for 10 to 15 minutes after meals.
-
Monitor your sugar as advised.
-
Manage sleep and stress.
-
Keep appointments.
Even with perfect habits, some women need insulin because of their hormones. It is not a failure.
When should you see a doctor?
Contact your doctor if readings are above target, you feel faint or sweaty, you have repeated lows, you vomit often or you notice decreased baby movements.
Points to keep
-
Insulin is added when diet and activity do not keep sugars in range.
-
It is safe for the baby and effective.
-
Dose adjustments are based on your sugar diary.
-
Watch for low blood sugar and know how to treat it.
-
Insulin is usually stopped after delivery.
Needing insulin does not mean you did something wrong. It means your body needs extra help during pregnancy. For caring, personalised guidance, consult Dr. Ajay V. Kaduskar, a diabetologist at Niramay Clinics in Nagpur.
Sources and further reading
Frequently asked questions
When sugars remain above target after one to two weeks of diet and activity, when readings are very high at diagnosis, or when scans show excess growth of the baby.
Yes. Insulin does not cross the placenta significantly and has a long safety record. Good sugar control with insulin lowers risks for the baby.
Usually not. Most women stop insulin after delivery. You will have a sugar test after birth and again at six to twelve weeks to see whether diabetes continues.
Some doctors use metformin or other tablets. They cross the placenta to some extent, and guidelines vary. Discuss the options with your doctor.
It depends on your readings. Some women need one dose at bedtime for fasting sugars, others need doses before meals. Your doctor will tailor it.
Take 15 g of fast sugar such as glucose tablets or half a cup of juice, recheck in 15 minutes and have a snack. Inform your doctor so the dose can be adjusted.
Related reading
- Full guide: gestational diabetes
- Gestational Diabetes Test: When and What Results Mean
- Gestational Diabetes Diet: Indian Foods and Meal Timing
- Does Gestational Diabetes Go Away After Delivery?
- CGM in Pregnancy: When It Helps and What to Know
- After Gestational Diabetes: When to Test for Type 2
If you would like advice suited to your own reports and medicines, you can book an appointment or visit Niramay Clinics in Dhantoli, Nagpur.
Related services
More from the Health Library
Ready to talk to a specialist?
Call 0712 2422214 or +91 84591 41584, message us on WhatsApp, or use the appointment form. Please bring your previous reports and a list of the medicines you take.