Gestational diabetes mellitus (GDM) is a common pregnancy condition that affects how the body processes glucose, leading to higher-than-normal blood sugar levels during pregnancy. While it can feel overwhelming to receive a diagnosis, gestational diabetes is manageable with early screening, proper care, and lifestyle adjustments. Understanding the risks of gestational diabetes during pregnancy helps protect both mother and baby and supports a safer pregnancy journey.
In Australia, gestational diabetes is one of the fastest-growing forms of diabetes, affecting around one in eight pregnancies, particularly women aged 15 to 49. Without appropriate management, gestational diabetes increases the risk of pregnancy complications, delivery challenges, and long-term health concerns for both mother and child.
What Is Gestational Diabetes?
Gestational diabetes is a form of diabetes that develops during pregnancy when the body cannot use insulin effectively. Insulin is a hormone produced by the pancreas that helps move glucose from the bloodstream into the cells for energy. During pregnancy, hormones produced by the placenta support the baby’s growth but also interfere with insulin action. This process is known as insulin resistance.
On Insulin Resistance
When insulin resistance occurs, the pancreas must produce two to three times more insulin to maintain normal blood glucose levels. If the pancreas cannot keep up with this increased demand, blood sugar levels rise, resulting in gestational diabetes. GDM usually develops between 24 and 28 weeks of pregnancy, although it can appear earlier in women with higher risk factors.
If gestational diabetes is not identified and managed, it can lead to serious complications for both mother and baby. However, with early diagnosis and proper treatment, most women with GDM go on to have healthy pregnancies and deliveries.
How Common Is Gestational Diabetes in Australia?
According to Diabetes Australia, gestational diabetes is the fastest-growing type of diabetes in the country. National data shows that approximately 18% of women who gave birth between 2021 and 2022 were diagnosed with gestational diabetes. The condition affects thousands of pregnancies each year, including those in metropolitan areas such as Adelaide CBD.
The rising prevalence is linked to factors such as increasing maternal age, higher rates of overweight and obesity, and changes in lifestyle patterns. Due to the fact that many women experience few or no symptoms, routine screening plays a vital role in early detection.
Who Is at Risk of Developing Gestational Diabetes?
Any pregnant woman can develop gestational diabetes, but certain factors increase the risk. Women at higher risk include those who:
- Had gestational diabetes in a previous pregnancy
- Have a family history of type 2 diabetes
- Are aged 40 years or over
- Have a first-degree relative (mother or sister) who had GDM
- Are overweight or obese
- Previously had elevated blood glucose levels
- Are First Nations women
- Have African, Melanesian, Polynesian, South Asian, Chinese, Southeast Asian, Middle Eastern, Hispanic, or South American backgrounds
- Have polycystic ovary syndrome (PCOS)
- Previously gave birth to a baby weighing more than 4.5 kg
- Take certain medications, such as corticosteroids or antipsychotics
Having one or more risk factors does not guarantee gestational diabetes will occur, but it does increase the likelihood and highlights the importance of early screening.
Causes of Gestational Diabetes
There is no single cause of gestational diabetes, and not all women with risk factors will develop the condition. The primary cause is pregnancy-related insulin resistance, driven by hormonal changes from the placenta.
Less common causes include underlying medical conditions such as Cushing’s syndrome or PCOS, as well as medications that affect glucose metabolism. Regardless of the cause, the outcome is the same. It is elevated blood glucose levels that require monitoring and management throughout pregnancy.
Normal Blood Glucose Levels During Pregnancy
Blood glucose targets during pregnancy are slightly different from those outside pregnancy. In Australia:
- Early pregnancy: blood glucose levels are generally between 4 and 5 mmol/L
- Later pregnancy: levels typically range between 5 and 6 mmol/L
Maintaining blood sugar levels within these ranges helps reduce the risk of complications for both mother and baby.
Screening and Diagnosis of Gestational Diabetes
Routine screening is essential because gestational diabetes often presents with mild or no symptoms.
Glucose Challenge Test
This initial screening test involves drinking a sugary solution, followed by a blood glucose test one hour later. If the result is higher than 7.8 mmol/L, further testing is required.
Oral Glucose Tolerance Test (OGTT)
The follow-up test involves consuming a higher-glucose drink, with blood sugar levels measured over three hours. If two or more readings are elevated, gestational diabetes is diagnosed.
Early screening allows healthcare providers to begin management strategies promptly, reducing pregnancy risks.
Warning Signs and Symptoms of Gestational Diabetes
Some women may experience symptoms, while others may not notice any changes. Possible warning signs include:
- Extreme thirst
- Frequent urination
- Sugar detected in urine tests
- Blurred vision
- Ongoing fatigue
- Nausea
- Recurrent infections (urinary, vaginal, or skin)
Since symptoms can be subtle, attending regular antenatal appointments and screening tests is crucial. Learning first aid skills can also help families respond confidently to emergencies related to blood sugar fluctuations during pregnancy.
Health Risks to the Mother
If gestational diabetes is left untreated or poorly managed, it can lead to several pregnancy complications.
High Blood Pressure and Pre-eclampsia
Women with GDM are at increased risk of developing hypertension and pre-eclampsia — a serious pregnancy complication characterised by high blood pressure, protein in the urine, and potential seizures. This condition can be life-threatening for both mother and baby.
Increased Likelihood of Caesarean Section
Due to complications such as large baby size or labour difficulties, women with gestational diabetes are more likely to require a caesarean section.
Future Type 2 Diabetes
Gestational diabetes significantly increases the risk of developing type 2 diabetes later in life. The condition is also more likely to recur in future pregnancies.
Health Risks to the Baby
Gestational diabetes can also affect the baby’s health before, during, and after birth.
Macrosomia and Birth Trauma
High maternal blood sugar can cause the baby to grow larger than average (macrosomia), increasing the risk of shoulder dystocia, birth injuries, and delivery complications.
Hypoglycaemia
After birth, babies may experience low blood sugar levels, which can be harmful if not treated promptly.
Jaundice
Some babies develop jaundice, where the skin and eyes appear yellow, often due to immature liver function.
Respiratory Distress Syndrome
Babies born to mothers with GDM may experience breathing difficulties, particularly if born early. Close monitoring during pregnancy and after delivery helps reduce these risks.
Prevention and Management of Gestational Diabetes
While gestational diabetes cannot always be prevented, effective management significantly reduces complications.
Healthy Eating
Dietary changes are often the most effective way to manage blood sugar levels. This includes eating small, frequent meals, choosing high-fibre foods, limiting sugary foods, and avoiding refined carbohydrates such as white bread and pasta.
Regular Exercise
Moderate physical activity, such as walking or swimming, helps improve insulin sensitivity and control blood glucose levels. Exercise plans should always be discussed with a healthcare provider.
Weight Management
Gaining weight within recommended pregnancy guidelines helps lower insulin resistance and reduces complications.
Medication and Insulin Therapy
If lifestyle changes are not enough, insulin may be prescribed. Insulin is safe during pregnancy and effectively controls blood glucose levels.
Regular blood glucose monitoring using a home glucometer is essential, along with ongoing antenatal check-ups.
What to Expect in a CPR First Aid Course
First aid training provides practical skills to manage emergencies related to pregnancy and blood sugar imbalances, such as hypoglycaemia. Partners, caregivers, and colleagues can learn how to recognise warning signs, provide immediate support, and respond confidently until medical help arrives.
Courses covering pregnancy and newborn first aid, childcare first aid, and CPR offer valuable knowledge that supports safer outcomes for both mother and baby.
FAQs About Gestational Diabetes
Can gestational diabetes be prevented?
It cannot always be prevented, but maintaining a healthy weight, eating well, and staying active before and during pregnancy may reduce risk.
Does gestational diabetes go away after birth?
In most cases, blood sugar levels return to normal after delivery. However, ongoing screening is important.
Will I develop diabetes later in life?
Women who have had GDM have a higher risk of type 2 diabetes and should undergo regular follow-up testing.
Can my baby be healthy if I have gestational diabetes?
Yes. With proper management, most women with GDM have healthy babies and uncomplicated deliveries.
Conclusion
Gestational diabetes is a common but manageable condition that carries real pregnancy risks if left untreated. Early screening, consistent monitoring, healthy lifestyle choices, and appropriate medical care significantly reduce complications for both mother and baby. Women who have experienced gestational diabetes should continue regular health checks after pregnancy to monitor for type 2 diabetes and cardiovascular risk factors.
Learning first aid and emergency response skills adds another layer of safety, empowering families and caregivers to respond effectively if complications arise during pregnancy or after birth.