Gestational Diabetes: Improving Postpartum Glucose Testing Compliance

Gestational diabetes usually settles after birth, but the future risk does not disappear with the delivery of the baby. Women who have had hyperglycaemia during pregnancy have a higher chance of developing type 2 diabetes, recurrent gestational diabetes and cardiovascular risk factors. Postpartum glucose testing is the key opportunity to identify that risk early.

In Australia, the recommended follow-up test is generally a 75 g oral glucose tolerance test (OGTT), completed around six to twelve weeks after birth. The test includes a fasting blood sample and a second sample two hours after drinking a glucose solution. A normal result still requires ongoing checks because diabetes risk can increase over time.

The difficulty is getting from a written recommendation to a completed test. New parents may be recovering from birth, breastfeeding, arranging childcare and attending immunisation or maternal and child health appointments. A pathology referral can easily be misplaced among discharge papers, especially when a woman feels well and the pregnancy-related diagnosis seems to have ended.

Improving compliance therefore requires more than reminding women to attend. Hospitals, general practices, diabetes educators, pathology providers and community services need a coordinated pathway that makes testing understandable, affordable and convenient. The experience of perinatal medicine in Australia is grounded in this kind of communication between disciplines, a focus also reflected in the archived FAOPS congress site, which documented scientific work in perinatal and neonatal care.

Why Postpartum Testing Matters

Gestational diabetes is caused by increased insulin resistance during pregnancy. After the placenta is delivered, insulin sensitivity often improves, yet some women continue to have impaired glucose regulation. An abnormal postpartum OGTT may reveal impaired fasting glucose, impaired glucose tolerance or previously unrecognised type 2 diabetes.

The result also helps shape future care. A woman with a normal test can receive advice about regular screening, healthy eating, activity and another pregnancy. Someone with an abnormal result may need a GP review, diabetes education, additional blood tests or referral to an endocrinologist. Identifying diabetes early can reduce the chance that symptoms are missed for years.

Postpartum testing has value beyond an individual appointment. It gives maternity and primary care services information about whether their gestational diabetes program is reaching women after discharge. Low completion rates can indicate problems with referral processes, patient education, pathology access or communication between a hospital and local GP clinics.

What Compliance Means In Practice

Compliance should be understood as a completed, clinically appropriate test within the recommended timeframe, rather than simply a pathology form being issued. A woman may be told to arrange testing, receive a referral and still be recorded as “non-compliant” if the result never reaches the maternity service. Reliable measurement should include referral, attendance, result capture and follow-up.

The OGTT can be inconvenient. It requires fasting, usually takes about two hours at the pathology collection centre and may be difficult for a breastfeeding mother who has no support with her baby. Some collection centres have limited opening hours, and local rules may differ about whether infants can remain with their mothers during the test.

Australian health services also need to account for cost and access. Medicare may cover many pathology services, but out-of-pocket charges can still occur depending on the provider and circumstances. Women in outer metropolitan areas, regional towns or remote communities may face long travel distances, limited public transport or fewer appointment times than someone living near central Melbourne or Sydney.

Australian Recommendations And Timing

Australian clinical practice commonly recommends a 75 g OGTT at six to twelve weeks after birth for women with gestational diabetes. The exact timing may be recorded differently by state, hospital or professional body, so the discharge plan should state a clear target date and explain how the test is booked. A fasting plasma glucose may be used in some circumstances, but it does not provide the same information as the full OGTT.

HbA1c is not usually the preferred stand-alone test in the early postpartum period. Recent blood loss, iron deficiency and the changing physiology after pregnancy can affect its reliability. It may become useful later, according to the woman’s clinical situation, but the initial assessment should follow the advice of her treating team.

A normal postpartum result does not mean screening can stop. Australian guidance generally supports repeat diabetes screening every one to three years, with earlier assessment if symptoms or additional risk factors develop. A future pregnancy should begin with early glucose assessment because gestational diabetes can recur, particularly after a previous affected pregnancy.

Why Attendance Falls Away

The weeks after birth are full of competing demands. A woman may be managing caesarean recovery, pelvic floor symptoms, sleep deprivation, feeding difficulties or postnatal anxiety while also caring for a newborn. If she was never given a simple explanation of why the test matters, “come back in six to twelve weeks” can feel less urgent than immediate family needs.

Language and culture influence attendance as well. Aboriginal and Torres Strait Islander women may experience fragmented care, transport barriers or a lack of culturally safe services. Women from migrant communities may need interpreters or written information in a preferred language. Some families may be unfamiliar with the term “oral glucose tolerance test” or may assume that feeling healthy means testing is unnecessary.

Practical details also create missed opportunities. A woman might move from an obstetric clinic to a GP, change address, return to work or travel to stay with relatives. Rural and remote patients may need to coordinate pathology with a town visit. If responsibility for follow-up is unclear, each service may assume another service is tracking the result.

Designing Better Follow-Up Pathways

The pathway should begin before discharge. The maternity team can explain the purpose of the OGTT, provide the recommended date range, check whether the woman has a regular GP and give instructions about fasting, medications and breastfeeding. Using plain language such as “a diabetes check after your baby is born” can be more effective than relying on an acronym alone.

A referral should be sent electronically where possible, with a copy given to the patient. The hospital record can generate a reminder for the woman and a task for the GP practice. A text message, phone call or patient portal notification near the due date is more useful when it includes the location, expected duration and booking instructions rather than a generic reminder.

The six-week postnatal visit is a practical checkpoint, but it should not be the only one. General practices can review whether the OGTT has been completed, arrange another referral if needed and document the result in the patient’s long-term record. Maternal and child health nurses, diabetes educators and community Aboriginal health workers can reinforce the message when they already have contact with the family.

Interpreting Results And Future Risk

The postpartum OGTT should be interpreted using the laboratory and guideline criteria supplied by the treating clinician. A result in the diabetes range needs prompt follow-up and confirmation where clinically appropriate. Impaired glucose tolerance or impaired fasting glucose indicates elevated future risk even when immediate diabetes is not diagnosed.

Follow-up should be practical rather than alarmist. Advice may include gradual return to physical activity when medically safe, nutritious meals that suit the family’s budget and culture, weight management where appropriate, and attention to blood pressure and lipid levels. Breastfeeding may support maternal metabolic health, although it should never be presented as a substitute for glucose testing.

The next pregnancy is another important stage. A woman with previous gestational diabetes should tell her GP, midwife or obstetric team early. Preconception planning, early glucose testing and timely antenatal review can help identify recurrent hyperglycaemia sooner. Clear documentation prevents the history from being lost when care moves between a private obstetrician, public hospital and community GP.

Building A Reliable Service Response

Health services can improve completion rates by auditing each step. Useful measures include the percentage of eligible women who receive a referral before discharge, attend an OGTT within the target period, have results returned to the maternity service and receive documented advice about long-term screening. Reviewing results by location, language, socioeconomic circumstances and Aboriginal or Torres Strait Islander status can expose inequities hidden by an overall average.

The best model is flexible. A metropolitan service may offer several pathology locations and electronic reminders, while a regional service may coordinate testing with scheduled appointments or outreach clinics. Practices should avoid labelling women as careless when the system has provided unclear instructions, an inaccessible appointment or no active follow-up.

A short, consistent message across services can make a substantial difference: gestational diabetes often improves after birth, but diabetes risk remains; the OGTT is time-limited; and the result guides future care. Staff should check understanding using a respectful conversation, with interpreters and culturally appropriate resources whenever needed.

A practical comparison of common follow-up approaches is below:

Improving postpartum glucose testing compliance is a shared responsibility across maternity care and primary care. Hospitals can make the plan clear, GPs can close the loop, pathology services can reduce practical barriers, and families can receive support that fits real life after birth.

For Australian services, the immediate priority is to review every woman’s discharge pathway: Was the OGTT explained? Was a referral issued? Is the result visible to the GP? Has someone followed up when testing was missed? Turning those questions into a routine process can protect long-term health well beyond the postnatal period.