Antenatal shared care: the GP's role in Australian pregnancy management

Antenatal shared care is a collaborative model of pregnancy management in which the GP, community midwife, and obstetrician each contribute according to clinical need and risk level. In Australia, the Australian Pregnancy Care Guidelines published by the Department of Health and RANZCOG standards frame the evidence base; the RACGP shared antenatal care framework defines the GP’s specific role in routine low-risk and moderately elevated risk pregnancies.

Australia has approximately 300,000 births per year. Gestational diabetes affects roughly 15% of pregnancies (rising with increasing rates of obesity and older maternal age), pre-eclampsia around 5%, and preterm birth around 7%. Maternal mortality at approximately 6 per 100,000 is among the lowest globally, but Aboriginal and Torres Strait Islander women experience rates two to three times higher — making targeted, culturally safe care essential.

Most uncomplicated pregnancies follow a standard GP-led schedule: every four weeks to 28 weeks, fortnightly to 36 weeks, then weekly until birth. High-risk pregnancies require earlier and more frequent specialist involvement.

A. Core clinical — the AU general-practice framework

The first visit (ideally before 10 weeks)

The first antenatal visit is the most comprehensive consultation in pregnancy and should ideally occur before ten weeks. Per the Australian Pregnancy Care Guidelines:

History:

• Confirm LMP, calculate estimated due date, gravidity and parity
• Previous obstetric history: mode of delivery, complications, birth weight, Caesarean reasons
• Medical and surgical history: hypertension, diabetes, thyroid disease, autoimmune conditions, mental health, asthma, IBD
• Psychiatric history: prior depression, anxiety, postnatal depression, psychosis, eating disorders
• Drug review: flag teratogens — warfarin, ACE inhibitors, ARBs, statins, methotrexate, retinoids, lithium — plan safe alternatives
• Social history: partner, housing, finances, employment, support network, substance use, domestic violence
• Family history: diabetes, hypertension, genetic conditions, neural tube defects, hereditary cancers
• Ethnicity and refugee or migration status (additional screening implications)

Booking blood tests:

• FBC [item 65070] — haemoglobin, platelets, red cell indices
• Blood group and antibody screen [item 65096 range]
• Syphilis serology [item 69405 range]
• Hepatitis B surface antigen, hepatitis C antibody, HIV antibody
• Rubella IgG — if non-immune, vaccinate postpartum (MMR is a live vaccine, contraindicated in pregnancy)
• Varicella IgG — same principle
• Ferritin [item 66599] — iron stores
• Vitamin D [item 66608] — deficiency common, particularly in winter and in women who cover skin
• TSH [item 66716] — thyroid function
• HbA1c — for women with significant diabetes risk at booking
• Urine microscopy, culture, and sensitivity — treat asymptomatic bacteriuria in pregnancy

Genetic screening offer:

• Combined first-trimester screening (CFTS): nuchal translucency measurement, PAPP-A and free βhCG at 11 to 13 weeks and six days — screens for Down syndrome and other chromosomal conditions
• Non-invasive prenatal testing (NIPT): Medicare-rebatable item 73310 for high-risk indications (positive CFTS, prior aneuploidy, age ≥40, multiple pregnancy); private cost approximately $400 in average-risk women
• Carrier screening: cystic fibrosis, fragile X, spinal muscular atrophy, and expanded panels — Medicare-rebatable for selected couples since 2023 [item 73456]
• Dating ultrasound: 6 to 10 weeks — confirms gestational age, singleton or multiple, location

Routine visit schedule and investigations

18 to 20 weeks — morphology ultrasound: structural anomaly survey, fetal cardiac four-chamber view, placental location.

24 to 28 weeks — 75 g oral glucose tolerance test for gestational diabetes; Edinburgh Postnatal Depression Scale; FBC and antibody screen (Rh-negative women); blood pressure and urinalysis at every visit.

28 weeks — Anti-D 625 IU intramuscularly for all Rh-D negative women, supplied through Australian Red Cross Lifeblood; repeat antibody screen.

34 to 36 weeks — group B streptococcus (GBS) vaginal and rectal swab per state policy; growth scan if clinically indicated (fundal height measurement guides this).

Vaccinations in pregnancy (per Australian Immunisation Handbook):

• Influenza — any trimester; NIP-funded
• dTpa (Boostrix) — 20 to 32 weeks every pregnancy for pertussis passive immunity transfer to the newborn
• COVID-19 booster — per current ATAGI advice
• Maternal RSV vaccine (Abrysvo) — 28 to 36 weeks; introduced in Australia 2024–2025, providing passive immunity to the newborn against severe RSV illness
• Avoid live vaccines — MMR, varicella, BCG, yellow fever; administer postpartum if seronegative

Lifestyle counselling

• Folic acid 0.5 mg daily from pre-conception to 12 weeks; 5 mg daily if prior neural tube defect, type 1 or 2 diabetes, anti-epileptic drugs, BMI ≥30, family history of neural tube defects
• Iodine 150 mcg daily throughout pregnancy and lactation — supports fetal brain development; per NHMRC iodine guidance
• No alcohol — fetal alcohol spectrum disorder has no safe dose threshold
• Smoking cessation — NRT is the preferred pharmacological support; avoid varenicline and bupropion in pregnancy; see the eTG for safe cessation support
• Exercise — ≥150 minutes per week of moderate-intensity activity; pelvic floor exercises from first trimester
• Diet safety: avoid listeria-risk foods (deli meats, soft cheeses, pâté, raw seafood, sushi, sprouts); avoid high-mercury fish (shark, swordfish, marlin, orange roughy); limit caffeine to ≤200 mg per day
• Vitamin D 1000 to 2000 IU daily if deficient; dietary calcium 1000 to 1300 mg per day

B. Evidence appraisal — key clinical decisions in shared antenatal care

Aspirin for pre-eclampsia prevention

The ASPRE trial (NEJM 2017) — using a combined first-trimester screening algorithm (maternal factors, uterine artery Doppler, PAPP-A, mean arterial pressure) — demonstrated that aspirin 150 mg from 12 weeks reduces preterm pre-eclampsia by approximately 62% in screen-positive high-risk women. Current Australian practice, aligned with RANZCOG and the Pregnancy Care Guidelines, recommends aspirin 100 to 150 mg daily from 12 weeks for clinical high-risk criteria: prior pre-eclampsia, type 1 or 2 diabetes, chronic hypertension, autoimmune conditions (SLE, antiphospholipid syndrome), multiple pregnancy, BMI ≥35, ART pregnancy, age ≥40, primigravida over 35, or family history of pre-eclampsia. Aspirin is continued to 36 to 37 weeks.

NIPT vs CFTS — how to counsel

Both tests detect chromosomal aneuploidy but serve different roles. CFTS (11 to 13+6 weeks: NT + PAPP-A + free βhCG) gives a numerical risk that guides further testing. NIPT on cell-free fetal DNA has higher sensitivity and specificity for Down syndrome. NIPT does not replace morphology ultrasound for structural anomalies. For average-risk women, CFTS is the Medicare-funded standard pathway; NIPT is available privately (~$400) and is Medicare-rebatable for high-risk criteria. Counsel that NIPT is a screening test — a positive result requires diagnostic confirmation by CVS or amniocentesis.

Gestational diabetes management

GDM is diagnosed by the 75 g OGTT at 24 to 28 weeks using Australian Diabetes in Pregnancy Society criteria (fasting ≥5.1 mmol/L, 1-hour ≥10.0, 2-hour ≥8.5 mmol/L). First-line management is dietary modification and structured physical activity. If fasting glucose remains above 5.0 to 5.3 mmol/L or postprandial levels exceed targets, metformin or insulin (commonly rapid-acting NovoRapid with meals) is added per the AMH. A follow-up 75 g OGTT at six to twelve weeks postpartum screens for transition to type 2 diabetes or persistent impaired glucose tolerance.

C. Common antenatal conditions managed in general practice

Hyperemesis gravidarum: IV fluid rehydration; pyridoxine plus doxylamine (Diclectin) as first-line antiemetic per eTG; ondansetron in the second and third trimesters (a modest first-trimester cardiac signal prompts caution before 10 weeks); metoclopramide as alternative; thiamine for prolonged severe cases (Wernicke’s encephalopathy risk). Hospitalisation for electrolyte correction and rehydration when oral intake is unsustainable.

Urinary tract infection: Treat symptomatic UTI and asymptomatic bacteriuria in pregnancy — both carry risks of preterm labour and pyelonephritis. Preferred agents per sensitivity: cefalexin, nitrofurantoin (avoid near term — risk of neonatal haemolytic anaemia), amoxicillin. Avoid trimethoprim in the first trimester (folate antagonism), and avoid fluoroquinolones entirely. Per AMH, culture-directed therapy is standard.

Iron deficiency anaemia: Oral iron (ferrous sulfate or ferrous gluconate) first-line; IV ferric carboxymaltose for severe anaemia or oral intolerance. Target ferritin above 30 mcg/L.

Mental health: Edinburgh Postnatal Depression Scale at booking, 28 weeks, and 6 weeks postnatal. PANDA 1300 726 306 for perinatal mental health support. 1800RESPECT 1800 737 732 for domestic and family violence — routine private inquiry at each visit is best practice.

D. Australian operations

MBS items relevant to general practice in antenatal care:

• Standard consultations: items 3, 23, 36, 44 — bulk-billed for most pregnancy care
• Pregnancy support counselling: item 4001 — three sessions per pregnancy for counselling on lifestyle, psychosocial issues, domestic violence, and relationships
• NIPT: item 73310 — rebatable for high-risk indications only
• Mental Health Care Plan: items 2700 and 2701 — for perinatal depression, anxiety, or eating disorder relapse
• GPCCMP: items 965 and 967 — applicable when a pregnant woman has a pre-existing chronic condition (diabetes, hypertension, epilepsy, thyroid disease, IBD); replaced former items 721/723/732 from 1 July 2025
• ATSI Health Assessment: item 715 — applicable during pregnancy; higher-risk maternal and perinatal outcomes require enhanced assessment

PBS: Folic acid, iodine supplements, and vitamin D are available on general schedule or over the counter. Anti-D immunoglobulin is not a PBS item — it is supplied through Australian Red Cross Lifeblood. Antiemetics, insulin, and metformin for GDM are general schedule.

MotherSafe (mothersafe.org.au) provides specialist telephone advice on medication safety in pregnancy and lactation — 1800 647 848 (NSW; state equivalents available).

E. Special populations

ATSI Australians — Aboriginal and Torres Strait Islander women have two to three times the maternal mortality of non-Indigenous women. Aboriginal Maternal Services, Birthing on Country programmes, and Aboriginal Community Controlled Health Organisations provide culturally safe care. The ATSI Health Assessment item 715 is applicable in pregnancy. Additional screening: sexually transmissible infections, pneumococcal vaccination, and parasite screening depending on geographic area and risk.

Refugee and migrant women — may arrive without prior antenatal screening. Offer catch-up booking bloods, cervical screening if due, tuberculosis screening (Mantoux) depending on country of origin, and HPV vaccination if eligible. Language access services and interpreter support are essential.

High-risk pregnancies — women with pre-existing type 1 or 2 diabetes, hypertension, autoimmune disease, prior severe obstetric complication, multiple pregnancy, or advanced maternal age require shared care with an obstetrician from booking. Multidisciplinary clinics (diabetes-in-pregnancy, perinatal mental health, perinatal addiction) manage complex intersecting needs.

Postnatal review at 6 weeks — essential touchpoint for physical recovery, mental health (EPDS), contraception, breastfeeding, infant development, vaccination status, and follow-up OGTT if GDM occurred. This visit is frequently undervalued relative to its clinical importance.

When to escalate

Escalate urgently — present to ED or call 000 — for:

• Pre-eclampsia features: BP ≥140/90 after 20 weeks with proteinuria, severe headache, visual changes, epigastric pain, or oedema progressing rapidly
• Antepartum haemorrhage: any heavy bleeding after 20 weeks — placenta praevia, abruption, or vasa praevia
• Reduced fetal movements at ≥28 weeks — same-day assessment; do not wait
• Suspected ectopic pregnancy — pain, bleeding, positive test, before 12 weeks — urgent TVS
• Severe hyperemesis with electrolyte disturbance or ketosis
• Preterm labour or suspected membrane rupture before 37 weeks
• Mental health crisis or suicidal ideation — refer to emergency mental health services

Refer same-week for:

• New diagnosis of pre-eclampsia, GDM, fetal growth restriction, placenta praevia
• Fetal anomaly on ultrasound requiring counselling, further investigation, or tertiary unit input
• Newly suspected pre-existing medical condition detected during pregnancy

What this article is and is not

This is general health information drawn from the Australian Pregnancy Care Guidelines, RANZCOG, Australian Immunisation Handbook, eTG, and AMH. It is not personal medical advice and does not create a doctor–patient relationship. Pregnancy care is individualised — decisions about medications, timing, and investigations are made with your own GP, midwife, and specialist.

For Australian consumer resources: HealthDirect — Pregnancy, Pregnancy, Birth and Baby 1800 882 436, PANDA 1300 726 306, 1800RESPECT 1800 737 732, MotherSafe 1800 647 848.

For acute pregnancy emergency — call 000 or present to the nearest emergency department with obstetric services.

---

Sources cited

1. Australian Pregnancy Care Guidelines
2. RANZCOG
3. RACGP
4. Australian Immunisation Handbook
5. NHMRC — iodine supplementation
6. eTG
7. AMH
8. ASPRE trial (NEJM 2017)
9. PBS
10. HealthDirect — Pregnancy
11. Pregnancy, Birth and Baby
12. PANDA
13. 1800RESPECT
14. MotherSafe
15. Australian Red Cross Lifeblood