Clinical overview
"Can I travel?" is one of the commonest questions a pregnant woman asks, and it is a deceptively rich consultation. The answer is almost never a flat yes or no — it is a structured, individualised risk assessment that the FCOG candidate must be able to deliver fluently in clinic. The verb in this objective is advise, and the examiner will reward a candidate who can take a generic worry and turn it into specific, defensible counselling: the right gestation to travel, the venous-thromboembolism (VTE) precautions appropriate to this woman's risk profile, the malaria and other infectious risks of her destination, the seatbelt and hydration advice for the journey itself, and — crucially — a plan for what she does if something goes wrong far from her booked facility.
For the South African registrar, travel counselling is not an abstract exercise in low-risk lifestyle medicine. South Africa has a high background burden of HIV, anaemia, hypertensive disease and obstetric haemorrhage; women travel long distances by minibus taxi and bus to visit family over December and Easter, often into provinces with seasonal malaria transmission (Limpopo, Mpumalanga lowveld, northern KwaZulu-Natal) or across borders into high-transmission southern African countries. The same woman who asks about a flight to London may equally be planning a 1,200-km road trip to the Eastern Cape over the festive season, delivering her not into a tertiary unit but into a district hospital or community health centre many hours from referral. Good advice therefore weds the international evidence to the realities of the South African health system, its levels of care and its referral pathways. This chapter is framed around delivering that advice safely and comprehensively.
Core knowledge
The two dominant physiological hazards of travel
Two pregnancy physiology changes drive most travel-specific risk and should anchor your reasoning.
1. Hypercoagulability and venous stasis. Pregnancy is a prothrombotic state: rising fibrinogen, factors VII/VIII/X and von Willebrand factor, falling protein S, and acquired activated-protein-C resistance, compounded by venous distensibility and mechanical compression of the iliac veins by the gravid uterus. VTE is among the leading direct causes of maternal death in well-resourced settings, and the risk is elevated antepartum and markedly so postpartum. Prolonged immobility — the defining feature of long-haul flights and long road or rail journeys — adds venous stasis on top of this baseline, so the absolute VTE risk of travel, while small per trip, is meaningfully raised in pregnancy compared with the non-pregnant traveller. Any journey involving more than roughly four hours of immobility is conventionally treated as a "long-distance" trip for counselling purposes (standard teaching; flag as a working threshold, not a hard cut-off).
2. Reduced physiological reserve for hypoxia and dehydration. Commercial aircraft cabins are pressurised to an equivalent altitude of roughly 1,800–2,400 m, lowering inspired oxygen and producing a modest fall in maternal arterial oxygen saturation. A healthy pregnant woman with a normal haemoglobin tolerates this without fetal compromise. A woman with significant anaemia, sickle cell disease, severe pre-eclampsia, significant cardiorespiratory disease, or a growth-restricted/compromised fetus has less reserve, and this is where caution sharpens. Low cabin humidity, immobility and reduced fluid intake also promote dehydration, which aggravates both venous stasis and (theoretically) uterine irritability.
Gestational windows
There is broad, long-standing consensus — reflected in airline policy rather than a single trial — on when travel is most comfortable and lowest-risk:
- First trimester: travel is generally safe, but nausea, vomiting and fatigue are at their worst, and the background miscarriage rate is highest, so an early-pregnancy event abroad is not uncommon and is distressing far from home. This is reasoning to share, not a prohibition.
- Second trimester (roughly 14–28 weeks): the conventional "best window" — the woman feels well, the early-pregnancy risks have passed, and she is not yet near the threshold for preterm complications.
- Third trimester: the practical constraint becomes the destination's distance from obstetric care and airline cut-offs. Most airlines restrict flying in late pregnancy: as a rough guide, many carriers allow uncomplicated singleton travel up to about 36 weeks and multiple pregnancies to about 32 weeks, often requiring a doctor's letter from around 28 weeks. These are airline policies, not clinical guidelines — always tell the woman to confirm with her specific carrier, and document that you did. (Flag: these week thresholds are industry-standard guidance, not from a verified clinical guideline.)
Destination-specific infectious risk
The destination, not just the journey, matters. For the South African and broader African traveller the dominant concern is malaria. Plasmodium falciparum malaria in pregnancy is more frequent, more severe and more often complicated (severe maternal anaemia, hypoglycaemia, cerebral malaria, miscarriage, stillbirth, preterm birth, low birthweight) than in the non-pregnant adult, and pregnant women are an at-risk group in whom prevention is a priority. Travel into malaria-endemic areas in pregnancy should be actively discouraged where it can be deferred, and where unavoidable, rigorous prevention is mandatory. Other destination considerations include the local burden of arboviral infection (Zika and its association with congenital abnormality is the textbook example), the food- and water-borne enteric risks of traveller's diarrhoea, and the availability of vaccination — which links to vaccines-in-pregnancy.
Assessment
The whole consultation is a risk stratification. Work through it systematically; this is exactly the structure an examiner wants to hear.
Figure I8.1 — Travel triage dashboard for deciding whether a pregnant traveller can go, needs optimisation, or should defer non-essential travel.
Characterise the trip
- Mode and duration: flight versus road/rail/sea; total hours of immobility; single long-haul leg versus multiple shorter legs.
- Destination: malaria/arbovirus endemicity and season; altitude; standard of available medical and obstetric care; distance from a facility able to manage her foreseeable complications; whether she crosses a border (affecting medical-aid cover and access).
- Timing in pregnancy and the expected gestation at the outbound and return dates (a trip safe at departure may breach airline limits or approach term on the way back).
- Purpose and flexibility: is the travel deferrable? Festive-season family visits often are; compassionate or essential travel may not be.
Characterise the woman (risk factors that change the advice)
- VTE risk: previous VTE, known thrombophilia, obesity, age >35, parity ≥3, smoking, gross varicose veins, current medical comorbidity, immobility — these stack. Assess her formally using the same VTE risk framework you would apply antenatally (see high-risk-pregnancy-risks); the RCOG VTE risk-assessment approach (Green-top Guideline 37a) is the reference for scoring and pharmacological prophylaxis.
- Obstetric risk: multiple pregnancy, history of preterm birth, cervical insufficiency, placenta praevia or other APH risk, hypertensive disease or pre-eclampsia, fetal growth restriction or other fetal compromise — these raise the stakes of being far from care.
- Medical comorbidity: significant anaemia, sickle cell disease, cardiorespiratory disease, poorly controlled diabetes, and HIV status and treatment — a woman on antiretrovirals must carry a sufficient supply and not interrupt therapy; drug interactions matter when malaria chemoprophylaxis or treatment is added (see hiv-in-pregnancy).
- Logistics: does she have the doctor's letter the airline will require? Does she have her antenatal records/handheld card to show clinicians at her destination? Does she know where the nearest appropriate facility is?
Examination and investigations
For a well woman this is the routine antenatal assessment with travel in mind: blood pressure, symphysis–fundal height, and confirmation that the pregnancy is appropriately monitored for gestation. Where she is travelling to a malaria area, a documented baseline haemoglobin is sensible given the anaemia risk. There is no battery of "travel investigations"; the value is in matching the assessment to the identified risks rather than over-testing the low-risk traveller.
Management
The deliverable of this objective is clear, individualised, documented advice. Organise it the way you will actually say it to the woman.
General advice for every pregnant traveller
- Choose the window: prefer the second trimester for non-essential long trips; counsel on airline cut-offs and the need to confirm with the carrier and to carry a doctor's letter and antenatal records.
- Travel insurance / cover: ensure it explicitly covers pregnancy, premature delivery and neonatal care; this is often excluded or capped — for cross-border travel and the uninsured, the cost of an obstetric emergency abroad can be catastrophic.
- Carry documentation: antenatal handheld record, blood group and rhesus status, medication list, and the contact details of her booking facility.
- Plan for the worst case: identify, before leaving, where she would go if she bled, leaked liquor, had reduced fetal movements, or went into labour. For domestic travel this means knowing the nearest hospital with maternity services and its level of care.
VTE prevention on the journey
This is the single most important journey-specific intervention and must be explicit:
- Mobilise: walk the aisle/stop the car regularly and do calf exercises hourly while seated.
- Hydrate and avoid excess caffeine and alcohol (the latter being separately contraindicated in pregnancy).
- Graduated compression stockings (properly fitted) for journeys over roughly four hours.
- Pharmacological thromboprophylaxis with low-molecular-weight heparin is reserved for women whose overall risk warrants it on formal assessment (e.g. previous VTE, thrombophilia, multiple stacking risk factors) — not given routinely to every traveller. Use the RCOG GTG 37a framework to decide and to dose by weight; aspirin is not adequate VTE prophylaxis here.
In-flight and in-transit specifics
- Seatbelt worn at all times, the lap belt placed below the bump, low across the hips/upper thighs, with the diagonal sash between the breasts and to the side of the bump — this applies to both car and aircraft. Correct seatbelt placement is also the headline message of any trauma-in-pregnancy discussion.
- Cabin radiation and airport security scanners pose no meaningful fetal risk for the occasional traveller.
- Advise against travel to high altitude destinations involving exertion at altitude for the unacclimatised pregnant woman.
Figure I8.2 — Long-journey safety bundle linking pregnancy VTE physiology, universal mobility and hydration measures, risk-assessed LMWH, and correct seatbelt placement.
Malaria prevention (high-yield for SA)
Where travel to an endemic area cannot be deferred:
- Bite avoidance is foundational: insecticide-treated nets, long sleeves/trousers at dusk, and DEET-containing repellents (considered acceptable in pregnancy).
- Chemoprophylaxis must follow current national/destination guidance for the specific area and trimester, because agent choice is restricted in pregnancy and resistance patterns vary; confirm the regimen against the current authoritative source rather than from memory. (Flag: the safe-in-pregnancy chemoprophylaxis agent and its trimester restrictions are area- and policy-dependent — verify against current SA NDoH/destination malaria guidance before prescribing; not specified in the verified-sources list.)
- Have a low threshold for testing: any fever during or after travel to an endemic area is malaria until proven otherwise, and the woman must be told to seek care urgently and to mention her travel.
South African system context
Make the advice concrete to the SA setting. Counsel the woman that within South Africa her safety net is the district → regional → tertiary referral chain, and that long road travel over the festive season can place her hours from the regional or tertiary unit that would manage a serious complication — so a woman with a high-risk pregnancy (high-risk-pregnancy-risks) should think hard about deferring. Reinforce that obstetric haemorrhage and hypertensive disease are among the leading causes of maternal death in the Saving Mothers (NCCEMD) reports, and that several of these deaths are associated with delays in reaching definitive care — distance compounds the "three delays." Confirm she will not interrupt antiretroviral therapy and carries enough supply for the whole trip plus a margin. All of this counselling, and the woman's decision, should be documented in the notes.
Emergency advice the woman must leave with — the unmistakable drill
Tell her, in plain language, to stop and get to the nearest hospital immediately — and to phone ahead if she can — if any of the following happen while travelling:
- Vaginal bleeding of any amount.
- A gush or persistent leaking of fluid (possible ruptured membranes).
- Regular painful contractions / labour before her due date.
- Reduced or absent fetal movements (see decreased-fetal-movements).
- Severe headache, visual disturbance, epigastric pain or sudden swelling (possible pre-eclampsia).
- Calf pain/swelling, chest pain or breathlessness (possible VTE/pulmonary embolism — a medical emergency).
- Fever, especially after a malaria-area visit (malaria until proven otherwise).
She should carry her antenatal record so that whoever sees her can act quickly, and she must not "wait until she gets home."
Figure I8.3 — Malaria and emergency-drill infographic for South African travel: defer endemic-area trips where possible, use bite avoidance and verified prophylaxis when unavoidable, plan referral access, and stop travel for red flags.
Red flags / pitfalls
- Giving blanket reassurance without risk-stratifying. "You'll be fine" to a woman with previous VTE, a multiple pregnancy, or a malaria-area destination is unsafe advice. Always individualise.
- Forgetting VTE prophylaxis on long journeys — or, conversely, prescribing LMWH to every traveller. The discipline is a formal risk assessment (RCOG GTG 37a), with stockings/mobilisation/hydration for everyone and LMWH only for those whose score warrants it.
- Not warning explicitly about malaria for African travel, or relying on chemoprophylaxis recalled from memory when agent safety is trimester- and area-dependent. Verify, and emphasise bite avoidance.
- Ignoring the return leg gestation and airline cut-offs — a woman cleared to fly out may be stranded near term on the way back.
- Travel insurance gaps — failing to flag that many policies exclude pregnancy/neonatal care leaves a family exposed to ruinous cost.
- Treating a febrile returning traveller as a simple viral illness — missing falciparum malaria in a pregnant woman can be fatal within days.
- Not documenting the advice and the woman's informed decision, especially when she chooses to travel against advice.
- Overlooking the high-risk pregnancy for whom the correct advice is to defer non-essential travel rather than to optimise it.
Evidence anchors
- South African National Integrated Maternal and Perinatal Care Guideline (NDoH, 2024) — the SA obstetric source of truth for risk-based antenatal care, levels of care and referral pathways underpinning travel counselling.
- Saving Mothers / NCCEMD (latest triennium) — obstetric haemorrhage and hypertensive disease among leading maternal-death causes; the "delays" framework relevant to travel away from definitive care.
- RCOG Green-top Guideline 37a — Reducing the Risk of Venous Thromboembolism in Pregnancy and the Puerperium — the reference for VTE risk assessment and pharmacological thromboprophylaxis decisions that govern long-distance travel advice.
- South African National HIV / ART Consolidated Guidelines (2023) and the 2023 SAHCS Adult ART Guidelines — uninterrupted ART supply and drug-interaction awareness for travelling women living with HIV.
- NICE NG201 — Antenatal Care — framework for the routine antenatal risk assessment within which travel advice sits.
- Note: gestational airline cut-offs (≈36 weeks singleton, ≈32 weeks multiple), the ~4-hour "long journey" VTE threshold, cabin-altitude oxygen figures, and specific malaria chemoprophylaxis agents are standard travel-medicine/airline teaching rather than items line-itemed in the verified-sources list; they are stated cautiously and should be confirmed against the woman's airline and current destination malaria guidance before prescribing.