Long and Short-haul flights when pregnant
In theory, flying, especially long-haul, may be a risk factor for deep vein thrombosis
(DVT) because of the associated enforced prolonged sitting down. This in some cases
might be associated with reduced fluid intake leading to dehydration which is an
independent risk factor for DVT. Some experts therefore argue that a flier would
negate any perceived increased risk of thrombosis associated with flying by avoiding
those two issues. This is why it is advocated for all passengers (not only the pregnant)
to make regular stretching exercises and walk about in the cabin and ensure regular
fluid intake. For pregnant women, pressure stockings may also aid circulation in
the lower limbs.
What role Aspirin?
Low-dose Aspirin for a flier is widely recommended but this remains controversial.
Aspirin is an anti-platelet agent which is of proven value in preventing arterial
thrombosis (such as for people with or at risk of coronary heart disease or angina).
Deep vein thrombosis occurs through an entirely different mechanism and therefore
Aspirin is unlikely to be of any value in preventing this. It is, nonetheless, still
advised by a number of bodies for people planning to fly.
Latest stage of pregnancy to fly
Airlines have different rules regarding the upper limit beyond which they would not
allow a pregnant woman to fly. As a general guide, almost all airlines decline to
fly women beyond 36 weeks of gestation and for some it is 34 weeks. In the phase
between 28 and 36 weeks, most airlines will demand that the passenger bring her doctor’s
letter stating that she is fit to fly and that she is unlikely to go into labor within
36 hours.
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