As radioactivity crosses the placental barrier from mother to foetus, the next generation are being directly affected.

The results show that the placental barrier prevents HIV transmission, irrespective of whether HIV enters the placenta or not.

We conclude that LMW heparin does not cross the placental barrier, and in addition offers satisfactory antithrombotic protection for both maternal and placental circulation.

Review: Treatment decisions are difficult, since medications may cross the placental barrier and potentially affect fetal growth and organogenesis, or even result in fetal bradyarrhythmias.