![]() ![]() How is placenta praevia diagnosed?Ī low-lying placenta is checked for during your routine 20-week ultrasound scan. Your baby may need to be born by caesarean because the placenta may block the birth canal, preventing a vaginal birth. Bleeding from placenta praevia can be very heavy, sometimes putting both your and your baby’s life at risk. There is a risk that you may have vaginal bleeding, particularly towards the end of the pregnancy, because the placenta is low down in your uterus. Placenta praevia is more common if you have had one or more previous caesarean births, if you have had fertility treatment in order to fall pregnant, or if you smoke. This condition is known as low-lying placenta if the placenta is less than 20 mm from the cervix or as placenta praevia if the placenta completely covers the cervix. For some women, the placenta continues to lie in the lower part of the uterus as the pregnancy continues. ![]() In most cases, the placenta moves upwards and out of the way as the uterus grows during pregnancy. In some women, the placenta attaches low down in the uterus and may cover part of or all of the cervix (the neck of the womb). ![]() The placenta is delivered shortly after the baby is born and it is sometimes called the afterbirth. Oxygen and nutrients pass from your blood through the placenta into your baby’s blood. It attaches to the wall of your uterus and provides a connection between you and your baby. The placenta develops together with the baby in your uterus during pregnancy. If you have any concerns or require further explanation after reading it, please discuss this with your healthcare team. It is not intended to replace discussion with your healthcare team, but may act as a starting point. This leaflet has been produced to give you general information and answer most of your questions. It may also be helpful if you are a partner, relative or friend of someone in this situation. It also includes information on vasa praevia. This information is for you if you have placenta praevia (a low-lying placenta after 20 weeks of pregnancy) or placenta accreta (when the placenta is stuck to the muscle of your womb). Need some help choosing a language? Please refer to Browsealoud Supported Voices and Languages. You can translate this page by using the headphones button (bottom left) and then select the globe to change the language of the page. ![]()
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