What does it mean to have a low placenta
Low-lying placenta (placenta praevia) | Tommy's
Is a low-lying placenta common?
The position of your placenta will be checked at your mid-trimester ultrasound scan, at around 18-21 weeks of pregnancy. If your placenta is low-lying, you have another scan later in your pregnancy (usually about 32 weeks).
Because the lower part of the womb stretches more as the baby grows, the placenta usually moves into the upper part of the womb by this point. 90% of women who have a low-lying placenta at 20 weeks will not go on to have a low-lying placenta later in the pregnancy.
If you have had a baby by caesarean section before, the placenta is less likely to move upwards.
Only 1 in every 200 women have placenta praevia at the end of their pregnancy.
Am I likely to have placenta praevia?
Placenta praevia is more likely if you:
- smoke cigarettes
- have had fertility treatment to get pregnant, such as in vitro fertilisation (IVF)
- have had 1 or more caesarean sections
- are aged 40 or older
- are having more than 1 baby
- have had surgery on the womb
- are a cocaine user
- are expecting a boy
- have endometriosis.
Is there anything I can do to help the placenta move up?
Unfortunately not. The best thing you can do is concentrate on staying as healthy as you can. You may need extra scans, so make sure you go to all your antenatal appointments and follow your healthcare professional’s advice.
How can placenta praevia affect me and my baby?
There is a risk that you may have vaginal bleeding, particularly towards the end of your pregnancy. Bleeding from placenta praevia may be very heavy and can sometimes put mum and baby at risk.
How is a low-lying placenta diagnosed?
Your midwife or doctor will look at your placenta’s position at your 18 to 21 week ultrasound scan.
If your placenta is low, you'll be offered an extra ultrasound scan later in your pregnancy (usually at about 32 weeks) to check its position again.
In 90% of cases, the placenta is no longer low-lying by this point.
Your midwife or doctor may think you have placenta praevia if:
- you have bleeding during the second or third trimester – this is usually painless and may happen after sex
- if the baby is lying in an unusual position, for example bottom first (breech) or lying across the womb (transverse)
If you have any bleeding during pregnancy, with or without pain, you should always get checked out straight away.
If you’re in your first trimester, contact your doctor, midwife or Early Pregnancy Unit. If you are more than 12 weeks pregnant, go to your local A&E or contact your hospital maternity unit immediately.
You may be advised to avoid having sex (including the use of penetrative sex toys) for the rest of your pregnancy.
What treatment will I have?
Extra scans
If your placenta is low-lying at your 20-week scan, you’ll be offered another ultrasound scan at around 32 weeks. This may include a transvaginal ultrasound scan, which is when a probe is gently placed inside the vagina to check exactly where your placenta is lying. Don’t worry, this is safe for you and your baby.
The length of your cervix may also be measured at your 32-week scan to predict whether you may go into labour early and whether you are at increased risk of bleeding.
If the placenta hasn’t moved up, you should be offered another ultrasound scan at 36 weeks. The results of this scan will help you and your doctor plan the safest way for you to give birth.
Medication
If you have placental praevia, there is a risk you may give birth prematurely. So you may be offered a course of steroid injections between 34 and 36 weeks of pregnancy to help your baby’s lungs to become more mature.
If you do go into labour early, you may be offered medication to try to stop your contractions. This will give you time to have a course of steroid injections. If you have severe bleeding or progressing labour your baby may need to be delivered.
If you have vaginal bleeding, you may need to be admitted to hospital. This is because there is a small risk that you could bleed suddenly and heavily. If this happens, you may need an emergency caesarean section.
What do I need to do if I have a low-lying placenta?
If you know you have a low-lying placenta, you should contact the hospital immediately if you have:
- vaginal bleeding, including spotting
- contractions
- pain, including any vague, period-like aches.
If you have any bleeding, your doctor may need to do an internal examination to check where it’s coming from. This is safe and they will ask for your permission before they start.
Anaemia
Anaemia is a blood condition that develops when you don’t have enough red blood cells. Red blood cells contain haemoglobin, a protein that carries oxygen around your body and to your baby.
If you have a low-lying placenta, it’s important to try to avoid developing anaemia, which can be common in pregnancy. Eating a healthy, balanced diet will help you either prevent or manage anaemia. Iron supplements may also help, if your healthcare team recommends them.
How will my baby be born?
Your healthcare team will talk to you about what your options are for giving birth.
You may be advised to give birth early if you have any heavy bleeding before your due date.
If the edge of your placenta is very close (less than 20mm) to your cervix (entrance to the womb), the Royal College of Obstetricians and Gynaecologists state that the safest way to give birth is by caesarean section.
This will usually be between 36 and 37 weeks. Your doctor will discuss your options with you, but how you give birth is ultimately your decision. But if you have had vaginal bleeding during your pregnancy, you may be advised to have your caesarean earlier than this.
If the placenta is further than 20mm from your cervix, you may be able to have a vaginal birth if you want one.
If you are having a caesarean section, a senior obstetrician (a doctor who specialises in pregnancy) will be there. This is because you may have heavy bleeding during the surgery. If this happens, you may need a blood transfusion. This is more likely if you have placenta praevia.
Talk to your doctor before your surgery if, for any reason, you do not want a blood transfusion.
Unfortunately, complications are more common in caesarean sections if you have a low-lying placenta. Your doctor should talk to you about the risks of major bleeding and hysterectomy (removal of the womb) before your caesarean.
For most women, the risk of hysterectomy is low and will only occur as a last resort if other measures to control bleeding are not effective.
If you have placenta praevia:
- you are at higher risk of having your baby early (less than 37 weeks).
- your baby will need to be born by caesarean section because the placenta is blocking the birth canal.
Your mental health
Being diagnosed with complications in pregnancy can be hard. And being asked to look out for certain symptoms, such as bleeding, and needing extra appointments and check-ups can cause anxiety and stress. It may also be a lonely experience when those around you don’t understand what it’s like.
Remember that you can tell your midwife or doctor how you feel. They will do their best to reassure you and answer any questions you may have.
You can also call our pregnancy line on 0800 014 7800 (Monday to Friday, 9am to 5pm), or email us at [email protected]
If you are struggling to cope, there is professional support available.
Don’t suffer in silence. Tell your midwife or GP how you feel. They will help you access the support you need.
Find out more about looking after our mental health in pregnancy.
What complications can affect the placenta?
Complications that can affect the placenta during pregnancy or childbirth include:
- low-lying placenta and placenta praevia
- retained placenta – when part of the placenta remains in the womb after giving birth
- placental abruption – when the placenta starts to come away from the wall of the womb
These complications aren't common.
Low-lying placenta and placenta praevia
As your pregnancy progresses, your womb expands and this affects the placenta's position. The area where the placenta is attached usually stretches upwards, away from your cervix.
If the placenta stays low in your womb, near to or covering your cervix, it may block the baby's way out.
This is called low-lying placenta if the placenta is less than 2cm from the cervix, or placenta praevia if the placenta is completely covering the cervix.
Placenta praevia, where the cervix is completely covered at the end of pregnancy, affects about 1 in every 200 births.
The position of your placenta will be recorded at your 18- to 21-week ultrasound scan.
If your placenta is significantly low, you'll be offered an extra ultrasound scan later in your pregnancy (usually at about 32 weeks) to check its position again.
For 9 in every 10 women, the placenta will have moved into the upper part of the womb by this point.
If the placenta is still low in your womb, there's a higher chance that you could bleed during your pregnancy or during your baby's birth.
This bleeding can be very heavy and put you and your baby at risk.
You may be advised to come into hospital at the end of your pregnancy so emergency treatment (such as a blood transfusion) can be given very quickly if you bleed.
If the placenta is near or covering the cervix, your baby can't be delivered through the vagina, so a caesarean section will be recommended.
A low-lying placenta can be associated with painless, bright red bleeding from the vagina during the last 3 months of pregnancy. If this happens to you, contact your midwife or GP immediately.
Retained placenta
After your baby's born, part of the placenta or membranes can remain in the womb. This is known as retained placenta. If untreated, a retained placenta can cause life-threatening bleeding.
Breastfeeding your baby as soon as possible after the birth can help your womb contract and push the placenta out.
Your midwife may also ask you to change your position (for example, by moving to a sitting or squatting position). In some cases, you may be given an injection of a medicine to help your womb contract.
If these methods don't work, a doctor may need to remove the placenta by hand. This can be painful, so you'll be given an anaesthetic.
Placental abruption
Placental abruption is a serious condition in which the placenta starts to come away from the inside of the womb wall.
It can cause stomach pain, bleeding from the vagina and frequent contractions.
It can also affect the baby, increasing the risk of premature birth, growth problems and stillbirth.
It's not clear what causes placental abruption, but factors that increase the risk include injury to the abdominal area, smoking, cocaine use and high blood pressure.
If you're near your due date, the baby will need to be born straight away and a caesarean section may be recommended.
But if the baby's very premature and the abruption is minor, you may be kept in hospital for close observation.
Always speak to your midwife or GP if you're concerned about any aspect of your health when you're pregnant. You can also call NHS 111.
Further information
- Vaginal bleeding in pregnancy
- Antenatal care
Page last reviewed: 22 August 2022
Next review due: 22 August 2025
Low placenta
Home / Gynecologist / Low placenta
Placenta is a temporary organ that is formed in the body of a pregnant woman in order to maintain a connection between her body and the fetus.
She filters the blood , which the unborn baby feeds on, cleansing it of toxins and other harmful substances.
This pathology can be very dangerous in some cases, while in others it goes away without any treatment and does not bring problems. nine0003
Types of location of the placenta
Usually the placenta is attached to the posterior wall of the uterus closer to its bottom . It is worth noting that the uterus is an inverted vessel, and its bottom is located on top. This is the best option for the location of the placenta. However, this does not always work out. In some cases, the placenta is attached to the anterior wall. Which is also not a pathology.
The low position of the placenta during pregnancy is much more dangerous. If the placenta is located low, it is subjected to stronger pressure from the fetus, and even with any external influence, the risk is damage to the placenta or its detachment increases.
In addition, in the later stages, an actively moving baby can also damage the placenta, or squeeze the umbilical cord.
A placenta is said to be low when there is less than 6 cm between its lower edge and the os of the uterus. The anterior wall has a greater tendency to stretch, and migration is also characteristic of it, however, the direction of migration is opposite: usually the placenta moves in the opposite direction, down to the cervix. nine0003
An even more complex and dangerous pathology of the location of the placenta is its partial or complete presentation . Previa is a condition when the placenta partially or completely obscures the cervix of the uterus.
Causes of low placenta
Many causes of low placenta are due to internal factors - diseases during pregnancy and the condition of the female genital organs . They can be:
- damage to the mucous membrane of the uterus;
- inflammatory processes;
- infections;
- previous abortions;
- miscarriages in the past;
- cesarean section;
- various gynecological operations;
- pathology of the structure, development, functioning of the uterus;
- multiple pregnancy;
- unhealthy lifestyle: active smoking, excessive alcohol consumption;
- previous diseases of the uterus: endometritis, fibroids; nine0044
- parity - many births in the past;
- the woman's age is over 35 years.
Curettage of the uterus in the past is the main cause of this pathology. Damage to the mucosa prevents the fetal egg from gaining a foothold in the upper segment of this organ, and it remains below, at the neck.
Symptoms of low placenta
The danger of this pathology is that it practically does not manifest itself. Usually, signs that not everything is in order with the placenta are the result of already running and irreversible processes - for example, its detachment. It can be:
- drawing pains, feeling of heaviness in the abdomen;
- bloody discharge with a low location of the placenta is an alarm signal that it is necessary to call an ambulance;
- freezing of the fetus in the womb for a long time, or, conversely, its too violent activity - this is caused by hypoxia;
- on ultrasound with such a pathology in 50% of cases is the wrong presentation of the fetus;
- in 30% of cases, women suffer from severe toxicosis.
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A pregnant woman herself cannot suspect that she has a low placenta. This can only be seen on planned ultrasounds, which must be passed by everyone. After an ultrasound examination, they can not only clarify or refute the diagnosis, but also determine the type of pathology.
Treatment and prevention of low placentation
Management of pregnancy with low placentation is always very careful. A woman will have to undergo ultrasound many times, limit physical activity and stop sexual activity. For a long time, increased uterine tone can provoke detachment of an improperly located placenta, from there bleeding, and possible death of the fetus as a result of acute hypoxia, if placental abruption is large. Bleeding can even provoke a gynecological examination of the cervix, therefore, for no particular reason, doctors try not to conduct examinations on the chair. nine0003
Listen to the doctors and hope for the best. Many women give birth on their own or by caesarean section of healthy babies with low placenta previa.
If you need help from an experienced gynecologist, sign up for a consultation by calling 8 (49244) 9-32-49, 8 (910) 174-77-72.
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What are placenta anomalies? 
1 O43.2 
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If, due to lack of nutrition, part of the chorionic villi dies, a bilobar placenta is formed. 
Inflammatory processes and dystrophic changes lead to insufficient vascularization of individual sections of the decidua. This causes the death of some chorionic villi in the early gestation period. Areas of thinning of the placenta and various defects are formed. With the complete death of the villous chorion, foci without placental tissue (fenestrated placenta) are formed. In the presence of vessels going to the side, an additional lobule is detected, which is located at a distance from the edge of the child's place. nine0003 
Histological examination reveals premature involutional-atrophic changes caused by insufficient blood flow and overstretching of the lower segment. nine0003 
Rarely, through germination with invasion of the chorion into neighboring organs is observed. It can also be diffuse (the entire fetal site does not separate from the wall of the uterus) or focal (ingrowth occurs in a certain area). 
Bleeding in the third stage of labor develops with a dense attachment of the placenta. There are no signs of separation of the placenta, and the methods that accelerate this process are ineffective. nine0003 
Sometimes anomalies of attachment become an indication for extirpation of the uterus. nine0003 
Full presentation is indicated by the location of the placenta immediately above the internal os of the cervix. Attachment disorders are identified by abnormal lacunar blood flow in the thickness of the myometrium. 
It is necessary to improve the nutrition of the fetus and minimize the effects of hypoxia. Attachment anomalies require emergency surgical care. nine0003 
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In case of unsuccessful attempts to separate the placenta with anomalies of attachment and ongoing bleeding, the issue of removing the uterus with preservation of the appendages is decided. The intervention is performed under endotracheal anesthesia. nine0044 
