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Planning a safe pregnancy with an MPN | CION Cancer Clinics
Yes, many women with essential thrombocythaemia or polycythaemia vera have healthy pregnancies. The extra risks are blood clots, miscarriage and placental problems, and they continue into the weeks after birth. Planning before conception, with a haematologist and a high-risk pregnancy team working together, lowers those risks. Aspirin is commonly used, with heparin injections or interferon for some women. At CION Cancer Clinics, every leukaemia, MDS and MPN case is reviewed by our haematologist and discussed at a tumour board before a plan is agreed.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- Can you have a healthy pregnancy with polycythaemia vera or ET?
- What does care look like from planning to after birth?
- Which treatments may be used while you are pregnant?
- What do these pregnancy terms mean?
- What about breastfeeding and future pregnancies?
- What do families worry about that is not true?
- Common questions about pregnancy with an MPN
The short answer
Can you have a healthy pregnancy with polycythaemia vera or ET?
Yes, many women with essential thrombocythaemia or polycythaemia vera have healthy babies. The pregnancy does carry extra risks, mainly blood clots, miscarriage and problems with the placenta. Planning ahead with your haematologist and a high-risk pregnancy team lowers those risks.
Why an MPN matters in pregnancy
Pregnancy already makes the blood clot more easily. An MPN (myeloproliferative neoplasm, a condition where the marrow makes too many blood cells) adds to that. Clots can form in the mother's veins, or in the small vessels of the placenta, which feeds the baby. This is why the plan focuses on keeping blood flowing well from before conception to several weeks after birth.
Who needs the closest care
The risk is higher if you have had a clot or serious bleeding before, a previous pregnancy loss or placental problem, very high platelet counts, or other conditions such as high blood pressure or diabetes. These women usually need more medicines and more frequent checks. Women with none of these still need planned care, but often a simpler plan.
What an unplanned pregnancy means
Many pregnancies are not planned, and that is common. If you find you are pregnant, the most useful step is to tell your haematologist quickly. Early review means medicines can be checked, aspirin or other care can be started if needed, and an obstetrician can be involved from the first weeks. Coming in early matters more than having planned everything perfectly.
This page cannot tell you your own risk. Your haematologist and obstetrician work that out together from your history and reports.The pathway
What does care look like from planning to after birth?
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Before you try to conceive
Tell your haematologist you are planning a pregnancy. Some MPN medicines are not safe for a developing baby, and the switch has to be planned in advance by your doctor. Do not stop or change any medicine on your own.
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As soon as you are pregnant
Let both teams know early. Your risk is reviewed again, and a written plan is agreed for medicines, blood counts and scans.
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Through the pregnancy
Blood counts are checked regularly. Extra ultrasound scans may watch the baby's growth and the blood flow through the placenta. In polycythaemia vera, venesection may continue to keep the blood from getting too thick.
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Planning the delivery
The teams agree timing, whether an epidural is safe with your medicines, and how blood thinners are paused around labour. This is decided by your doctors, never by you alone.
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The weeks after birth
Clot risk stays high after delivery. Blood thinning injections are often continued for some weeks, and your usual MPN treatment is reviewed.
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Signs that cannot wait
Go to the nearest emergency department now, or call 108, if you have sudden breathlessness or chest pain, a painful swollen leg, a severe headache with blurred vision, weakness on one side of the face or body, heavy vaginal bleeding, or the baby moving much less than usual. Tell them you are pregnant and have an MPN. Do not wait for your next antenatal visit.
Treatment in pregnancy
Which treatments may be used while you are pregnant?
Your teams choose based on your risk. The doses and timing are always set by them.
Aspirin
Most women with an MPN are advised to take aspirin through pregnancy. It helps keep blood flowing through the placenta. It may not suit women with a history of bleeding or very high platelet counts.
Blood thinning injections
Low molecular weight heparin is a daily injection under the skin. It is often added for women at higher risk, and after delivery. It does not cross to the baby.
Interferon
If counts need lowering during pregnancy, interferon is the medicine usually considered, because it is thought safer for the baby than the alternatives.
Tell your team about
- Low mood or depression
- Thyroid problems
Venesection
In polycythaemia vera, removing blood can continue during pregnancy when your team feels it is needed. It is done carefully to avoid feeling faint.
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Words you will hear
What do these pregnancy terms mean?
- High-risk pregnancy
- A pregnancy that needs closer checks because of a health condition. It does not mean something will go wrong.
- Placental insufficiency
- The placenta is not passing enough blood and food to the baby, which can slow the baby's growth.
- Pre-eclampsia
- High blood pressure in pregnancy with protein in the urine. It needs prompt care.
- Doppler scan
- An ultrasound that measures blood flow through the placenta and the baby's vessels.
- Postpartum period
- The weeks after birth, when clot risk stays high.
- Teratogenic
- A medicine that can harm a developing baby.
After the baby arrives
What about breastfeeding and future pregnancies?
Many women with an MPN breastfeed safely. Whether you can depends on the medicines you need after delivery. Aspirin and heparin injections are commonly used while breastfeeding, but some MPN medicines pass into breast milk and are not advised. Ask this question before the birth, so the plan is ready.
When your usual treatment restarts
If you were on a medicine before pregnancy that was changed, your haematologist decides when and how to go back to it. This depends on your counts, whether you are breastfeeding and your wishes about another pregnancy.
Planning another pregnancy
A difficult first pregnancy does not mean the next will go the same way. Your teams will look at what happened and may change the plan next time. Allow time between pregnancies to review medicines and counts.
Contraception
Some hormonal contraceptives raise clot risk and may not suit women with an MPN. Discuss options with both your gynaecologist and haematologist.
At CION, the haematology team can work with your obstetrician and coordinate high-risk pregnancy care with qualified centres.Commonly believed
What do families worry about that is not true?
"With a blood cancer, she should not get pregnant at all."
Many women with essential thrombocythaemia or polycythaemia vera have successful pregnancies. The key is planning with the right teams, not avoiding pregnancy altogether.
"Her platelets often fall in pregnancy, so she can stop medicines."
Counts often drop naturally in pregnancy, but clot risk remains. Aspirin and other medicines are still usually needed. Only the treating team should change the plan.
"The baby will inherit the MPN."
The gene changes behind MPNs usually develop during a person's life and are not passed on to children. Families with several affected members are rare.
"Once the baby is born, the danger is over."
The weeks after birth carry a high clot risk. That is why injections and checks often continue after you go home.
Questions we are asked
Common questions about pregnancy with an MPN
I found out I am pregnant while on hydroxyurea. What should I do?
Contact your haematologist the same day. Do not panic and do not stop or change medicines on your own. Many women in this situation go on to have healthy babies. Your team will review your medicines, arrange a switch if needed and plan extra scans with an obstetrician.
Is a caesarean section needed?
Not usually because of the MPN alone. The type of delivery is decided by obstetric reasons, as in any pregnancy. What the MPN changes is the planning around blood thinners and pain relief such as an epidural, which both teams agree well before the due date.
Does ET or PV affect fertility?
An MPN itself is not known to make it harder to conceive. Some medicines used to treat it may not be suitable while trying to conceive. If pregnancy is taking longer than expected, speak to your gynaecologist and tell them about your MPN.
Will my blood counts change during pregnancy?
They often do. Platelet counts and haematocrit (the share of blood made up of red cells) commonly fall during pregnancy and rise again after birth. Laboratory reference ranges also differ. Your team reads each result alongside your symptoms and earlier tests, not on its own.
Are heparin injections safe for the baby?
Low molecular weight heparin does not cross the placenta and is widely used in pregnancy. You may notice bruising where you inject. Your team will teach you or a family member how to give it and explain when to pause it before delivery.
What if I have had a miscarriage before?
Tell your haematologist and obstetrician. A previous loss is taken into account when planning, and it may mean adding heparin injections or extra scans. It does not mean the next pregnancy will end the same way, and planned care makes a real difference.
Which doctors should be involved?
You need a haematologist and an obstetrician experienced in high-risk pregnancy, working together and sharing reports. An anaesthetist should review you before delivery. Keep one file with all reports and carry it to every visit so each doctor sees the full picture.
Can I travel during pregnancy with an MPN?
Short journeys are usually fine. Long car, bus, train or air journeys raise clot risk, so ask your team first. On any long trip, drink water, walk every hour or so, and carry your reports and a list of medicines with you.
Your Haematologist
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Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- NHS — Essential thrombocythaemia
- NHS — Polycythaemia
- National Cancer Institute — Chronic Myeloproliferative Neoplasms Treatment (PDQ), Patient Version
- American Society of Hematology — Blood disorders: patient education
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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Related pages
Talk to us
Planning a pregnancy with an MPN?
Share your reports with us. Our haematology team will review your picture and help coordinate care with a high-risk pregnancy team. For emergency signs, call 108.