Hemophilia

• Type A hemophilia: There is not enough of the protein called factor VIII (factor 8). This type is also called factor 8 deficiency.
• Type B hemophilia: There is not enough of the protein called factor IX (factor 9). This type is also called factor 9 deficiency.

Almost always, the disease is passed down from parents to children.

Hemophilia happens because the gene that carries instructions for making clotting factor 8 or 9 does not work right. The gene is located on the X chromosome.

Chromosomes come in pairs. Females have 2 X chromosomes. Males have 1 X chromosome and 1 Y chromosome. Only the X chromosomes carry the genes for these clotting factors.

The disease is much more common in males. Males have hemophilia if they inherit an X chromosome carrying the abnormal gene from their mother.

Females hardly ever have hemophilia. But females may have bleeding problems if they inherit an abnormal gene from both parents or if they carry 1 copy of the gene and have very low levels of clotting factors. Females who carry 1 copy of the abnormal gene can pass it on to their children, even if they are healthy.

Our doctors are nationally known for treating children who have blood disorders. The doctors who will guide your child’s care are board certified in pediatric hematology. This means they are approved to give the special care your child needs and they constantly expand their knowledge about blood disorders.

We offer a full range of services for children with hemophilia, such as clotting factors, physical therapy and medicine, including new nonfactor drugs. We also help your child prevent bleeding.

We work with your family, your child and your child's primary doctor to get the right care and services for your child. We can also counsel parents who have hemophilia (or carry the gene) and want to know more about their risk of passing it to any future children.

We care for your whole child. Your family has a full team behind you, including doctors, nurses, genetic counselors, social workers and specialists in physical therapy, nutrition and pain management. Read more about the supportive care we offer.

Our specialty is treating children’s conditions while helping them grow up to be healthy and productive. 

Our physician-scientists help set national standards for care of young people with blood disorders. We provide the most advanced treatments in our region.

Children don’t react to illness, injury, pain and medicine in the same way as adults. They need – and deserve – care designed just for them. Our experience helps us recommend the right treatment at the right time to have the best results for your child and your family. We plan your child’s treatment based on years of experience and the newest research on what works best – and most safely – for children.

Our physician-scientists are working hard to improve treatments and outcomes for children with hemophilia and other blood disorders. We offer our patients the very latest treatments being explored in research studies called clinical trials. In the lab, researchers are making advances that could lead to new ways of treating this illness.

Scientists at Seattle Children’s Research Institute have genetically reprogrammed immune system cells (human plasma B cells) to release the factor 9 clotting protein that is lacking in patients with hemophilia B. Because they have long life span, these B cells could be the ideal cell type to treat diseases where patients cannot make a needed protein, like clotting factor.

Dr. Carol Miao’s lab is working on new approaches that include:

• New ways to deliver gene therapy
• Better methods to transplant blood-forming stem cells into bone marrow
• Immunotherapy to prevent patients’ bodies from rejecting clotting factors

Having a child with hemophilia affects the whole family. We help by offering same-day appointments for children with urgent needs. If needs are not urgent, most new patients are seen within 1 or 2 weeks.

During visits, we take time to explain your child’s condition. We help you fully understand your treatment options and make the choices that are right for your family.

Together with the Washington Center for Bleeding Disorders at Bloodworks Northwest, we provide 24-hour telephone support by hemophilia nurse specialists.

Our child life specialists and social workers help your child and your family through the challenges of this condition. We connect you to community resources and support groups. Each summer doctors from our team provide medical coverage for the week-long hemophilia family camp called Camp I-Vy.

At Seattle Children's, we work with many children and families from around the Northwest and beyond. Whether you live nearby or far away, we can help with financial counseling, schooling, housing, transportation, interpreter services and spiritual care. Read about our services for patients and families.

We also advise parents who have hemophilia (or carry the gene) and want to know more about their risk of passing it to their children. This is called genetic counseling.

Our genetic counselors can talk with you about the pros and cons of genetic testing. They explain test results and your chance of having a child with hemophilia in a future pregnancy.

Our genetic counselors also will give you information about your child’s condition. Counseling can help you make informed decisions about family planning and your child’s treatment.

To treat hemophilia, doctors give your child the clotting factor they need: factor 8 or factor 9.

The factor is mixed with fluid and given through a tube into your child’s vein. This is called an infusion or intravenous (IV) treatment.

How often your child needs treatment depends on their disease. In mild cases, they may need clotting factors only when they have a bleeding problem.

In severe cases, a child will get regular infusions, as often as 3 or 4 times a week. Some children may be able to use clotting factor mixtures that can be taken less often.

Your child can get infusions without having to spend a night in the hospital.

• Our outpatient infusion unit is staffed by expert nurses and is open on weekends.
• We teach patients and families to mix and give infusions at home. This may be done with a butterfly needle or an intravenous (IV) line that we place before a child goes home.

Our goal is that all children with hemophilia learn to self-infuse before adulthood so they have the skills to treat themselves at home.

A new drug (emicizumab) that boosts blood clotting may be an option for some children with hemophilia A. It is longer lasting than factor 8, so children need fewer infusions. Another benefit is that nonfactor treatments do not prompt the immune system to reject them, as sometimes happens when people are given factor 8. The U.S. Food and Drug Administration (FDA) has approved emicizumab to treat children, teens and adults.

Other nonfactor treatments (fitusiran and concizumab) reduce anticlotting activity in the body. They are under study in clinical trials. Research studies of gene therapy may be an option for patients 18 years and older within 2 years.

We offer clinical trials:

• Of new options developed here at Seattle Children’s
• In collaboration with other investigators around the country
• Of new treatments developed by pharmaceutical companies

Your child’s doctor will talk with you about any new treatment options that might help your child. Then you can decide whether you want to take part.

• Find many clinical trials offered at Seattle Children’s on our Current Research Studies page or on clinicaltrials.gov. Read our guide about searching for trials on ClinicalTrials.gov (PDF).
• Contact us at 206-987-2106.
• Email us.

Keeping muscles, bones and joints strong is important for young people with hemophilia. Our physical therapist sees your child every year to:

• Check their growth and strength
• Find any areas that need strengthening
• See if they need therapy to keep their joints healthy and working well

If your child has had bleeding in a joint or muscle, they are at risk of losing muscle strength, flexibility and mobility. Your child will work with a physical therapist to help fully recover and reduce the chance of it happening again.

Medicines that help keep blood clots from breaking down are called antifibrinolytic (AN-te-fi-BRIN-o-LIT-ik). They are used mainly to reduce bleeding after:

• An injury
• Having a tooth pulled
• Surgery

Children with some mild forms of hemophilia may take medicine to help increase clotting. It is called desmopressin (brand name Stimate). The doctor will try a test dose to see if it works well for your child. If it does, your child may take it before any planned surgery or dental work.

Children with hemophilia can lead active, normal lives. We help you and your child lower the risk of bleeding problems.

Your child’s doctor will recommend that your child:

• Avoid certain contact sports, such as tackle football, boxing and hockey.
• Avoid medicines that increase bleeding, such as aspirin and ibuprofen (Advil). Your child's doctor can give you details about which medicines to avoid.
• Take extra good care of their teeth to help avoid dental work that might cause bleeding. When a child does need dental work, we often work closely with Seattle Children's Dental Medicine to give factor treatment right before a visit to the dentist.
• Consider wearing a medical identification bracelet (like MedicAlert) so healthcare providers are aware your child has bleeding problems.