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Factor replacement therapy for haemophilia, explained | CION Cancer Clinics
Factor replacement is the main treatment for haemophilia. The missing clotting factor, factor VIII for haemophilia A or factor IX for haemophilia B, is injected into a vein so blood can clot close to normally for a while. It is used to stop a bleed, or given regularly to prevent bleeds. This page explains the types of factor, how it is given, its risks, and what it cannot do. At CION Cancer Clinics, our haematologist cares for anaemia, bleeding, clotting and inherited blood disorders, with ArogyaSri, CGHS and cashless insurance accepted.
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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
- What is factor replacement therapy?
- What kinds of factor products are there?
- How is factor actually given?
- Regular factor or factor only when you bleed?
- What are the risks, and who does it not suit?
- What do families often believe about factor?
- How do families in Telangana and Andhra Pradesh get factor?
- Common questions about factor replacement
The short answer
What is factor replacement therapy?
Factor replacement gives back the clotting factor your blood is missing. It is injected into a vein, and for a while your blood can clot close to normally, which stops a bleed or prevents one.
Which factor you receive
People with haemophilia A lack factor VIII, so they receive factor VIII. People with haemophilia B lack factor IX, so they receive factor IX. The two are not interchangeable, which is why the exact type must be written on every prescription, card and hospital letter.
Why it has to be repeated
Replacement does not fix the gene. The body uses up the injected factor over time, and the level falls back to your own baseline. That is why factor is given again, either on a regular schedule or each time a bleed happens. Your haematologist sets how much and how often, based on your weight, your level, the kind of bleed and blood tests.
What it has changed
Before factor was widely available, repeated joint bleeds left many young men with stiff, painful joints. Steady access to factor has changed that picture for families who can get it regularly.
Never change the amount or timing of factor on your own. Speak to your treating team first.The options
What kinds of factor products are there?
All of them replace the missing factor. They differ in how they are made and how long they last in the blood.
Plasma-derived factor
Made from donated human plasma, the liquid part of blood. Modern products are screened and treated to remove viruses.
Often used
- Through government programmes
- Where supply is the deciding factor
Recombinant factor
Made in a laboratory from cells, without human plasma. It works the same way, and removes the small leftover worry about infections carried in blood.
Extended half-life factor
A recombinant factor changed so it stays in the blood longer. It can mean fewer injections. It usually costs more and is not always available through schemes.
When factor stops working
Some people develop an inhibitor, an antibody that blocks the factor. They may need bypassing agents, or a non-factor medicine such as emicizumab for haemophilia A.
For mild haemophilia A, desmopressin can sometimes raise your own factor level instead.Not sure whether this applies to you?
Ask an oncologistIn practice
How is factor actually given?
Mixed just before use
Most factor comes as a powder with a small bottle of sterile water. The two are mixed gently, just before the injection, following the leaflet and the nurse's training.
Injected into a vein
The dose goes slowly into a vein, usually in the hand or arm. At first this happens at a hospital or haemophilia treatment centre.
Learning to do it at home
Many parents learn to inject their child, and many older children and adults learn to inject themselves. Treating early at home stops a bleed before it grows.
Keeping a record
Write down every injection, the reason, the batch number and how the bleed settled. Your haematologist uses this to adjust the plan.
Two ways to use it
Regular factor or factor only when you bleed?
Regular preventive factor
On-demand factor
Given on a fixed schedule, even when there is no bleed
Given only once a bleed has started, or before surgery
Aims to stop bleeds happening and protect the joints
Treats each bleed, but joint damage can still build up
Usually advised for severe haemophilia, especially in children
Often enough for mild haemophilia with rare bleeds
Needs a steady supply of factor and more injections
Uses less factor overall, but each bleed needs quick access
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Honest limits
What are the risks, and who does it not suit?
Factor is generally well tolerated. The two things your team watches for most closely are inhibitors and problems with the vein.
Inhibitors
In some people, mostly with severe haemophilia A, the immune system starts treating the injected factor as foreign and makes an antibody against it. The first sign is often that a bleed does not settle as it used to. A blood test confirms it. Tell your team if treatment seems to be working less well.
Reactions and vein access
Allergic reactions are uncommon but possible, so early doses are given where help is at hand. Young children with difficult veins sometimes need a small port placed under the skin, which carries its own infection risk.
Who it does not suit on its own
Someone with a high-level inhibitor will not respond to standard factor and needs a different plan. Factor also does not help bleeding caused by other disorders, such as a low platelet count.
Commonly believed
What do families often believe about factor?
"We should save factor for a really bad bleed."
Waiting usually makes a bleed larger and harder to stop, and uses more factor in the end. Early treatment, as your team has advised, protects the joint and is the better use of supply.
"Once the swelling goes down, the bleed is over."
A joint can keep bleeding quietly after the pain eases. Follow the full plan your haematologist has given for that bleed, and ask before stopping.
"Factor from blood will give him an infection."
Modern plasma-derived products go through donor screening and virus removal steps. The risk today is very low. If you are worried, ask which product is being used and why.
"Fresh blood or plasma works just as well."
Whole blood and plasma carry very little factor for the volume given, and more risk. They are an emergency fallback only when factor cannot be found.
Access
How do families in Telangana and Andhra Pradesh get factor?
Supply, not medical knowledge, is often the hardest part. Many states in India supply factor through government haemophilia programmes and designated treatment centres, and some families also use Aarogyasri, PM-JAY, CGHS, ECHS, EHS or cashless insurance for related care.
Rules change, so check them
What each scheme covers, which products are stocked, and which centre you must register with all change from time to time. Ask the treatment centre or scheme office for the current rules before you rely on them.
What this page cannot tell you
It cannot tell you which product, amount or schedule is right for you. Those depend on your level, your weight, your bleeds, any inhibitor, and what supply you can reliably get. CION's haematology team reviews the whole picture, discusses complex cases at a tumour board, and helps you link with the right treatment centre and scheme.
Bleeding into the head, throat or belly, or bleeding that will not stop, needs the nearest emergency department now. Call 108.Questions we are asked
Common questions about factor replacement
Is factor replacement a lifelong treatment?
For most people, yes. Factor replaces what the body lacks but does not change the gene, so the need continues. How often it is needed can change over the years, depending on bleeding, activity, joint health and any inhibitor. Gene therapy is being studied and used in some countries, but it is not widely available in India.
Can we give factor at home?
Often, yes, once a parent or the patient has been trained by the treatment centre and is confident. Home treatment means a bleed can be treated quickly. You still need a clear written plan, a record book, safe storage and a number to call when a bleed does not settle.
How do we store factor?
Storage depends on the product. Many need a refrigerator, and some can be kept at room temperature for a limited period. Follow the leaflet in the box and the advice of your treatment centre. Do not freeze it, and do not use a vial past its expiry date.
What if the factor is not stopping the bleed?
Contact your treatment team the same day. The bleed may need more treatment, or an inhibitor may have developed. A blood test can check. If the bleed is in the head, throat or belly, or is heavy, go to the nearest emergency department or call 108 and say the person has haemophilia.
Is recombinant factor better than plasma-derived?
Both replace the missing factor and both control bleeding. The choice depends on availability, what schemes supply, cost and your team's view of inhibitor risk for your situation. Neither is right for everyone, so discuss the reasons with your haematologist rather than switching on your own.
Does my child need factor before an injection or vaccine?
Vaccines can usually be given under the skin with firm pressure afterwards, often without factor. Operations, tooth removals and some procedures do need planned factor cover. Tell every doctor, nurse and dentist about the haemophilia beforehand, and let the haematology team plan it.
Is emicizumab the same as factor replacement?
No. Emicizumab is a different medicine for haemophilia A that copies part of factor VIII's job. It is given under the skin and is used to prevent bleeds, including in people with inhibitors. Breakthrough bleeds may still need factor or other treatment, planned carefully by the team.
Can CION help if we already get factor elsewhere?
Yes. Bring your diagnosis, factor level, inhibitor results and record book. The haematology team can review your plan, explain your options and help coordinate with your existing treatment centre or scheme. It does not replace the centre that supplies your factor.
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Sources
- NHS — Haemophilia: treatment
- National Heart, Lung, and Blood Institute — Hemophilia: treatment
- American Society of Hematology — Hemophilia
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.
Keep reading
Related pages
Severity in Haemophilia: Mild, Moderate, SevereHow your factor level shapes the treatment planRegular Treatment vs Treating Bleeds as They HappenThe two ways factor is used, compared in depthInhibitors in HaemophiliaWhat happens when factor stops workingHaemophilia Schemes and Free Factor in IndiaHow families get factor through government programmesEmicizumab and Newer OptionsNon-factor treatment for haemophilia A
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