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Factor XI Deficiency and Circumcision in Babies: My Experience and Approach

My experience managing circumcision in babies at risk of Factor XI deficiency (Haemophilia C)

Written by Dr Martin Harris BPharm Hons, MB BS, LRCP MRCS FRCGP RCPathMe Dr Martin Harris has extensive experience in baby circumcision and has been involved in the management and planning of circumcision in infants from families affected by Factor XI deficiency.

Factor XI deficiency, sometimes known as Haemophilia C, is an uncommon inherited bleeding disorder that requires particular care when a baby is undergoing surgery.

Circumcision is one of the surgical procedures in infancy where a previously unrecognised bleeding disorder may become apparent. When a baby is known to come from a family affected by Factor XI deficiency, the possibility of increased bleeding risk needs to be considered before circumcision takes place.

Over the years, I have developed experience in this area, including working with specialist haematology teams in London and being involved in a protocol developed specifically for the management of circumcision in male infants from families affected by Factor XI deficiency.

My approach has always been that circumcision in a baby with a known or suspected bleeding disorder should not be treated as an ordinary circumcision.

The haematological risk needs to be understood and appropriately planned before the procedure.

Factor XI Deficiency and Circumcision: Key Points

For parents considering circumcision when there is a family history of Factor XI deficiency, the important points are:

Factor XI deficiency can increase the risk of bleeding following surgery.
Circumcision has been reported as a procedure following which previously unrecognised Factor XI deficiency may become apparent.
The severity of bleeding does not always correspond closely to the Factor XI level measured in the laboratory.
Newborn Factor XI levels are naturally lower than levels in older children and adults.
A neonatal Factor XI result therefore needs to be interpreted using appropriate age-related information.
Some babies may require repeat assessment as they become older.
A personal and family history of abnormal bleeding is important when assessing risk.
Some babies may require haematology-led haemostatic treatment or hospital-based management.
Tranexamic acid may have a role in appropriate circumstances, but it must be prescribed by the treating clinical team.
Parents should not use an old protocol or information from the internet to decide whether a baby should undergo circumcision or to calculate medication.

The most important principle is simple: the circumcision should be planned with the appropriate haematology team before the procedure takes place.

My Experience Managing Circumcision in Babies with Factor XI Deficiency

During my work at Circumcision London and as a Circumcision Mohel, I worked with Dr Niamh O’Connell when she was a research fellow at the Haemophilia Centre and Haemostasis Unit at the Royal Free Hospital in London.

She was working with Professor Christine Lee and Dr Ri Liesner, Consultant Haematologist and Director of the Haemophilia Centre at Great Ormond Street Hospital for Children.

Dr O’Connell subsequently became a Consultant Haematologist in Ireland.

Together, we investigated aspects of Factor XI deficiency and developed a protocol for the management of circumcision in male infants born to families affected by Factor XI deficiency.

The purpose of the protocol was straightforward: to identify babies at increased risk of bleeding and to plan their circumcision with appropriate haemostatic support when required.

This work has been particularly important to me because it brought together two areas of my professional practice: circumcision and the careful management of infants with a known or suspected bleeding disorder.

It also reinforced an important principle that has stayed with me throughout my work:

Preparation is far better than reacting to bleeding after the event.

What Is Factor XI Deficiency?

Factor XI is one of the proteins involved in the body's blood-clotting system.

When Factor XI is significantly reduced or absent, the normal haemostatic process can be impaired and some people may experience excessive or prolonged bleeding, particularly after surgery or other haemostatic challenges.

Factor XI deficiency is uncommon in the general population but is considerably more frequent in some populations, including people of Ashkenazi Jewish ancestry.

It can affect both males and females. Its inheritance is more complex than some of the better-known inherited bleeding disorders, and the genetic pattern can vary between families.

One of the important features of Factor XI deficiency is that the severity of bleeding does not always correspond precisely to the Factor XI level measured in the laboratory.

Some people with very low Factor XI levels have relatively little bleeding, while others can experience significant bleeding after surgery despite having a less marked laboratory deficiency.

This is an important point when considering circumcision.

A Factor XI result is extremely useful, but it should not be interpreted in isolation.

The baby's clinical circumstances, personal bleeding history where available, family history and the nature of the planned procedure also matter.

Why Factor XI Deficiency Matters Before Circumcision

Circumcision involves a surgical wound.

In a baby with significant Factor XI deficiency, there may therefore be an increased risk of postoperative bleeding.

Circumcision has historically been reported as one of the situations in which previously unrecognised Factor XI deficiency may become apparent.

This is why I do not regard a family history of Factor XI deficiency as something that can simply be noted in the medical history and then forgotten.

It needs to be actively considered before circumcision.

The aim is not to create unnecessary anxiety for parents.

The aim is to identify a potential bleeding disorder before the procedure, obtain the appropriate information and make sure that the right medical plan is in place.

Testing for Factor XI Deficiency Before Circumcision

When there is a known family history of Factor XI deficiency, the baby's Factor XI level may be measured as part of the specialist assessment.

There is an important complication, however.

Factor XI levels in newborn babies are naturally lower than those seen in older infants, children and adults.

An apparently low neonatal result may therefore require specialist interpretation using appropriate age-related information.

A result obtained at birth should not simply be labelled "deficient" by applying an adult reference range without considering the baby's age and clinical circumstances.

The result needs to be interpreted by clinicians familiar with neonatal haemostasis and the particular bleeding disorder.

In some circumstances, repeat testing later in infancy may provide more useful information about the child's Factor XI status.

This is one reason why a baby's management should be discussed with the appropriate haemophilia or paediatric haematology team rather than being based on a laboratory number alone.

Why Repeat Assessment May Be Important

One of the difficulties with Factor XI deficiency in infancy is distinguishing a genuinely significant deficiency from the naturally lower Factor XI levels found during the neonatal period.

A particularly low result at birth may therefore require careful specialist assessment.

An intermediate result may also need interpretation in the context of the family history and, where appropriate, reassessment as the baby becomes older.

For some babies, delaying circumcision may be the safest course while the haematology team obtains a clearer assessment.

The timing of any repeat test should be decided by the baby's treating clinicians.

The important point is that a neonatal result should be interpreted in the context of neonatal haemostasis rather than automatically being compared with an adult reference range.

The Historical Protocol I Worked With

The protocol with which I was involved used the baby's Factor XI level, together with the clinical circumstances, to help determine the appropriate management.

In broad terms, the historical approach involved:

assessing the baby's Factor XI result;
considering whether the result suggested a significant deficiency
taking the family and bleeding history into account
considering whether haemostatic treatment was required
delaying circumcision when the bleeding risk could not be adequately assessed or managed
and arranging hospital-based management where the baby's clinical circumstances required it.

The historical protocol included different approaches according to the Factor XI level and the circumstances of the individual baby.

However, I would not advise parents or practitioners to take the thresholds or treatment arrangements from an old protocol and apply them independently today.

Current specialist management may vary according to the individual patient, bleeding history, laboratory results, planned procedure and recommendations of the treating haemophilia or paediatric haematology centre.

The important principle remains the same:

The circumcision should be planned together with the appropriate haematology team before the procedure takes place.

Tranexamic Acid and Factor XI Deficiency

Tranexamic acid is an antifibrinolytic medicine that has an established role in the management of bleeding in appropriate patients with Factor XI deficiency.

Rather than replacing Factor XI, tranexamic acid helps reduce the breakdown of a clot once it has formed.

It can be particularly useful around procedures where local fibrinolysis may contribute to bleeding.

Historically, the protocol with which I worked used tranexamic acid in infants whose clinical and laboratory circumstances allowed circumcision to proceed with haemostatic cover.

However, the precise dose, preparation, timing and duration of treatment must be determined and prescribed by the treating clinical team.

Parents should never take a dose from an old protocol or an internet article and administer tranexamic acid independently.

When Hospital-Based Haemostatic Support May Be Needed

For babies with a significant Factor XI deficiency, a different approach may be necessary.

Depending on the individual circumstances, specialist haematologists may consider haemostatic treatment such as tranexamic acid, fresh frozen plasma or, where appropriate and available, factor XI-containing replacement therapy.

The choice of treatment is a specialist clinical decision.

These treatments are not something I would ask parents to arrange themselves.

They require specialist haematological assessment and, where appropriate, treatment in a setting with the necessary medical support.

This is precisely why significant Factor XI deficiency can change the setting in which I would consider circumcision.

Planning Circumcision Before the Day of the Procedure

In my experience, good management begins well before the baby arrives for circumcision.

I want to know:

whether there is a confirmed family history of Factor XI deficiency
which parent or other family members are affected
whether other family members have experienced abnormal bleeding
whether the baby has had Factor XI testing
what the result was
whether the result requires specialist interpretation or repeat assessment
what the haematology team recommends
and what haemostatic treatment, if any, has been planned.

The circumcision should then be arranged around that medical plan.

This is very different from discovering on the morning of circumcision that there may be a significant family history of a bleeding disorder.

The more information that is available beforehand, the better the procedure can be planned.

My Relationship with the Haematology Team

For me, this is one of the most important aspects of caring for these babies.

I do not regard the circumcision practitioner as working independently when a baby has a potentially significant bleeding disorder.

The haematologist understands the coagulation disorder.

I understand the circumcision procedure and the practical aspects of performing and monitoring it.

The parents understand their baby and their family history.

These three parts need to work together.

The aim is not to make the situation unnecessarily complicated.

The aim is to make sure that the right information is available before the procedure takes place and that an appropriate plan is agreed in advance.

Why I Do Not Treat Factor XI Deficiency as Simply a Number

There is an understandable temptation to say:

"His Factor XI is X, therefore we do Y."

Real clinical medicine is rarely quite that simple.

The Factor XI level is important, but bleeding tendency does not always correlate perfectly with the laboratory result.

A previous bleeding history can therefore be highly relevant.

So can the nature and location of the planned surgery.

This is particularly important because circumcision involves a surgical site where bleeding can be clinically significant.

For this reason, specialist haematology input is important when a baby with possible or confirmed Factor XI deficiency is being considered for circumcision.

My Personal Approach to Circumcision in This Setting

When I perform circumcision in this setting, I approach the baby with the same care that I would give to any infant undergoing the procedure, but with additional attention to the haemostatic plan.

I want the Factor XI result, if available, to be known and properly understood.

I want the haematology plan to be clear.

I want the parents to know what treatment has been arranged and what they should do if there is unexpected bleeding.

And I want appropriate medical support to be available if it is required.

For me, this is not simply about performing the circumcision.

It is about managing the entire episode of care responsibly.

If Your Baby Has a Family History of Factor XI Deficiency

If your baby has a family history of Factor XI deficiency, I would encourage you to discuss the situation with the relevant haemophilia or paediatric haematology team before arranging circumcision.

The questions I would want answered include:

Has the baby been assessed for Factor XI deficiency?
Has a Factor XI level been measured?
Has the result been interpreted using appropriate neonatal information?
Does the baby require repeat testing?
Is there a personal or family history of abnormal bleeding?
Does the haematology team recommend any haemostatic treatment?
Should circumcision take place in a hospital environment?
What should the parents do if unexpected bleeding occurs?

The answers will depend on the individual baby and family.

There is no single Factor XI level that can safely be used by parents as a simple "yes" or "no" test for circumcision.

Why Experience Matters

Factor XI deficiency is uncommon.

Consequently, many parents may understandably find it difficult to know who has genuine experience of managing circumcision in this particular situation.

My involvement in developing and applying a protocol for circumcision in infants from families affected by Factor XI deficiency has given me experience of the practical issues involved.

That experience has taught me one particularly important lesson:

Preparation is far better than reacting to bleeding after the event.

A baby with a known or suspected bleeding disorder should be assessed and planned for before circumcision.

Frequently Asked Questions

Can a baby with Factor XI deficiency have a circumcision?

In some circumstances, circumcision may be possible, but the decision should be made following appropriate assessment of the baby's bleeding risk and in consultation with the relevant haemophilia or paediatric haematology team.

The severity of Factor XI deficiency, the baby's bleeding history, the family history and the circumstances of the procedure all need to be considered.

Should a baby with a family history of Factor XI deficiency be tested?

A known family history should be discussed with the baby's paediatric or haematology team.

Where appropriate, Factor XI testing may form part of the assessment, but neonatal results need specialist interpretation because Factor XI levels are naturally lower in newborn babies.

Can Factor XI levels be low in newborn babies?

Yes.

Factor XI levels in newborns are naturally lower than in older infants and adults. This means that an apparently low result at birth should be interpreted in an age-appropriate clinical context rather than automatically being classified using an adult reference range.

Does a low Factor XI level always mean that a baby will bleed?

No.

Bleeding tendency in Factor XI deficiency does not always correspond closely to the laboratory Factor XI level.

This is one reason why a personal or family bleeding history and the nature of the planned surgery are important when assessing risk.

Can circumcision be delayed?

Yes.

In some circumstances, delaying circumcision may allow the haematology team to obtain additional information or arrange appropriate haemostatic management.

Whether circumcision should be delayed is a clinical decision for the baby's treating team.

Does a baby with Factor XI deficiency need treatment before circumcision?

Not every baby will require the same treatment.

Some babies may require haemostatic cover, while others may require a different approach or hospital-based management.

The treatment plan should be determined by the appropriate haematology team rather than by the parents or circumcision practitioner alone.

My Final Message to Parents

I understand that parents may initially find the words "Factor XI deficiency" and "circumcision" a worrying combination.

My experience is that careful planning makes a significant difference.

There is no reason to approach the situation with unnecessary alarm, but there is also no reason to be casual about it.

The important thing is to know about the possible bleeding disorder before the procedure, obtain the appropriate laboratory information, involve the specialist haematology team and agree a haemostatic plan before circumcision takes place.

That is the approach I have followed in my work with families affected by Factor XI deficiency.

For me, the central principle is simple:

Know the risk. Plan the procedure. Work with the haematology team. And never leave the management of a potentially significant bleeding disorder to chance.

Medical Information Disclaimer

This article describes my professional experience and explains the principles behind a historical protocol with which I was involved.

It is provided for general educational information and is not an individual treatment plan or a substitute for specialist medical advice.

Factor XI deficiency is a specialist bleeding disorder. A baby's Factor XI result should be interpreted by an appropriately qualified haematologist or paediatric coagulation specialist, particularly because Factor XI levels in newborns differ from those in older children and adults.

Parents should not use the information in this article to decide independently whether their baby should undergo circumcision, to calculate a dose of tranexamic acid or another medicine, or to arrange haemostatic treatment.

Current specialist recommendations may differ from historical protocols, and treatment decisions should be made by the baby's treating clinicians and haemophilia centre.

If your baby has known or suspected Factor XI deficiency and circumcision is being considered, the procedure should be discussed with the appropriate specialist team before it is undertaken.

Last medically reviewed: October 2026