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Inciteful Med

Validation & Orientation: Understanding Factor XIII Deficiency

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Factor XIII deficiency is a rare bleeding disorder where blood clots form but lack the stability to hold together, leading to delayed bleeding. Because the initial clot forms normally, standard blood tests like PT and aPTT usually appear normal. Key warning signs include umbilical stump bleeding in newborns and delayed bleeding after surgery.

Key Takeaways

  • • Factor XIII deficiency causes unstable clots, leading to delayed bleeding hours or days after injury.
  • • Standard blood tests like PT and aPTT are usually normal because they do not measure clot stability.
  • • Umbilical stump bleeding is a major red flag seen in about 80% of newborns with the severe form.
  • • Treatment typically involves monthly prophylactic infusions to prevent bleeding episodes.
  • • The condition is usually inherited (congenital) but can rarely be acquired later in life due to autoimmunity.

It is common for families dealing with Factor XIII (FXIII) deficiency to feel a sense of confusion or even frustration during the diagnostic process. You may have been told for years that “the blood work is normal,” even while witnessing clear signs of a bleeding disorder [1][2]. This happens because the standard tests used in every hospital do not “see” Factor XIII.

The Diagnostic Gap: Why Tests “Miss” This

When doctors suspect a bleeding problem, they typically order two tests: Prothrombin Time (PT) and Activated Partial Thromboplastin Time (aPTT). In Factor XIII deficiency, these tests are almost always normal [3][4].

To understand why, imagine building a brick wall. The PT and aPTT tests measure how fast the “bricks” (initial clot) are stacked. However, Factor XIII is the “mortar” or “superglue” that hardens and holds those bricks together [5]. In FXIII deficiency, your body can stack the bricks just fine (the initial clot forms), so the standard tests look perfect [6]. But because there is no mortar, the wall is unstable and eventually collapses, leading to delayed bleeding hours or days later [7][6].

Defining Factor XIII Deficiency

Factor XIII deficiency is an extremely rare bleeding disorder, affecting approximately 1 in every 3 to 5 million people [8][9].

Factor XIII Deficiency IS: Factor XIII Deficiency IS NOT:
A rare clotting factor deficiency [8] Hemophilia A or B (these affect different factors)
A problem with clot stability [5] A problem with platelets or the initial clot formation
Often marked by delayed bleeding [6] Always an immediate bleeding emergency
Treatable with monthly infusions [10] A condition that prevents a normal, active life

Red Flags That Trigger Suspicion

Because standard tests fail, doctors look for specific “Red Flags” to diagnose this condition:

  • Umbilical Stump Bleeding: Approximately 80% of newborns with the severe form experience persistent bleeding from the belly button area shortly after birth [11][12].
  • Intracranial Hemorrhage (ICH): Spontaneous bleeding inside the brain is a major risk and the leading cause of mortality in untreated patients [13][12].
  • Delayed Post-Surgical Bleeding: Bleeding that starts 24–48 hours after a procedure, even if the surgery itself seemed to go well [14][15].

Congenital vs. Acquired

Most information about Factor XIII deficiency refers to the congenital form, which is present from birth and inherited from parents [2]. However, there is also an acquired form, which usually affects older adults [16]. In the acquired form, the body’s immune system mistakenly attacks its own Factor XIII [17]. While the symptoms are similar, the treatments for the acquired form often involve suppressing the immune system in addition to replacing the factor [16][18].

A Bright Outlook

While the term “Factor XIII deficiency” sounds daunting, the outlook for patients today is excellent. With modern prophylactic treatment (preventative infusions), the risk of major bleeding is dramatically reduced [10][19]. Because Factor XIII stays in the blood for a long time, most patients only need treatment once every four weeks, allowing them to lead healthy, active, and full lives [10][20].

Frequently Asked Questions

Why are my blood tests normal if I have a bleeding disorder?
Standard blood tests like PT and aPTT measure how fast a clot forms (the 'bricks'). Factor XIII acts as the 'mortar' that stabilizes the clot after it forms. Since the initial clot forms normally in Factor XIII deficiency, these standard tests appear normal, masking the underlying stability problem.
What are the warning signs of Factor XIII deficiency?
The most common warning sign is persistent bleeding from the umbilical stump in newborns (seen in 80% of severe cases). Other red flags include spontaneous brain bleeds and bleeding that starts 24 to 48 hours after surgery or injury.
Is Factor XIII deficiency inherited or acquired?
Most cases are congenital, meaning the condition is inherited from birth. However, there is a rare acquired form, usually affecting older adults, where the immune system mistakenly attacks the body's Factor XIII protein.
How is Factor XIII deficiency treated?
Factor XIII deficiency is typically treated with prophylactic (preventative) infusions. Because Factor XIII stays in the blood for a long time, most patients only need an infusion once every four weeks to lead a healthy, active life.
What is the long-term outlook for this condition?
With modern preventative treatment, the outlook is excellent. Regular monthly infusions significantly reduce the risk of major bleeding, allowing patients to live full and active lives.

Questions for Your Doctor

  • • Why did my standard blood tests (PT and aPTT) come back normal if I have a bleeding disorder?
  • • Is my condition congenital (inherited from birth) or acquired (developed later in life)?
  • • Does our local hospital have a 'Quantitative Factor XIII Assay' available for accurate monitoring?
  • • What is the plan for my preventative (prophylactic) treatment to ensure I can live an active life?
  • • Do we need to test my children or other family members for this condition?

Questions for You

  • • Did I (or my child) have unusual bleeding from the umbilical cord shortly after birth?
  • • Have I noticed that my bleeding often starts a day or two after an injury, rather than right away?
  • • Am I feeling overwhelmed by how rare this condition is, and would I like to connect with a patient advocacy group?

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References

  1. 1

    Acquired Factor XIII Deficiency in a 19-year-Old Male Following Ballistic Injury.

    Rodgers SC, Carter KT, Kutcher ME, Iwuchukwu CO

    The American surgeon 2022; (88(9)):2225-2226 doi:10.1177/00031348221091970.

    PMID: 35476509
  2. 2

    Factor XIII deficiency in south of Tunisia.

    Maaloul I, Medhaffer M, Louhichi N, et al.

    Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis 2017; (28(6)):485-489 doi:10.1097/MBC.0000000000000649.

    PMID: 28704210
  3. 3

    Hemorrhagic Shock after Neonatal Circumcision: Severe Congenital Factor XIII Deficiency.

    Cohen EL, Millikan SE, Morocco PC, de Jong JLO

    Case reports in pediatrics 2021; (2021()):5550199 doi:10.1155/2021/5550199.

    PMID: 34007504
  4. 4

    Pyopneumothorax Secondary to Pulmonary Tuberculosis Superadded by Congenital Factor XIII Deficiency: A Case Report.

    Bajpai J, Tewari J, Roy S, et al.

    Cureus 2023; (15(10)):e47350 doi:10.7759/cureus.47350.

    PMID: 38022233
  5. 5

    State of the art in factor XIII laboratory assessment.

    Durda MA, Wolberg AS, Kerlin BA

    Transfusion and apheresis science : official journal of the World Apheresis Association : official journal of the European Society for Haemapheresis 2018; (57(6)):700-704 doi:10.1016/j.transci.2018.07.006.

    PMID: 30087086
  6. 6

    Subgaleal Hematoma in a Female With Normal Coagulation Tests.

    Ataei-Azimi S, Bos MHA, Rahimi H, Mansouritorghabeh H

    Case reports in hematology 2025; (2025()):5481806 doi:10.1155/crh/5481806.

    PMID: 40919234
  7. 7

    Expression of factor XIII originating from synovial fibroblasts and macrophages induced by interleukin-6 signaling.

    Watanabe H, Mokuda S, Tokunaga T, et al.

    Inflammation and regeneration 2023; (43(1)):2 doi:10.1186/s41232-022-00252-4.

    PMID: 36609460
  8. 8

    Successful perinatal management of a woman with congenital factor XIII deficiency using recombinant factor XIII: A case report and literature review.

    Ito Y, Tsuji S, Kasahara M, et al.

    The journal of obstetrics and gynaecology research 2024; (50(2)):262-265 doi:10.1111/jog.15819.

    PMID: 37875278
  9. 9

    Premarital Screening Program for Congenital Factor XIII Deficiency in Iran.

    Daneshi M, Dorgalaleh A, Tabibian S, et al.

    Clinical laboratory 2020; (66(8)) doi:10.7754/Clin.Lab.2020.191133.

    PMID: 32776739
  10. 10

    Recombinant factor XIII prophylaxis is safe and effective in young children with congenital factor XIII-A deficiency: international phase 3b trial results.

    Kerlin BA, Inbal A, Will A, et al.

    Journal of thrombosis and haemostasis : JTH 2017; (15(8)):1601-1606 doi:10.1111/jth.13748.

    PMID: 28581691
  11. 11

    Delayed and prolonged umbilical stump bleeding in a Caucasian newborn as a presenting feature of factor XIII deficiency.

    Lim DBN, Mangles S, Goturu A

    BMJ case reports 2022; (15(10)) doi:10.1136/bcr-2022-248743.

    PMID: 36207057
  12. 12

    The Role of Different Matrixin Gene Expressions on Cerebral Bleeding among Patients with Deficiency of Coagulation Factor XIII.

    Mao L, Huang Y, Jia W, et al.

    Cellular and molecular biology (Noisy-le-Grand, France) 2022; (68(8)):129-132 doi:10.14715/cmb/2022.68.8.23.

    PMID: 36800823
  13. 13

    Congenital factor XIII deficiency caused by F13A1 gene mutations presenting with intracranial hemorrhage: a case report.

    Wang H, Yang R, Li J

    Frontiers in pediatrics 2025; (13()):1732065 doi:10.3389/fped.2025.1732065.

    PMID: 41488895
  14. 14

    Recurrent Intramuscular Hematoma Revealing Moderate Congenital Factor XIII Deficiency.

    Ben Halima N, Riahi S, Mazlout I, et al.

    Cureus 2025; (17(10)):e95841 doi:10.7759/cureus.95841.

    PMID: 41328102
  15. 15

    Abnormally Prolonged Bleeding After an Arthroscopic Knee Reconstruction Because of an Inherited Factor XIII Deficiency: A Case Report.

    Wattakavanich N, Boonrod A, Wanitpongpun C, Tharakulphan S

    JBJS case connector 2021; (11(4)) doi:10.2106/JBJS.CC.21.00419.

    PMID: 35102034
  16. 16

    [A Case of Autoimmune Acquired Factor XIII Deficiency Diagnosed from Recurrent Postoperative Bleeding].

    Takashima Y, Kawanishi H, Kotani S, et al.

    Hinyokika kiyo. Acta urologica Japonica 2023; (69(6)):169-173 doi:10.14989/ActaUrolJap_69_6_169.

    PMID: 37460281
  17. 17

    A case of anti-NPX-2 antibody-positive dermatomyositis resulting in massive haemothorax with acquired factor XIII deficiency.

    Matsuda T, Haga T, Sakaguchi T, et al.

    Modern rheumatology case reports 2023; (8(1)):91-94 doi:10.1093/mrcr/rxad049.

    PMID: 37606624
  18. 18

    Retroperitoneal fibrosis in presence of autoimmune coagulation factor XIII deficiency result in recurrent critical post-operative hemorrhage: a case report and molecular research with new insights.

    Matsushita T, Tachibana M, Nakagawa H, et al.

    Frontiers in immunology 2025; (16()):1591847 doi:10.3389/fimmu.2025.1591847.

    PMID: 40709186
  19. 19

    Developing the First Recombinant Factor XIII for Congenital Factor XIII Deficiency: Clinical Challenges and Successes.

    Carcao M, Fukutake K, Inbal A, et al.

    Seminars in thrombosis and hemostasis 2017; (43(1)):59-68 doi:10.1055/s-0036-1585076.

    PMID: 27556350
  20. 20

    A large case series on surgical outcomes in congenital factor XIII deficiency patients in Iran.

    Naderi M, Haghpanah S, Miri-Aliabad G, et al.

    Journal of thrombosis and haemostasis : JTH 2017; (15(12)):2300-2305 doi:10.1111/jth.13872.

    PMID: 29028293

This guide explains Factor XIII deficiency and diagnostic challenges for educational purposes. A hematologist is the best source for diagnosing and managing this rare bleeding disorder.

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