Hemophilia A
X-Linked Recessive Coagulation Factor Deficiency
Primary risk age: Infants and Toddlers (Often detected during circumcision, or when the child begins crawling/walking)
- Urgency
- Severe
- Typical age
- Infants and Toddlers (Often detected during circumcision, or when the child begins crawling/walking)
- Body system
- Hematological System
Typical course: This is a lifelong genetic coagulation disorder; acute bleeding episodes resolve within days of factor replacement.
Reviewed against AAP · CDC · WHO · NHS guidance Last reviewed 2026-06-13
1. Summary & Pathophysiology
X-Linked Recessive Coagulation Factor Deficiency
Pathophysiology (Development Path)
Factor VIII is a cofactor in the intrinsic pathway of the coagulation cascade. A deficiency of Factor VIII impairs the activation of Factor X, preventing the conversion of prothrombin to thrombin. This results in an inability to form a stable fibrin clot, leading to prolonged bleeding.
Primary Causes & Etiology
A mutation or deletion in the F8 gene on the X chromosome, leading to a deficiency of functional Coagulation Factor VIII.
2. Symptom Continuum
- Early Onset Signs
Prolonged bleeding following circumcision, heel sticks, or minor cuts. Easy bruising on the trunk and limbs when the child begins to crawl.
- Progressive Phase
Hemarthrosis (bleeding into joints, commonly knees, elbows, and ankles), causing sudden joint pain, swelling, warmth, and reluctance to move the limb.
- Severe Indicators
Intramuscular hemorrhages causing compartment syndrome, hematuria, gastrointestinal bleeding, and intracranial hemorrhage following minor head trauma.
3. Clinical Verification
Prolonged Activated Partial Thromboplastin Time (aPTT) with a normal Prothrombin Time (PT) and platelet count. Diagnosis is confirmed by a specific Factor VIII activity assay.
4. Care & Elements Plan
Primary Care Treatment Plan
Prevent and treat bleeding episodes by replacing the deficient Factor VIII. Administer prophylactic infusions of recombinant Factor VIII. Desmopressin (DDAVP) can be used for mild cases.
Home Support Elements
Ensure a safe home environment to minimize trauma (padded furniture corners, protective helmet when learning to walk). Avoid aspirin and NSAIDs. Administer factor replacement at home under clinical guidance.
Generic Active Ingredients (No Brands)
- Recombinant Coagulation Factor VIII (active replacement ingredient)
- Desmopressin acetate (DDAVP - generic active ingredient to stimulate release of stored Factor VIII in mild cases).
Lists active elements only. Never administer self-designed therapies.
5. Doctor Critical Lines
Critical Thresholds: When to See a Doctor
Any head injury, neck injury, or signs of joint bleeding require immediate medical evaluation and factor replacement therapy.
6. Vaccine & Prevention
Routine Prophylaxis (Prevention)
Avoid trauma. Genetic counseling for families with a known history of hemophilia; prenatal diagnosis is available.
Immunization Context
Administer vaccines subcutaneously rather than intramuscularly, and apply firm pressure for at least 5 minutes to prevent hematoma.
7. Timelines & Outlook
Active Timeline
This is a lifelong genetic coagulation disorder; acute bleeding episodes resolve within days of factor replacement.
Expected Prognosis
Good with modern prophylactic factor replacement; children can expect a normal lifespan and active lifestyle, though joint damage remains a risk.
Potential Untreated Complications
Chronic hemophilic arthropathy (joint destruction from repeated bleeds), development of inhibitory antibodies against infused Factor VIII, and blood-borne infections.
