G6PD Deficiency Does NOT Cause Easy Bruising in Small Children
G6PD deficiency is not a bleeding disorder and does not cause bruising. This is a critical distinction that must be understood when evaluating a child with unexplained bruising.
Why G6PD Deficiency Does Not Cause Bruising
G6PD deficiency is an X-linked enzymatic disorder affecting red blood cells, making them vulnerable to oxidative damage and hemolysis 1. The condition manifests as:
- Acute hemolytic anemia triggered by oxidative stressors (fava beans, certain drugs like primaquine or rasburicase, infections)
- Neonatal jaundice that can lead to kernicterus 2
- Chronic hemolytic anemia in rare severe variants
- Anemia symptoms during hemolytic crises (pallor, fatigue, dark urine, jaundice)
Notably absent from this clinical picture: bruising or bleeding manifestations. G6PD deficiency does not affect coagulation factors, platelet function, or vascular integrity 1, 3.
What Actually Causes Bruising in Children
When evaluating bruising in small children, the American Academy of Pediatrics guidelines 4 identify the actual bleeding disorders to consider:
Common bleeding disorders that cause bruising:
- Von Willebrand disease (most common hereditary bleeding disorder, affects up to 1% of population) 5
- Immune thrombocytopenia (ITP)
- Factor deficiencies (hemophilia A/B, factor VII, XI deficiencies)
- Platelet function disorders
- Vitamin K deficiency
Initial screening tests for bruising should include:
- Complete blood count with platelet count
- PT (prothrombin time)
- aPTT (activated partial thromboplastin time)
- Consider von Willebrand testing if above normal 4
Critical Clinical Pitfall
Do not confuse G6PD deficiency with bleeding disorders. If a child with known G6PD deficiency presents with bruising, the G6PD deficiency is not the explanation. You must evaluate for:
- Child abuse - the most important consideration in unexplained bruising, especially in non-mobile infants 4
- Actual bleeding disorders - using the screening panel above
- Other medical conditions - Ehlers-Danlos syndrome, scurvy, malignancy 4
The presence of G6PD deficiency does not protect against abuse, nor does it explain bruising. These are separate clinical entities requiring independent evaluation 4.
When to Consider G6PD Deficiency
Test for G6PD deficiency when a child presents with:
- Acute hemolytic anemia (sudden pallor, jaundice, dark urine)
- Severe neonatal jaundice
- Hemolysis after exposure to oxidative triggers
- Family history of G6PD deficiency in populations where it's endemic (African, Mediterranean, Middle Eastern, Asian descent) 1, 2
Bottom line: If bruising is the presenting complaint, G6PD deficiency is not on your differential diagnosis. Focus your evaluation on true bleeding disorders and non-accidental trauma per AAP guidelines 4.