Evaluation and Management of Petechiae and Purpura in Infants

Initial Assessment and Laboratory Investigations

The American Academy of Pediatrics recommends assessing for presence and severity of bleeding symptoms beyond petechiae/purpura, evaluating for fever or history of fever, reviewing medication history, and assessing family history of bleeding disorders or thrombotic events in infants with petechiae and purpura 2
The workup for petechiae and purpura in a 4-month-old should include a complete blood count with peripheral blood smear, coagulation studies, and assessment for signs of serious illness, while recognizing that well-appearing infants with localized petechiae often have benign etiologies 1
Hepatosplenomegaly or lymphadenopathy should be assessed in infants with petechiae and purpura, as it may indicate a serious underlying condition 1
Neck stiffness or other meningeal signs should be evaluated in infants with petechiae and purpura, as it may indicate meningitis 4, 5

Meningococcal disease should be considered in infants with fever, petechiae/purpura, and ill appearance, and immediate administration of parenteral antibiotics is recommended 4, 5
Immune thrombocytopenia (ITP) should be considered in infants with petechiae and purpura, and testing for HIV and HCV should be considered in these cases 6
The American Society of Hematology recommends that no routine testing for H. pylori be done in children with ITP 6
Post-vaccination petechiae should be considered in infants with a history of recent immunization 3

Delaying antibiotics in ill-appearing infants with fever and petechiae while awaiting test results should be avoided, as it may lead to serious consequences 4
Failing to recognize that a bone marrow examination is not routinely needed in typical ITP presentation should be avoided, as it may lead to unnecessary procedures 1