Synopsis
Diagnose typical childhood immune thrombocytopenia as an exclusion pattern, grade bleeding rather than treating a platelet number, identify malignancy and systemic mimics, and choose observation, haemostatic support or urgent combined therapy safely.
- Typical childhood ITP is abrupt petechiae and bruising, sometimes mucosal bleeding, in an otherwise well child after a viral illness.
- First-line tests are FBC, repeat count if clumping is possible, reticulocytes and expert blood-film review; typical ITP shows isolated thrombocytopenia with no blasts or fragments.
- Normal examination apart from skin or mucosal bleeding is important: lymphadenopathy, hepatosplenomegaly, bone tenderness or systemic illness is atypical.
- There is no single diagnostic gold-standard test; ITP is a clinical and laboratory diagnosis of exclusion supported by recovery over time.
- Management is driven by bleeding severity and context, not the platelet count alone; even a count below 10 × 10^9/L does not automatically require treatment.
- First-line management for mild or moderate skin-only bleeding is observation, education and planned follow-up rather than medicine.
- Selected severe bleeding can be treated with short-course prednisolone or IV immunoglobulin after senior discussion; IVIG usually raises the count faster.
- Life-threatening haemorrhage needs urgent platelet transfusion together with IVIG and IV corticosteroid because transfused platelets are otherwise rapidly destroyed.
- Avoid aspirin, ibuprofen and other NSAIDs, intramuscular injections and activities with substantial head-injury risk while thrombocytopenia is important.
- Discharge requires reliable caregivers, open access, written head-injury and bleeding advice, school planning and a repeat FBC and film in 7 to 10 days.
Key red flags
Bone pain, weight loss, fever, failure to thrive, lymphadenopathy or hepatosplenomegaly is atypical for ITP and raises concern for leukaemia or systemic disease.
Anaemia or neutropenia not explained by bleeding, or blasts, fragments or dysplasia on film, requires urgent haematology assessment.
A child under 6 months, gradual onset, lifelong bruising or a family history of thrombocytopenia suggests congenital or inherited disease.
Severe headache, drowsiness, vomiting, seizure or neurological deficit may indicate intracranial haemorrhage even after apparently minor head trauma.
Melaena, haematemesis, macroscopic haematuria, heavy menstrual bleeding causing anaemia or epistaxis persisting despite pressure constitutes significant wet bleeding.
Fever, shock, renal impairment, neurological abnormalities or fragmented red cells suggests sepsis, DIC, HUS or TTP rather than isolated ITP.
Investigation priorities
Confirm true thrombocytopenia and determine whether another blood-cell lineage is affected.
Management branches
The child is well with typical isolated thrombocytopenia and no important wet bleeding.
- Confirm the film and absence of atypical clinical features.
- Avoid NSAIDs, intramuscular injections and high-impact activity while risk remains important.
- Discharge only with open access, written red flags, school advice and reliable follow-up.
- Repeat FBC and film in 7 to 10 days and review the evolving diagnosis.