Pediatric purpura algorithm*

DIC: disseminated intravascular coagulation; CBC: complete blood count; PT: prothrombin time; aPTT: activated partial thromboplastin time; HSP: Henoch Schoelein purpura; ITP: idiopathic thrombocytopenic purpura; HUS: hemolytic uremic syndrome; TTP: thrombotic thrombocytopenic purpura.
* For more discussion of specific evaluation of children with purpura, please refer to UpToDate topics on purpura in children.
¶ Other vascular causes of purpura include vitamin C deficiency (scurvy), Ehlers-Danlos syndrome, and pigmented purpuric dermatoses (capillaritis).