A nurse is reviewing the laboratory results of a toddler who has hemophilia A. For which of the following results should the nurse anticipate a prescription for the administration of Factor VIII?

Hemophilia A is a hereditary bleeding disorder caused by a deficiency of clotting Factor VIII. Because Factor VIII is part of the intrinsic coagulation pathway, its deficiency results in a prolonged partial thromboplastin time (PTT). The PTT specifically measures the integrity of the intrinsic and common coagulation pathways, and an elevated PTT in a child with hemophilia A reflects the underlying clotting factor deficiency. When a child with hemophilia A has a significantly elevated PTT, particularly in the context of bleeding, the anticipated treatment is replacement of Factor VIII concentrate to restore adequate clotting capability. An elevated erythrocyte sedimentation rate (ESR) indicates inflammation or infection and is not related to hemophilia A management. A decreased platelet count would suggest thrombocytopenia, a different condition; hemophilia A does not affect platelet count, so this result would not trigger Factor VIII administration. A decreased white blood cell count indicates possible immunosuppression or bone marrow problems and similarly has no direct connection to Factor VIII replacement therapy. Understanding that hemophilia A specifically prolongs the PTT through Factor VIII deficiency helps the nurse anticipate appropriate treatment responses and recognize abnormal laboratory trends in this population.