A nurse is collecting data from an adolescent who has diabetes mellitus and is receiving glucagon therapy. Which of the following findings indicates the therapy has been effective?

Choice A reason: Increased alertness may be a sign of improved glucose levels, but it is not as direct an indicator as a blood glucose measurement. Choice B reason: Diaphoresis is a symptom of low blood glucose levels and indicates the need for intervention rather than effectiveness of therapy. Choice C reason: A blood glucose level of 50 mg/dL is within the normal range and indicates that the glucagon therapy has been effective in raising blood glucose levels. Choice D reason: The presence of urine ketones indicates that the body is using fats for energy, which may occur in the absence of adequate glucose. This is not an indicator of the effectiveness of glucagon therapy.