A child with leukemia presents with peteehiae; gums, lips, and nose that bleed easily; and bruising on various parts of her body. Which of the following laboratory test results would the nurse correlate with these findings() A: Platelet count of 80×103/mm3. B: Serum calcium level of 5 mg/dL. C: Fibrinogen level of 75 mg/dL. D: Partial thromboplastin time (PTT) of 38 seconds.