Question

During a routine kindergarten physical, the physician notes that a 5-year-old boy has grown significantly faster than his peers. His parents report that he has developed axillary hair and adult-like body odor over the last six months. He is otherwise healthy and takes no medications. Vital signs show a blood pressure of $134/86\text{ mm Hg}$ (greater than the 99th percentile for his age and height). Physical examination reveals a muscular habitus and moderate facial acne. Genitourinary examination demonstrates Tanner stage III pubic hair, an enlarged phallus, and bilateral testicular volumes of $2\text{ mL}$. Radiographic imaging of the left wrist indicates a bone age of 9 years, and his serum testosterone is markedly elevated. Which of the following laboratory abnormalities is most likely to be found in this patient?