Review Question - QID 109948

A 27-year-old woman presents to her primary care physician with pain in her hands, shoulders, and knees. The pain has lasted for several months but seems to have worsened recently. Any activity such as opening jars, walking, or brushing her teeth is painful. The patient has a medical history of a suicide attempt in college, constipation, anxiety, depression, and a sunburn associated with surfing which was treated with aloe vera gel. Her temperature is 99.5°F (37.5°C), blood pressure is 137/78 mmHg, pulse is 92/min, respirations are 14/min, and oxygen saturation is 98% on room air. Laboratory values are obtained and shown below.

Hemoglobin: 9 g/dL
Hematocrit: 33%
Leukocyte count: 2,500/mm^3 with normal differential
Platelet count: 107,000/mm^3

Serum:
Na+: 139 mEq/L
Cl-: 102 mEq/L
K+: 4.4 mEq/L
HCO3-: 24 mEq/L
BUN: 21 mg/dL
Glucose: 90 mg/dL
Creatinine: 1.0 mg/dL
Ca2+: 10.2 mg/dL
AST: 12 U/L
ALT: 10 U/L

Which of the following findings is the most likely to be positive in this patient?