Q. A 63-year-old man with multiple myeloma came to the emergency room with nose bleeding. The IgM multiple myeloma was diagnosed with him six years ago. Since then, he has received several courses of chemotherapy, each associated with a subsequent relapse. The bleeding began four hours ago, and he could not stop it at home. He denies any trauma. He also has some gait instability and somnolence. He has received maintenance chemotherapy for the past eight months. His blood pressure is 128/76 mmHg, and his pulse rate is 89/min. Which of the following would you expect to find in this patient's diagnostic testing?