Which of the following principles measures the actual coagulation protein rather than fibrin formation?

Your patient is a 49-year-old male complaining of a headache and weakness of his left arm, accompanied by nausea and vomiting. The information that would be most helpful in differentiating a brain abscess from a brain tumor is whether or not the patient:

A) has had a seizure. B) exhibits nuchal rigidity. C) has had a change in the level of responsiveness. D) has a recent history of brain surgery.

A working hypothesis of the nature of a patient's problem is called the:

A) chief complaint. B) field impression. C) history of present illness. D) differential diagnosis.