Final answer:
The test that is collected from patients with a fever of unknown origin to rule out septicemia is a blood culture.
Step-by-step explanation:
The test that is collected from patients with a fever of unknown origin to rule out septicemia is the blood culture. A blood culture is performed by taking a sample of blood from the patient and then culturing it in a controlled environment to check for the presence of bacteria or other pathogens. This test is important for diagnosing septicemia, which is a severe infection that can be life-threatening if not treated promptly.
Learn more about blood culture for ruling out septicemia