Which of the following tests does not require fasting?

A complete blood count (CBC) does not require fasting because it primarily measures components of the blood, such as red blood cells, white blood cells, and platelets, which are not influenced by recent food intake. This test assesses general health and can help diagnose various conditions without any dietary restrictions prior to the blood draw.

In contrast, other tests such as a lipid panel and a comprehensive metabolic panel typically require fasting to ensure that recent food intake does not affect the results. A glucose tolerance test also necessitates fasting to accurately evaluate how the body handles glucose. Thus, the requirement for fasting depends on the specific parameters being tested, and in the case of a CBC, fasting is unnecessary.