What does the prefix "hypo-" mean in medical terminology?

The prefix "hypo-" in medical terminology signifies a condition that is below normal or deficient. For instance, when you encounter terms like "hypoglycemia," it refers to lower than normal levels of glucose in the blood. This prefix helps indicate that there is a reduction or deficiency of something compared to a standard level.

In contrast to other options, "above normal or excessive" would simply be indicated by the prefix "hyper-," while "at normal level" and "normal range" do not convey any deficiency or inadequacy. Understanding this prefix is crucial for accurately interpreting medical terms and conditions related to levels of various substances in the body, such as hormones, vitamins, or minerals.