Which of the following is NOT considered a vital sign?

Vital signs are key indicators of a person's health status and include measurements such as body temperature, blood pressure, heart rate, and respiratory rate. Each of these plays a crucial role in assessing the functioning of various body systems and identifying potential medical conditions.

Weight, while an important measurement in evaluating health and diagnosing conditions related to obesity or malnutrition, is not classified as a vital sign. Vital signs are specifically those that reflect the body’s immediate physiological state, whereas weight is a more general measure that does not provide real-time information about a patient's current health status. Therefore, weight is the correct answer when identifying what is not considered a vital sign.