When assessing a dehydrated client, what physical sign should a nurse look for to confirm dehydration?

Identifying dry mucous membranes is a key physical sign in confirming dehydration. In a dehydrated state, the body's fluids are depleted, leading to less moisture in the mucous membranes. This results in a dry sensation in the mouth and throat, which can serve as an easily observable indicator of reduced hydration levels.

In contrast, elevated blood pressure may not be a reliable sign of dehydration, as the relationship between fluid loss and blood pressure can vary, with some patients experiencing hypotension instead. Increased capillary refill time can occur in dehydration but can also be influenced by various other factors, such as peripheral circulation, making it less definitive as a sole sign. Bradycardia, or a slow heart rate, typically does not correlate with dehydration; instead, tachycardia is more commonly observed as a compensatory response to low intravascular volume. Thus, dry mucous membranes serve as a straightforward and effectively recognized indicator of dehydration for nurses during assessment.