Which parameter is least reliable for assessing hydration status in adults?

• A. Mucous membrane moisture
• B. Skin turgor
• C. Weight change
• D. Body temperature

Answer: (B)

When assessing hydration status in adults, some signs are more dependable than others because they are less affected by age, skin condition, or external factors. Skin turgor depends on skin elasticity, which naturally declines with aging and with chronic skin changes, edema, or prolonged sun exposure. That makes the pinch test unreliable in many adults: hydrated individuals can show reduced elasticity, and dehydrated individuals can still have normal skin recoil. In contrast, mucous membrane moisture tends to reflect hydration more consistently, weight change provides an objective metric of fluid loss over time (assuming consistent measurement and accounting for edema), and body temperature is not a direct or reliable indicator of hydration since fever, environment, and other factors can influence it. Therefore, skin turgor is the least reliable parameter for assessing hydration status in adults.