Which finding would be least reliable as a hydration indicator in pediatric patients?

• A. Blood type.
• B. Urine output.
• C. Skin turgor.
• D. Capillary refill.

Answer: (A)

When assessing a child’s hydration, focus on signs that reflect blood flow and how the kidneys are functioning, not fixed traits the body carries. Blood type is genetic and constant; it doesn’t change with fluid status, so it won’t tell you whether a child is dehydrated. In contrast, urine output, skin turgor, and capillary refill are dynamic signs that relate to volume status and perfusion. Urine output helps gauge kidney perfusion and overall fluid balance—low or absent urine points to dehydration. Skin turgor reflects the skin’s elasticity and extracellular fluid volume; reduced turgor can indicate dehydration, though it can be less reliable in very young infants. Capillary refill assesses peripheral perfusion; a longer refill time can signal dehydration or poor circulation, though it can be influenced by temperature and lighting. Thus, blood type is least reliable for hydration assessment.