Which measurement is NOT typically used to assess fluid changes in the body?

Fluid balance is an essential aspect of homeostasis in the body, and several measurements are typically used to assess changes in fluid status. Weight is a primary indicator because fluctuations can reflect changes in body fluid volume; an increase may suggest fluid retention, while a decrease can indicate fluid loss. Urine output is another critical measurement, as it provides direct information about kidney function and fluid excretion, helping to monitor hydration status. Urinary frequency can also give insights; increased frequency may indicate conditions like diabetes or other factors influencing fluid regulation.

Blood sugar levels, however, do not directly reflect fluid changes. While they can be influenced by hydration status (for instance, dehydration can elevate blood sugar levels), they are not a reliable metric for assessing fluid volume or changes within the body. Hence, measuring blood sugar levels does not provide specific information regarding the fluid balance, making it the correct choice as a measurement that is not typically used to assess fluid changes.