Which assessment finding best supports a nursing diagnosis of Deficient fluid volume, for a male client with hyperglycemia?

Increased urine osmolarity

In hyperglycemia, urine osmolarity (the measurement of dissolved particles in the urine) increases as glucose particles move into the urine. The client experiences glucosuria and polyuria, losing body fluids and experiencing fluid volume deficit. Cool, clammy skin; distended neck veins; and a decreased serum sodium level are signs of fluid volume excess, the opposite imbalance.