Final answer:
In diabetes insipidus, the nurse should expect high urine specific gravity due to the kidneys' inability to concentrate the urine properly.
Step-by-step explanation:
In the case of a client with diabetes insipidus, the nurse should expect to find a high urine specific gravity. Diabetes insipidus is a condition where the kidneys are unable to concentrate urine properly, leading to excessive dilution and increased urine output. In contrast, diabetes mellitus, another type of diabetes, leads to increased blood glucose levels and subsequent increased urine output, but the urine specific gravity is typically low due to the presence of glucose.