Final answer:
Urine of constant SG ranging from 1.008 to 1.010 most likely indicates diabetes insipidus, a condition in which the kidneys are unable to reabsorb enough water resulting in the excretion of large volumes of diluted urine.
Step-by-step explanation:
Urine of constant specific gravity (SG) ranging from 1.008 to 1.010 most likely indicates diabetes insipidus, which is a condition characterized by insufficient release of the antidiuretic hormone (ADH) or insufficient ADH receptors. In diabetes insipidus, the kidneys are unable to reabsorb enough water, resulting in the excretion of large volumes of diluted urine. This condition is different from diabetes mellitus, which is characterized by high blood glucose levels and the presence of glucose in urine.