Final answer:
The finding to anticipate in this case is a pH below 7.30.
Step-by-step explanation:
In this scenario, the patient's glucose level of 400 mg/dL along with ketones and fruity odor in their breath indicates a condition called diabetic ketoacidosis (DKA). DKA occurs in individuals with poorly controlled diabetes mellitus, where the body breaks down fatty acids for energy instead of glucose, resulting in the production of ketone bodies. The accumulation of ketone bodies leads to an increase in blood acidity (low pH). Therefore, the finding to anticipate in this case is a pH below 7.30.