Final answer:
The laboratory value that might indicate an adverse response to hydrochlorothiazide (HydroDIURIL) is decreased sodium levels (option D).
Step-by-step explanation:
The laboratory value that might indicate an adverse response to hydrochlorothiazide (HydroDIURIL) is decreased sodium levels (option D). Hydrochlorothiazide is a diuretic medication that works by increasing the excretion of water and sodium from the body. If a patient experiences a decrease in their sodium levels while taking hydrochlorothiazide, it could be a sign of an adverse reaction to the medication.