Final answer:
The best indication of adequate fluid replacement in a client with hypovolemic shock is a urine output greater than 30 mL/h, reflecting sufficient renal perfusion.
Step-by-step explanation:
The best indication that fluid replacement for a client in hypovolemic shock is adequate is A. Urine output greater than 30 mL/h. Hypovolemic shock is marked by a reduction in blood volume, which can be caused by factors such as hemorrhage, severe vomiting, or diarrhea.
The primary treatment for hypovolemic shock is the replacement of fluids, typically via intravenous administration, to restore blood volume and maintain adequate tissue perfusion. When urine output is maintained at greater than 30 mL/h, it reflects that the kidneys are perfused sufficiently and are able to function, thus indicating effective circulatory volume restoration. Other vital signs such as blood pressure and respiratory rate, while also important, are not as direct indicators of renal perfusion.