Final answer:
The nurse should reply, 'The fistula will be usable in about 4 to 6 weeks.'
Step-by-step explanation:
The nurse should reply, c. 'The fistula will be usable in about 4 to 6 weeks.' After having an arteriovenous fistula placed, it takes time for the fistula to heal and mature before it can be used for dialysis.
During the healing process, the fistula develops a strong connection between the artery and vein, allowing for efficient blood flow during dialysis. It is important to wait for the fistula to mature before removing any other catheter or accessing the fistula for dialysis.